Eccrine Angiomatous Hamartoma: A Case Report and Review of the Literature

Eccrine angiomatous hamartoma (EAH) is a benign and uncommon malformation, characterized by increased numbers of eccrine (sweat) glands and numerous capillary channels. It is usually congenital or arises during the prepubertal years; the lesion only rarely presents during adulthood. The color of EAH may be flesh colored, blue-brown, or reddish and may occur as a nodule, plaque, or, less commonly, a macule. In most cases, EAH arises as a single lesion on the extremity, though reports of multiple lesions and those occurring in more unusual sites exist. The symptoms most commonly associated with EAH are pain and hyperhidrosis; enlargement may occur and is usually in concordance with the growth of the patient. It is important to recognize the hamartoma as a benign clinical entity, for which aggressive management is not necessary. In this article, we report a case of EAH occurring in a young girl, and we review 41 well-documented cases in the literature. 

CASE REPORT

A 12-year-old previously healthy Hispanic girl presented with a lesion on the posterior aspect of her left lower leg. She reported that the lesion had been present since approximately 4 years of age. The patient denied spontaneous pain but described increased perspiration associated with the lesion, including occasions when she noted wet spots on her clothing overlying the area. Findings from the physical examination revealed a 6x5-cm, flesh-colored, palpable tumor in the left calf. Secretion of a clear fluid could be seen originating from the surface of the tumor, and hypertrichosis was present (Figures 1 and 2). A 4-mm punch biopsy of the mass was performed, and results confirmed the diagnosis of EAH (Figure 3). Results of histopathologic examination revealed an unremarkable epidermis. An increased number of sweat glands and terminal hair follicles were found in the dermis, and dilated sweat ducts were noted in the papillary dermis. In addition, large dilated blood vessels were seen in the deep dermis and subcutaneous tissue. Intercellular mucin also was present in the dermal stroma. The constellation of clinical and pathologic features was consistent with the diagnosis of EAH.

The patient declined further diagnostic radiographic evaluation and surgical treatment. She was treated symptomatically for the hypertrichosis and hyperhidrosis, using 13.9% eflornithine cream and topical aluminum chloride, respectively.

Comment

EAH is a rare, benign cutaneous hamartoma consisting of a proliferation of both eccrine glands and thin-walled vascular channels. First described by Lotzbeck in 18591 as an angiomatous-appearing lesion on the cheek of a child, the term EAH was coined by Hyman and coworkers2 in 1968. Since hyperhidrosis is a relatively common finding associated with this condition, various other terms have been used to describe this entity, including sudoriparous angioma3 and functioning sudoriparous angiomatous hamartoma.4 In addition to presenting an additional case of EAH, we review the other 41 cases of EAH reported in the literature (Table 1).

Typically, EAH presents as a solitary, flesh-colored, blue-brown, or reddish papule, plaque, or nodule. However, unusual morphologic variants exist and include hyperkeratotic5 and verrucous6 lesions. There appears to be no gender predilection, and the male-female ratio in the data analyzed was 1:1.1. EAH usually occurs as a solitary lesion, but cases with multiple lesions have been reported and account for approximately 26% of all cases in the literature.3,7-13 The hamartoma often appears at birth2,3,6,9,10,13-22,25 or during early childhood,7,8,16,22-24 as in the present case. In the cases reviewed that were not congenital, the mean age at the time of diagnosis was approximately 21 years, and the range was between 2 months and 73 years. EAH occurs most frequently on the acral areas and, in our review, approximately 74% of all reported lesions were limited to the extremities. However, lesions also have been reported in the sacral region,26 on the buttocks,5,19 face,9 chest,8,13,15,24 or diffusely over multiple anatomic sites.12 EAH is usually asymptomatic, but the most commonly associated symptoms are pain and hyperhidrosis reported in approximately 42% and 32% of all cases analyzed, respectively, including the present case. Approximately 17% of patients with EAH reported both pain and hyperhidrosis (sweating) simultaneously (Table 2). It is postulated that infiltration of small nerves may be responsible for the pain,27,28 and a local increase in the temperature within the angioma may produce the sweating seen in the eccrine component of the hamartoma.3,8,16,27

The diagnosis of EAH is confirmed by histology because the clinical features of the lesion are nonspecific and variable. Histologically, EAH is characterized by a dermal proliferation of well-differentiated eccrine secretory and ductal elements closely associated with thin-walled angiomatous channels. In addition to these defining elements, unusual histopathologic variants have been reported and include the infiltration of adipose tissue,11,16,29 the presence of pilar structures,6,9,11,21 apocrine glands,8 and, as in our case, increased dermal mucin.11 The epidermis typically is unremarkable but may exhibit hyperkeratosis, acanthosis, and papillomatosis.5,6 Immunohistochemical analyses using carcinoembryonic antigen and S-100 have demonstrated no difference between normal eccrine glands and those found in the hamartoma.8,10,16 In addition, ulex europaeus, CD34, CD44, and factor VIII–related antigens are expressed by the endothelial cells within the vascular component of the lesion.8,15,16 These findings help support a hamartomatous rather than tumoral origin for EAH. In addition, cytologic atypia and mitotic figures have not been reported.9,29

Imaging modalities, such as magnetic resonance imaging and ultrasound, are beginning to be used in the evaluation of EAH. One group of investigators reports that ultrasonography of a biopsy-proven EAH revealed varicose veins in cutaneous and subcutaneous layers but could not determine the size or shape of the lesion.30 Now, radiographic imaging may help confirm the clinical suspicion of an angiomatous lesion, but accurate diagnosis of EAH remains with histology.

The etiology of EAH has not been delineated clearly. Zeller and Goldman6 report that the hamartoma may be caused by abnormal induction of heterotypic dependency during organogenesis. According to this model, altered chemical interactions between the differentiating epithelium and mesenchyme result in the hamartomatous growth of these elements, generating an abnormal proliferation of vascular and eccrine structures.

The differential diagnosis of EAH includes eccrine nevus,32 a rare lesion composed of mature eccrine glands capable of producing localized hyperhidrosis. In addition, localized hyperhidrosis may be seen in a variety of other conditions, including neuritis, myelitis, syringomyelia, general paresis, and tabes dorsalis.32 However, these conditions do not produce cutaneous lesions or histologic abnormalities of eccrine glands. Localized hyperhidrosis also may accompany the blue rubber-bleb nevus syndrome, but histology may distinguish EAH from this disorder. Likewise, EAH clinically may resemble tufted angioma, macular telangiectatic mastocytosis, nevus flammeus, glomus tumor, and smooth muscle hamartoma.9,22,25 These conditions are readily differentiated by histologic analysis.

EAH is a benign and typically slow-growing lesion, though a rapid increase in size was noted in one pregnant woman, indicating that it may be under hormonal influence.31 In this case, partial amputation of the involved finger was necessary to relieve the patient's intractable pain. In general, however, aggressive treatment of EAH is unwarranted. Simple excision usually is curative and reserved for painful or cosmetically unacceptable lesions. One study reports no evidence of recurrent disease 15 months after excision.17 Indeed, the pain associated with EAH may remit spontaneously without treatment, even after several years.28 

Eccrine angiomatous hamartoma (EAH) is a benign and uncommon malformation, characterized by increased numbers of eccrine (sweat) glands and numerous capillary channels. It is usually congenital or arises during the prepubertal years; the lesion only rarely presents during adulthood. The color of EAH may be flesh colored, blue-brown, or reddish and may occur as a nodule, plaque, or, less commonly, a macule. In most cases, EAH arises as a single lesion on the extremity, though reports of multiple lesions and those occurring in more unusual sites exist. The symptoms most commonly associated with EAH are pain and hyperhidrosis; enlargement may occur and is usually in concordance with the growth of the patient. It is important to recognize the hamartoma as a benign clinical entity, for which aggressive management is not necessary. In this article, we report a case of EAH occurring in a young girl, and we review 41 well-documented cases in the literature. 

CASE REPORT

A 12-year-old previously healthy Hispanic girl presented with a lesion on the posterior aspect of her left lower leg. She reported that the lesion had been present since approximately 4 years of age. The patient denied spontaneous pain but described increased perspiration associated with the lesion, including occasions when she noted wet spots on her clothing overlying the area. Findings from the physical examination revealed a 6x5-cm, flesh-colored, palpable tumor in the left calf. Secretion of a clear fluid could be seen originating from the surface of the tumor, and hypertrichosis was present (Figures 1 and 2). A 4-mm punch biopsy of the mass was performed, and results confirmed the diagnosis of EAH (Figure 3). Results of histopathologic examination revealed an unremarkable epidermis. An increased number of sweat glands and terminal hair follicles were found in the dermis, and dilated sweat ducts were noted in the papillary dermis. In addition, large dilated blood vessels were seen in the deep dermis and subcutaneous tissue. Intercellular mucin also was present in the dermal stroma. The constellation of clinical and pathologic features was consistent with the diagnosis of EAH.

The patient declined further diagnostic radiographic evaluation and surgical treatment. She was treated symptomatically for the hypertrichosis and hyperhidrosis, using 13.9% eflornithine cream and topical aluminum chloride, respectively.

Comment

EAH is a rare, benign cutaneous hamartoma consisting of a proliferation of both eccrine glands and thin-walled vascular channels. First described by Lotzbeck in 18591 as an angiomatous-appearing lesion on the cheek of a child, the term EAH was coined by Hyman and coworkers2 in 1968. Since hyperhidrosis is a relatively common finding associated with this condition, various other terms have been used to describe this entity, including sudoriparous angioma3 and functioning sudoriparous angiomatous hamartoma.4 In addition to presenting an additional case of EAH, we review the other 41 cases of EAH reported in the literature (Table 1).

Typically, EAH presents as a solitary, flesh-colored, blue-brown, or reddish papule, plaque, or nodule. However, unusual morphologic variants exist and include hyperkeratotic5 and verrucous6 lesions. There appears to be no gender predilection, and the male-female ratio in the data analyzed was 1:1.1. EAH usually occurs as a solitary lesion, but cases with multiple lesions have been reported and account for approximately 26% of all cases in the literature.3,7-13 The hamartoma often appears at birth2,3,6,9,10,13-22,25 or during early childhood,7,8,16,22-24 as in the present case. In the cases reviewed that were not congenital, the mean age at the time of diagnosis was approximately 21 years, and the range was between 2 months and 73 years. EAH occurs most frequently on the acral areas and, in our review, approximately 74% of all reported lesions were limited to the extremities. However, lesions also have been reported in the sacral region,26 on the buttocks,5,19 face,9 chest,8,13,15,24 or diffusely over multiple anatomic sites.12 EAH is usually asymptomatic, but the most commonly associated symptoms are pain and hyperhidrosis reported in approximately 42% and 32% of all cases analyzed, respectively, including the present case. Approximately 17% of patients with EAH reported both pain and hyperhidrosis (sweating) simultaneously (Table 2). It is postulated that infiltration of small nerves may be responsible for the pain,27,28 and a local increase in the temperature within the angioma may produce the sweating seen in the eccrine component of the hamartoma.3,8,16,27

The diagnosis of EAH is confirmed by histology because the clinical features of the lesion are nonspecific and variable. Histologically, EAH is characterized by a dermal proliferation of well-differentiated eccrine secretory and ductal elements closely associated with thin-walled angiomatous channels. In addition to these defining elements, unusual histopathologic variants have been reported and include the infiltration of adipose tissue,11,16,29 the presence of pilar structures,6,9,11,21 apocrine glands,8 and, as in our case, increased dermal mucin.11 The epidermis typically is unremarkable but may exhibit hyperkeratosis, acanthosis, and papillomatosis.5,6 Immunohistochemical analyses using carcinoembryonic antigen and S-100 have demonstrated no difference between normal eccrine glands and those found in the hamartoma.8,10,16 In addition, ulex europaeus, CD34, CD44, and factor VIII–related antigens are expressed by the endothelial cells within the vascular component of the lesion.8,15,16 These findings help support a hamartomatous rather than tumoral origin for EAH. In addition, cytologic atypia and mitotic figures have not been reported.9,29

Imaging modalities, such as magnetic resonance imaging and ultrasound, are beginning to be used in the evaluation of EAH. One group of investigators reports that ultrasonography of a biopsy-proven EAH revealed varicose veins in cutaneous and subcutaneous layers but could not determine the size or shape of the lesion.30 Now, radiographic imaging may help confirm the clinical suspicion of an angiomatous lesion, but accurate diagnosis of EAH remains with histology.

The etiology of EAH has not been delineated clearly. Zeller and Goldman6 report that the hamartoma may be caused by abnormal induction of heterotypic dependency during organogenesis. According to this model, altered chemical interactions between the differentiating epithelium and mesenchyme result in the hamartomatous growth of these elements, generating an abnormal proliferation of vascular and eccrine structures.

The differential diagnosis of EAH includes eccrine nevus,32 a rare lesion composed of mature eccrine glands capable of producing localized hyperhidrosis. In addition, localized hyperhidrosis may be seen in a variety of other conditions, including neuritis, myelitis, syringomyelia, general paresis, and tabes dorsalis.32 However, these conditions do not produce cutaneous lesions or histologic abnormalities of eccrine glands. Localized hyperhidrosis also may accompany the blue rubber-bleb nevus syndrome, but histology may distinguish EAH from this disorder. Likewise, EAH clinically may resemble tufted angioma, macular telangiectatic mastocytosis, nevus flammeus, glomus tumor, and smooth muscle hamartoma.9,22,25 These conditions are readily differentiated by histologic analysis.

EAH is a benign and typically slow-growing lesion, though a rapid increase in size was noted in one pregnant woman, indicating that it may be under hormonal influence.31 In this case, partial amputation of the involved finger was necessary to relieve the patient's intractable pain. In general, however, aggressive treatment of EAH is unwarranted. Simple excision usually is curative and reserved for painful or cosmetically unacceptable lesions. One study reports no evidence of recurrent disease 15 months after excision.17 Indeed, the pain associated with EAH may remit spontaneously without treatment, even after several years.28 

Eccrine angiomatous hamartoma (EAH) is a benign and uncommon malformation, characterized by increased numbers of eccrine (sweat) glands and numerous capillary channels. It is usually congenital or arises during the prepubertal years; the lesion only rarely presents during adulthood. The color of EAH may be flesh colored, blue-brown, or reddish and may occur as a nodule, plaque, or, less commonly, a macule. In most cases, EAH arises as a single lesion on the extremity, though reports of multiple lesions and those occurring in more unusual sites exist. The symptoms most commonly associated with EAH are pain and hyperhidrosis; enlargement may occur and is usually in concordance with the growth of the patient. It is important to recognize the hamartoma as a benign clinical entity, for which aggressive management is not necessary. In this article, we report a case of EAH occurring in a young girl, and we review 41 well-documented cases in the literature. 

CASE REPORT

A 12-year-old previously healthy Hispanic girl presented with a lesion on the posterior aspect of her left lower leg. She reported that the lesion had been present since approximately 4 years of age. The patient denied spontaneous pain but described increased perspiration associated with the lesion, including occasions when she noted wet spots on her clothing overlying the area. Findings from the physical examination revealed a 6x5-cm, flesh-colored, palpable tumor in the left calf. Secretion of a clear fluid could be seen originating from the surface of the tumor, and hypertrichosis was present (Figures 1 and 2). A 4-mm punch biopsy of the mass was performed, and results confirmed the diagnosis of EAH (Figure 3). Results of histopathologic examination revealed an unremarkable epidermis. An increased number of sweat glands and terminal hair follicles were found in the dermis, and dilated sweat ducts were noted in the papillary dermis. In addition, large dilated blood vessels were seen in the deep dermis and subcutaneous tissue. Intercellular mucin also was present in the dermal stroma. The constellation of clinical and pathologic features was consistent with the diagnosis of EAH.

The patient declined further diagnostic radiographic evaluation and surgical treatment. She was treated symptomatically for the hypertrichosis and hyperhidrosis, using 13.9% eflornithine cream and topical aluminum chloride, respectively.

Comment

EAH is a rare, benign cutaneous hamartoma consisting of a proliferation of both eccrine glands and thin-walled vascular channels. First described by Lotzbeck in 18591 as an angiomatous-appearing lesion on the cheek of a child, the term EAH was coined by Hyman and coworkers2 in 1968. Since hyperhidrosis is a relatively common finding associated with this condition, various other terms have been used to describe this entity, including sudoriparous angioma3 and functioning sudoriparous angiomatous hamartoma.4 In addition to presenting an additional case of EAH, we review the other 41 cases of EAH reported in the literature (Table 1).

Typically, EAH presents as a solitary, flesh-colored, blue-brown, or reddish papule, plaque, or nodule. However, unusual morphologic variants exist and include hyperkeratotic5 and verrucous6 lesions. There appears to be no gender predilection, and the male-female ratio in the data analyzed was 1:1.1. EAH usually occurs as a solitary lesion, but cases with multiple lesions have been reported and account for approximately 26% of all cases in the literature.3,7-13 The hamartoma often appears at birth2,3,6,9,10,13-22,25 or during early childhood,7,8,16,22-24 as in the present case. In the cases reviewed that were not congenital, the mean age at the time of diagnosis was approximately 21 years, and the range was between 2 months and 73 years. EAH occurs most frequently on the acral areas and, in our review, approximately 74% of all reported lesions were limited to the extremities. However, lesions also have been reported in the sacral region,26 on the buttocks,5,19 face,9 chest,8,13,15,24 or diffusely over multiple anatomic sites.12 EAH is usually asymptomatic, but the most commonly associated symptoms are pain and hyperhidrosis reported in approximately 42% and 32% of all cases analyzed, respectively, including the present case. Approximately 17% of patients with EAH reported both pain and hyperhidrosis (sweating) simultaneously (Table 2). It is postulated that infiltration of small nerves may be responsible for the pain,27,28 and a local increase in the temperature within the angioma may produce the sweating seen in the eccrine component of the hamartoma.3,8,16,27

The diagnosis of EAH is confirmed by histology because the clinical features of the lesion are nonspecific and variable. Histologically, EAH is characterized by a dermal proliferation of well-differentiated eccrine secretory and ductal elements closely associated with thin-walled angiomatous channels. In addition to these defining elements, unusual histopathologic variants have been reported and include the infiltration of adipose tissue,11,16,29 the presence of pilar structures,6,9,11,21 apocrine glands,8 and, as in our case, increased dermal mucin.11 The epidermis typically is unremarkable but may exhibit hyperkeratosis, acanthosis, and papillomatosis.5,6 Immunohistochemical analyses using carcinoembryonic antigen and S-100 have demonstrated no difference between normal eccrine glands and those found in the hamartoma.8,10,16 In addition, ulex europaeus, CD34, CD44, and factor VIII–related antigens are expressed by the endothelial cells within the vascular component of the lesion.8,15,16 These findings help support a hamartomatous rather than tumoral origin for EAH. In addition, cytologic atypia and mitotic figures have not been reported.9,29

Imaging modalities, such as magnetic resonance imaging and ultrasound, are beginning to be used in the evaluation of EAH. One group of investigators reports that ultrasonography of a biopsy-proven EAH revealed varicose veins in cutaneous and subcutaneous layers but could not determine the size or shape of the lesion.30 Now, radiographic imaging may help confirm the clinical suspicion of an angiomatous lesion, but accurate diagnosis of EAH remains with histology.

The etiology of EAH has not been delineated clearly. Zeller and Goldman6 report that the hamartoma may be caused by abnormal induction of heterotypic dependency during organogenesis. According to this model, altered chemical interactions between the differentiating epithelium and mesenchyme result in the hamartomatous growth of these elements, generating an abnormal proliferation of vascular and eccrine structures.

The differential diagnosis of EAH includes eccrine nevus,32 a rare lesion composed of mature eccrine glands capable of producing localized hyperhidrosis. In addition, localized hyperhidrosis may be seen in a variety of other conditions, including neuritis, myelitis, syringomyelia, general paresis, and tabes dorsalis.32 However, these conditions do not produce cutaneous lesions or histologic abnormalities of eccrine glands. Localized hyperhidrosis also may accompany the blue rubber-bleb nevus syndrome, but histology may distinguish EAH from this disorder. Likewise, EAH clinically may resemble tufted angioma, macular telangiectatic mastocytosis, nevus flammeus, glomus tumor, and smooth muscle hamartoma.9,22,25 These conditions are readily differentiated by histologic analysis.

EAH is a benign and typically slow-growing lesion, though a rapid increase in size was noted in one pregnant woman, indicating that it may be under hormonal influence.31 In this case, partial amputation of the involved finger was necessary to relieve the patient's intractable pain. In general, however, aggressive treatment of EAH is unwarranted. Simple excision usually is curative and reserved for painful or cosmetically unacceptable lesions. One study reports no evidence of recurrent disease 15 months after excision.17 Indeed, the pain associated with EAH may remit spontaneously without treatment, even after several years.28