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Neuroendocrine Tumor of Ampulla of Vater: A Rare Case Report and Review of Literature
Background
Ampulla of Vater is an extremely rare site for neuroendocrine tumors (NET), accounting for less than 0.3% of gastrointestinal (GI) and 2% of ampullary malignancies. This case report highlights the circuitous diagnosis of this rare tumor in a patient with a history of primary biliary cholangitis presenting with epigastric pain and severe pruritis.
Case Presentation
A 58-year-old female with history of sarcoidosis and primary biliary cholangitis status post sphincterotomy eight months prior, presented with worsening epigastric pain, fatigue, and weight loss over 6 months. Physical exam showed right upper quadrant tenderness. Labs revealed elevated alanine and aspartate aminotransferases at 415 and 195 units/L, with bilirubin of 0.3 mg/dl. Computerized tomography (CT) revealed a 2.3x3.2x4.0 cm peripancreatic hypodensity associated with phlegmon, pancreatic ductal dilation and pneumobilia. Magnetic resonance imaging (MRI) demonstrated a pancreatic head mass. Positron emission tomogram (PET) was negative for distant metastases. After discussion of management options, patient opted for Whipple procedure. The surgical pathology was consistent with invasive ampullary ductal carcinoma of the small intestine, pancreaticobiliary type. However, staining for synaptophysin and chromogranin were positive, with Ki-67 < 55%. Tumor board review confirmed neuroendocrine tumor of the ampulla of Vater. NCCN guidelines recommended active surveillance due to locoregional disease without positive margins or lymph nodes, advising routine follow-up and imaging.
Discussion
Neuroendocrine tumors (NET) at the Ampulla of Vater are exceedingly rare. Often manifesting as obstructive jaundice, they pose diagnostic hurdles, especially in patients with anatomical variations like scarring from primary biliary cholangitis. In a case series of 20 ampullary tumors, only one was neuroendocrine, highlighting their rarity. Accurate diagnosis, achieved through surgical biopsy and immunohistochemical testing, is crucial for appropriate management. Following NCCN guidelines for gastrointestinal NETs, our patient avoided unnecessary systemic treatment meant for adenocarcinoma, preserving her quality of life. Reporting such cases is essential for advancing understanding and refining patient care.
Conclusions
This case had evolving diagnoses, altering both the prognosis and treatment standards. Comorbid primary biliary cholangitis and high-grade tumor complexity posed diagnostic challenges, which was finally confirmed by surgical biopsy. Reporting such cases is vital in aiding tumor management and patient outcomes.
Background
Ampulla of Vater is an extremely rare site for neuroendocrine tumors (NET), accounting for less than 0.3% of gastrointestinal (GI) and 2% of ampullary malignancies. This case report highlights the circuitous diagnosis of this rare tumor in a patient with a history of primary biliary cholangitis presenting with epigastric pain and severe pruritis.
Case Presentation
A 58-year-old female with history of sarcoidosis and primary biliary cholangitis status post sphincterotomy eight months prior, presented with worsening epigastric pain, fatigue, and weight loss over 6 months. Physical exam showed right upper quadrant tenderness. Labs revealed elevated alanine and aspartate aminotransferases at 415 and 195 units/L, with bilirubin of 0.3 mg/dl. Computerized tomography (CT) revealed a 2.3x3.2x4.0 cm peripancreatic hypodensity associated with phlegmon, pancreatic ductal dilation and pneumobilia. Magnetic resonance imaging (MRI) demonstrated a pancreatic head mass. Positron emission tomogram (PET) was negative for distant metastases. After discussion of management options, patient opted for Whipple procedure. The surgical pathology was consistent with invasive ampullary ductal carcinoma of the small intestine, pancreaticobiliary type. However, staining for synaptophysin and chromogranin were positive, with Ki-67 < 55%. Tumor board review confirmed neuroendocrine tumor of the ampulla of Vater. NCCN guidelines recommended active surveillance due to locoregional disease without positive margins or lymph nodes, advising routine follow-up and imaging.
Discussion
Neuroendocrine tumors (NET) at the Ampulla of Vater are exceedingly rare. Often manifesting as obstructive jaundice, they pose diagnostic hurdles, especially in patients with anatomical variations like scarring from primary biliary cholangitis. In a case series of 20 ampullary tumors, only one was neuroendocrine, highlighting their rarity. Accurate diagnosis, achieved through surgical biopsy and immunohistochemical testing, is crucial for appropriate management. Following NCCN guidelines for gastrointestinal NETs, our patient avoided unnecessary systemic treatment meant for adenocarcinoma, preserving her quality of life. Reporting such cases is essential for advancing understanding and refining patient care.
Conclusions
This case had evolving diagnoses, altering both the prognosis and treatment standards. Comorbid primary biliary cholangitis and high-grade tumor complexity posed diagnostic challenges, which was finally confirmed by surgical biopsy. Reporting such cases is vital in aiding tumor management and patient outcomes.
Background
Ampulla of Vater is an extremely rare site for neuroendocrine tumors (NET), accounting for less than 0.3% of gastrointestinal (GI) and 2% of ampullary malignancies. This case report highlights the circuitous diagnosis of this rare tumor in a patient with a history of primary biliary cholangitis presenting with epigastric pain and severe pruritis.
Case Presentation
A 58-year-old female with history of sarcoidosis and primary biliary cholangitis status post sphincterotomy eight months prior, presented with worsening epigastric pain, fatigue, and weight loss over 6 months. Physical exam showed right upper quadrant tenderness. Labs revealed elevated alanine and aspartate aminotransferases at 415 and 195 units/L, with bilirubin of 0.3 mg/dl. Computerized tomography (CT) revealed a 2.3x3.2x4.0 cm peripancreatic hypodensity associated with phlegmon, pancreatic ductal dilation and pneumobilia. Magnetic resonance imaging (MRI) demonstrated a pancreatic head mass. Positron emission tomogram (PET) was negative for distant metastases. After discussion of management options, patient opted for Whipple procedure. The surgical pathology was consistent with invasive ampullary ductal carcinoma of the small intestine, pancreaticobiliary type. However, staining for synaptophysin and chromogranin were positive, with Ki-67 < 55%. Tumor board review confirmed neuroendocrine tumor of the ampulla of Vater. NCCN guidelines recommended active surveillance due to locoregional disease without positive margins or lymph nodes, advising routine follow-up and imaging.
Discussion
Neuroendocrine tumors (NET) at the Ampulla of Vater are exceedingly rare. Often manifesting as obstructive jaundice, they pose diagnostic hurdles, especially in patients with anatomical variations like scarring from primary biliary cholangitis. In a case series of 20 ampullary tumors, only one was neuroendocrine, highlighting their rarity. Accurate diagnosis, achieved through surgical biopsy and immunohistochemical testing, is crucial for appropriate management. Following NCCN guidelines for gastrointestinal NETs, our patient avoided unnecessary systemic treatment meant for adenocarcinoma, preserving her quality of life. Reporting such cases is essential for advancing understanding and refining patient care.
Conclusions
This case had evolving diagnoses, altering both the prognosis and treatment standards. Comorbid primary biliary cholangitis and high-grade tumor complexity posed diagnostic challenges, which was finally confirmed by surgical biopsy. Reporting such cases is vital in aiding tumor management and patient outcomes.
Laterality in Renal Cancer: Effect on Survival in Veteran Population
Background
Kidney and renal pelvis cancers (KC) represent 4% of new cancer cases in the US. Although it is a common cancer, there is no data to compare the effect of laterality on survival in veteran population. In this abstract, we attempt to bridge this gap and compare the effect of laterality on survival.
Methods
We obtained data from Albany VA (VAMC) for patients diagnosed with KC between 2010-2020. Data were analyzed for age, stage at diagnosis, histopathological type, laterality of tumor, and 6,12 and 60-months survival after the diagnosis and performed a comparison of overall survival of left versus rightsided cancer by calculating odds ratio using logistic regression, significance level was established at p< 0.05.
Results
We reviewed 130 patients diagnosed with KC at VAMC. 62 had right-sided, 62 had left-sided, and 6 had bilateral cancer. Clear cell (40.8%) was predominant type. Other less common histopathological types include Papillary RCC, mixed, papillary urothelial and transitional types. 58 patients had stage 1 (28 right versus 30 left), 8 had stage 2 (5 versus 3), 29 had stage 3 (13 versus 16), 16 with stage 4 (12 versus 4), and 14 had stage 0 (papillary-urothelial). 59.2% patients underwent surgical treatment after diagnosis (R=35, L=39). At 6-months, 60 patients (96.8%) with left-sided and 53 (85.5%) with right-sided cancer survived. The odds of surviving 6-months were 12% higher (95% CI: 1.014, 1.236; p=0.03) in left versus right-sided cancer. For 1-year survival, the results were similar. 111 patients completed a 5-year follow-up and there was no evidence to support a difference in survival between cohorts at 5-years: OR (95% CI: 0.88, 1.47; p=0.32).
Conclusions
In this study, we discovered that leftsided cancer showed better survival at 6-months and 1-year compared to right-sided cancer, but 5-year survival rates appeared similar irrespective of laterality of cancer. Both subgroups had similar distribution for baseline characteristics with majority of patients being males, older than 60 years, with stage 1 disease. Further studies in larger populations with wider distribution of baseline characteristics are needed to establish clear role of laterality as a prognostic factor.
Background
Kidney and renal pelvis cancers (KC) represent 4% of new cancer cases in the US. Although it is a common cancer, there is no data to compare the effect of laterality on survival in veteran population. In this abstract, we attempt to bridge this gap and compare the effect of laterality on survival.
Methods
We obtained data from Albany VA (VAMC) for patients diagnosed with KC between 2010-2020. Data were analyzed for age, stage at diagnosis, histopathological type, laterality of tumor, and 6,12 and 60-months survival after the diagnosis and performed a comparison of overall survival of left versus rightsided cancer by calculating odds ratio using logistic regression, significance level was established at p< 0.05.
Results
We reviewed 130 patients diagnosed with KC at VAMC. 62 had right-sided, 62 had left-sided, and 6 had bilateral cancer. Clear cell (40.8%) was predominant type. Other less common histopathological types include Papillary RCC, mixed, papillary urothelial and transitional types. 58 patients had stage 1 (28 right versus 30 left), 8 had stage 2 (5 versus 3), 29 had stage 3 (13 versus 16), 16 with stage 4 (12 versus 4), and 14 had stage 0 (papillary-urothelial). 59.2% patients underwent surgical treatment after diagnosis (R=35, L=39). At 6-months, 60 patients (96.8%) with left-sided and 53 (85.5%) with right-sided cancer survived. The odds of surviving 6-months were 12% higher (95% CI: 1.014, 1.236; p=0.03) in left versus right-sided cancer. For 1-year survival, the results were similar. 111 patients completed a 5-year follow-up and there was no evidence to support a difference in survival between cohorts at 5-years: OR (95% CI: 0.88, 1.47; p=0.32).
Conclusions
In this study, we discovered that leftsided cancer showed better survival at 6-months and 1-year compared to right-sided cancer, but 5-year survival rates appeared similar irrespective of laterality of cancer. Both subgroups had similar distribution for baseline characteristics with majority of patients being males, older than 60 years, with stage 1 disease. Further studies in larger populations with wider distribution of baseline characteristics are needed to establish clear role of laterality as a prognostic factor.
Background
Kidney and renal pelvis cancers (KC) represent 4% of new cancer cases in the US. Although it is a common cancer, there is no data to compare the effect of laterality on survival in veteran population. In this abstract, we attempt to bridge this gap and compare the effect of laterality on survival.
Methods
We obtained data from Albany VA (VAMC) for patients diagnosed with KC between 2010-2020. Data were analyzed for age, stage at diagnosis, histopathological type, laterality of tumor, and 6,12 and 60-months survival after the diagnosis and performed a comparison of overall survival of left versus rightsided cancer by calculating odds ratio using logistic regression, significance level was established at p< 0.05.
Results
We reviewed 130 patients diagnosed with KC at VAMC. 62 had right-sided, 62 had left-sided, and 6 had bilateral cancer. Clear cell (40.8%) was predominant type. Other less common histopathological types include Papillary RCC, mixed, papillary urothelial and transitional types. 58 patients had stage 1 (28 right versus 30 left), 8 had stage 2 (5 versus 3), 29 had stage 3 (13 versus 16), 16 with stage 4 (12 versus 4), and 14 had stage 0 (papillary-urothelial). 59.2% patients underwent surgical treatment after diagnosis (R=35, L=39). At 6-months, 60 patients (96.8%) with left-sided and 53 (85.5%) with right-sided cancer survived. The odds of surviving 6-months were 12% higher (95% CI: 1.014, 1.236; p=0.03) in left versus right-sided cancer. For 1-year survival, the results were similar. 111 patients completed a 5-year follow-up and there was no evidence to support a difference in survival between cohorts at 5-years: OR (95% CI: 0.88, 1.47; p=0.32).
Conclusions
In this study, we discovered that leftsided cancer showed better survival at 6-months and 1-year compared to right-sided cancer, but 5-year survival rates appeared similar irrespective of laterality of cancer. Both subgroups had similar distribution for baseline characteristics with majority of patients being males, older than 60 years, with stage 1 disease. Further studies in larger populations with wider distribution of baseline characteristics are needed to establish clear role of laterality as a prognostic factor.
Does Gemcitabine Have a Curative Role in Treatment of Relapsed/Refractory Chronic Lymphocytic Leukemia?
INTRODUCTION
Gemcitabine is a part of National Comprehensive Cancer Network (NCCN) guidelines as salvage therapy for relapsed/refractory B-cell lymphomas, but its role in chronic lymphocytic leukemia (CLL) remains unclear. We describe a case of relapsed CLL showing complete response while on gemcitabine for another primary malignancy, suggesting a potential curative role of gemcitabine for CLL.
CASE REPORT
A 78-year-old male with relapsed CD38+ CLL with del11q on ibrutinib with partial response, presented with gross hematuria for one week. Of note, he was diagnosed with BRCA-negative Stage Ib pancreatic adenocarcinoma within the previous year, treated with surgery and adjuvant capecitabine-gemcitabine. Physical examination was unremarkable and bloodwork showed a white cell count of 32,000 cells/ mm3 with 1.5% lymphocytes, hemoglobin 9.5 g/dL, and platelets 866,000 cells/mm3. Hematuria remained persistent despite frequent bladder irrigations but resolved within a week of stopping ibrutinib. Eight months later, his white cell count is 6,600 cells/mm3, with 16% lymphocytes, hemoglobin 10.2 g/dL, platelets 519,000/m3, and CT scans show no pathological lymphadenopathy. A recent flow cytometry done for academic purposes showed no clonal B cells.
DISCUSSION
Relapsed CLL has a poor prognosis with no curative treatment. Gemcitabine is a part of NCCN guidelines for relapse/refractory B-cell lymphomas but is not included in guidelines for CLL. A study by Jamie et al in 2001 suggested the pre-clinical effectiveness of gemcitabine for relapsed/refractory CLL and phase II trials conducted in 2005 and 2012 on combination chemotherapy including gemcitabine have shown overall CLL response rates of 50-65%. The resolution of B-cell clonality and improvement in biochemical markers after treatment with gemcitabine for an alternate primary malignancy suggested that gemcitabine played a potential curative role in our patient. Further prospective studies are needed to explore this avenue for the role of gemcitabine as a salvage as well as potentially curative therapy for relapsed CLL with variable cytogenetics and treatment histories.
CONCLUSIONS
Gemcitabine is not part of NCCN guidelines for CLL currently but it is a reasonable treatment option for relapsed/refractory CLL. Further studies are needed to explore its potential curative role for relapsed CLL, and update existing guidelines.
INTRODUCTION
Gemcitabine is a part of National Comprehensive Cancer Network (NCCN) guidelines as salvage therapy for relapsed/refractory B-cell lymphomas, but its role in chronic lymphocytic leukemia (CLL) remains unclear. We describe a case of relapsed CLL showing complete response while on gemcitabine for another primary malignancy, suggesting a potential curative role of gemcitabine for CLL.
CASE REPORT
A 78-year-old male with relapsed CD38+ CLL with del11q on ibrutinib with partial response, presented with gross hematuria for one week. Of note, he was diagnosed with BRCA-negative Stage Ib pancreatic adenocarcinoma within the previous year, treated with surgery and adjuvant capecitabine-gemcitabine. Physical examination was unremarkable and bloodwork showed a white cell count of 32,000 cells/ mm3 with 1.5% lymphocytes, hemoglobin 9.5 g/dL, and platelets 866,000 cells/mm3. Hematuria remained persistent despite frequent bladder irrigations but resolved within a week of stopping ibrutinib. Eight months later, his white cell count is 6,600 cells/mm3, with 16% lymphocytes, hemoglobin 10.2 g/dL, platelets 519,000/m3, and CT scans show no pathological lymphadenopathy. A recent flow cytometry done for academic purposes showed no clonal B cells.
DISCUSSION
Relapsed CLL has a poor prognosis with no curative treatment. Gemcitabine is a part of NCCN guidelines for relapse/refractory B-cell lymphomas but is not included in guidelines for CLL. A study by Jamie et al in 2001 suggested the pre-clinical effectiveness of gemcitabine for relapsed/refractory CLL and phase II trials conducted in 2005 and 2012 on combination chemotherapy including gemcitabine have shown overall CLL response rates of 50-65%. The resolution of B-cell clonality and improvement in biochemical markers after treatment with gemcitabine for an alternate primary malignancy suggested that gemcitabine played a potential curative role in our patient. Further prospective studies are needed to explore this avenue for the role of gemcitabine as a salvage as well as potentially curative therapy for relapsed CLL with variable cytogenetics and treatment histories.
CONCLUSIONS
Gemcitabine is not part of NCCN guidelines for CLL currently but it is a reasonable treatment option for relapsed/refractory CLL. Further studies are needed to explore its potential curative role for relapsed CLL, and update existing guidelines.
INTRODUCTION
Gemcitabine is a part of National Comprehensive Cancer Network (NCCN) guidelines as salvage therapy for relapsed/refractory B-cell lymphomas, but its role in chronic lymphocytic leukemia (CLL) remains unclear. We describe a case of relapsed CLL showing complete response while on gemcitabine for another primary malignancy, suggesting a potential curative role of gemcitabine for CLL.
CASE REPORT
A 78-year-old male with relapsed CD38+ CLL with del11q on ibrutinib with partial response, presented with gross hematuria for one week. Of note, he was diagnosed with BRCA-negative Stage Ib pancreatic adenocarcinoma within the previous year, treated with surgery and adjuvant capecitabine-gemcitabine. Physical examination was unremarkable and bloodwork showed a white cell count of 32,000 cells/ mm3 with 1.5% lymphocytes, hemoglobin 9.5 g/dL, and platelets 866,000 cells/mm3. Hematuria remained persistent despite frequent bladder irrigations but resolved within a week of stopping ibrutinib. Eight months later, his white cell count is 6,600 cells/mm3, with 16% lymphocytes, hemoglobin 10.2 g/dL, platelets 519,000/m3, and CT scans show no pathological lymphadenopathy. A recent flow cytometry done for academic purposes showed no clonal B cells.
DISCUSSION
Relapsed CLL has a poor prognosis with no curative treatment. Gemcitabine is a part of NCCN guidelines for relapse/refractory B-cell lymphomas but is not included in guidelines for CLL. A study by Jamie et al in 2001 suggested the pre-clinical effectiveness of gemcitabine for relapsed/refractory CLL and phase II trials conducted in 2005 and 2012 on combination chemotherapy including gemcitabine have shown overall CLL response rates of 50-65%. The resolution of B-cell clonality and improvement in biochemical markers after treatment with gemcitabine for an alternate primary malignancy suggested that gemcitabine played a potential curative role in our patient. Further prospective studies are needed to explore this avenue for the role of gemcitabine as a salvage as well as potentially curative therapy for relapsed CLL with variable cytogenetics and treatment histories.
CONCLUSIONS
Gemcitabine is not part of NCCN guidelines for CLL currently but it is a reasonable treatment option for relapsed/refractory CLL. Further studies are needed to explore its potential curative role for relapsed CLL, and update existing guidelines.
A Rare Case of Leptomeningeal Carcinomatosis From Gastroesophageal Adenocarcinoma Masquerading as Polyneuropathy
INTRODUCTION
Leptomeningeal metastasis (LM) is an extremely rare complication of gastroesophageal (GE) cancer. Diagnosis is challenging due to frequently nonspecific clinical presentations, limited sensitivity of diagnostic testing, and potential overlap with neurologic immune-related adverse events (irAE). We describe a case of metastatic gastroesophageal cancer on immunotherapy presenting with LM masquerading as polyneuropathy.
CASE REPORT
A 74-year-old male with HER2+ GE junction cancer with peritoneal metastases diagnosed 6 months ago, on maintenance trastuzumab/pembrolizumab and with no previous history of cranial or spinal disease, presented with worsening ataxia, headache, and diplopia for one month with multiple negative outpatient MRIs. Examination showed left abducens nerve palsy, dysmetria and absent deep tendon reflexes in upper and lower extremities. CT head was unremarkable, and MRI showed non-specific mild enhancement of the right optic nerve, symmetrical lumbosacral nerve roots and cauda equina concerning for paraneoplastic versus immunotherapy-related polyneuropathy. He was started on empiric high-dose corticosteroids. PET-CT was negative for FDG-avid lesions. Cerebrospinal fluid (CSF) analysis revealed moderate pleocytosis with many large atypical cells, elevated protein (118 mg/dL) and LDH (28 IU/L). Immunohistochemistry was positive for CDX2, CA 19-9, CK7, and pankeratin, consistent with metastatic adenocarcinoma, negative for HER2 in contrast to the original tumor. He subsequently developed hydrocephalus requiring a ventriculoperitoneal shunt. He received ten fractions of whole brain irradiation before electing to pursue hospice care.
DISCUSSION
LM is an extremely rare complication of GE cancer with an incidence of <0.2% and carries a poor prognosis. Differentiation between LM and irAE in patients on immunotherapy can be challenging. Diagnosis relies mostly on CSF cytology, and lumbar puncture should not be delayed in patients with new neurologic symptoms. Treatment options are intrathecal chemotherapy, radiation and steroids. A recent phase II trial has shown promise for intrathecal trastuzumab in patients with HER2+ cancers, but options for HER2 negative disease remain mostly palliative.
CONCLUSIONS
Our case highlights the need for suspecting this rare metastatic site, as early diagnosis and genetic characterization allow for exploring more treatment options including targeted therapies which may improve overall survival and quality of life.
INTRODUCTION
Leptomeningeal metastasis (LM) is an extremely rare complication of gastroesophageal (GE) cancer. Diagnosis is challenging due to frequently nonspecific clinical presentations, limited sensitivity of diagnostic testing, and potential overlap with neurologic immune-related adverse events (irAE). We describe a case of metastatic gastroesophageal cancer on immunotherapy presenting with LM masquerading as polyneuropathy.
CASE REPORT
A 74-year-old male with HER2+ GE junction cancer with peritoneal metastases diagnosed 6 months ago, on maintenance trastuzumab/pembrolizumab and with no previous history of cranial or spinal disease, presented with worsening ataxia, headache, and diplopia for one month with multiple negative outpatient MRIs. Examination showed left abducens nerve palsy, dysmetria and absent deep tendon reflexes in upper and lower extremities. CT head was unremarkable, and MRI showed non-specific mild enhancement of the right optic nerve, symmetrical lumbosacral nerve roots and cauda equina concerning for paraneoplastic versus immunotherapy-related polyneuropathy. He was started on empiric high-dose corticosteroids. PET-CT was negative for FDG-avid lesions. Cerebrospinal fluid (CSF) analysis revealed moderate pleocytosis with many large atypical cells, elevated protein (118 mg/dL) and LDH (28 IU/L). Immunohistochemistry was positive for CDX2, CA 19-9, CK7, and pankeratin, consistent with metastatic adenocarcinoma, negative for HER2 in contrast to the original tumor. He subsequently developed hydrocephalus requiring a ventriculoperitoneal shunt. He received ten fractions of whole brain irradiation before electing to pursue hospice care.
DISCUSSION
LM is an extremely rare complication of GE cancer with an incidence of <0.2% and carries a poor prognosis. Differentiation between LM and irAE in patients on immunotherapy can be challenging. Diagnosis relies mostly on CSF cytology, and lumbar puncture should not be delayed in patients with new neurologic symptoms. Treatment options are intrathecal chemotherapy, radiation and steroids. A recent phase II trial has shown promise for intrathecal trastuzumab in patients with HER2+ cancers, but options for HER2 negative disease remain mostly palliative.
CONCLUSIONS
Our case highlights the need for suspecting this rare metastatic site, as early diagnosis and genetic characterization allow for exploring more treatment options including targeted therapies which may improve overall survival and quality of life.
INTRODUCTION
Leptomeningeal metastasis (LM) is an extremely rare complication of gastroesophageal (GE) cancer. Diagnosis is challenging due to frequently nonspecific clinical presentations, limited sensitivity of diagnostic testing, and potential overlap with neurologic immune-related adverse events (irAE). We describe a case of metastatic gastroesophageal cancer on immunotherapy presenting with LM masquerading as polyneuropathy.
CASE REPORT
A 74-year-old male with HER2+ GE junction cancer with peritoneal metastases diagnosed 6 months ago, on maintenance trastuzumab/pembrolizumab and with no previous history of cranial or spinal disease, presented with worsening ataxia, headache, and diplopia for one month with multiple negative outpatient MRIs. Examination showed left abducens nerve palsy, dysmetria and absent deep tendon reflexes in upper and lower extremities. CT head was unremarkable, and MRI showed non-specific mild enhancement of the right optic nerve, symmetrical lumbosacral nerve roots and cauda equina concerning for paraneoplastic versus immunotherapy-related polyneuropathy. He was started on empiric high-dose corticosteroids. PET-CT was negative for FDG-avid lesions. Cerebrospinal fluid (CSF) analysis revealed moderate pleocytosis with many large atypical cells, elevated protein (118 mg/dL) and LDH (28 IU/L). Immunohistochemistry was positive for CDX2, CA 19-9, CK7, and pankeratin, consistent with metastatic adenocarcinoma, negative for HER2 in contrast to the original tumor. He subsequently developed hydrocephalus requiring a ventriculoperitoneal shunt. He received ten fractions of whole brain irradiation before electing to pursue hospice care.
DISCUSSION
LM is an extremely rare complication of GE cancer with an incidence of <0.2% and carries a poor prognosis. Differentiation between LM and irAE in patients on immunotherapy can be challenging. Diagnosis relies mostly on CSF cytology, and lumbar puncture should not be delayed in patients with new neurologic symptoms. Treatment options are intrathecal chemotherapy, radiation and steroids. A recent phase II trial has shown promise for intrathecal trastuzumab in patients with HER2+ cancers, but options for HER2 negative disease remain mostly palliative.
CONCLUSIONS
Our case highlights the need for suspecting this rare metastatic site, as early diagnosis and genetic characterization allow for exploring more treatment options including targeted therapies which may improve overall survival and quality of life.