Introduction
Autoimmune hemolytic anemia (AIHA) can rarely be seen as an extra-intestinal manifestation (EIM) of inflammatory bowel disease (IBD), mostly ulcerative colitis (UC). This case report describes the clinical significance of recognizing AIHA in the context of UC.
Case Presentation
A 32-year-old male presented with profound fatigue, pallor, and dyspnea on exertion for one month. He also recalled intermittent bloody diarrhea for two years for which he never sought medical attention. Physical examination was unremarkable except for mid-abdominal tenderness. Labs revealed microcytosis, hemoglobin of 3.8 g/dL, total bilirubin 2.9 mg/ dL, indirect bilirubin of 2.0 mg/dL, LDH 132 U/L alk-p 459 U/L AST 98 U/L ALT 22 U/L. Direct Coombs test was positive suggesting warm AIHA with pan-agglutinin positive on the eluate test. Further testing revealed negative hepatitis and HIV panels and positive fecal calprotectin. CT abdomen and pelvis showed ascites, right pleural effusion and hepatosplenomegaly. Colonoscopy confirmed the diagnosis of ulcerative colitis, with extensive involvement of the colon. Mesalamine was initiated. Hematology was consulted for AIHA, who started the patient on methylprednisone leading to resolution of hemolytic anemia and improvement in gastrointestinal symptoms.
Discussion
IBD typically manifests as colitis, and the incidence of EIM as an initial symptom is observed in less than 10% cases. However, over the course of their lifetime, approximately 25% of patients will experience EIM, underscoring their relevance to clinical outcomes. Anemia is very common in IBD patients, mostly iron deficiency anemia (IDA) or anemia of chronic disease (ACD). However, AIHA can represent a rare but significant EIM of ulcerative colitis (UC), often posing diagnostic challenges. The underlying pathophysiological mechanisms linking UC and AIHA remain incompletely understood, necessitating a multidisciplinary approach to management. Treatment strategies focus on controlling both the hemolysis and the underlying IBD, emphasizing the importance of tailored interventions.
Conclusion
This case underscores the clinical significance of AIHA as an EIM of ulcerative colitis (UC), particularly when presenting as the primary symptom. Timely recognition is paramount to optimizing patient outcomes and preventing disease progression. Further research is warranted to elucidate the underlying mechanisms and therapeutic strategies for AIHA in the context of UC.
