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Background: Eccrine angiomatous hamartoma (EAH) is a rare benign cutaneous tumor characterized by the proliferation of eccrine glands and capillaries. Objective: The aim of this study was to summarize the clinicopathological characteristics of EAH. Methods: A retrospective chart review was performed on all patients diagnosed with EAH from 1977 to 2012 in the Union Hospital, Wuhan, P.R. China, and the clinicopathological features were compared with the cases reported in the literature. Results: A total of 26 patients with EAH were identified. The male:female ratio was 1.2:1. EAH most commonly presents as a solitary (80.8%) plaque (50.0%) on the lower extremities (61.5%). Most patients presented with hyperhidrosis localizing to the lesion. Although most patients did not have major pain or anatomic deformity, one patient had severe pain as well as difficulty walking and moving, necessitating leg amputation. The histopathological findings showed typical features of EAH. Conclusion: EAH is a rare but characteristically benign skin hamartomatous condition. In rare occasions it can be associated with severe structural and functional impairment.

A case of multiple eccrine angiomatous hamartoma present in a boy since birth is reported. Clinically, this condition must be differentiated from other neonatal angiomatoses. Sometimes the clinical findings are nonspecific, whereas histologic examination may exclude angiomatoses with visceral involvement. In our case the hamartomatous nature of this tumor is documented also by the presence of pilar structures intimately related to the eccrine-angiomatous complex in one of two lesions histologically examined. Therefore, the histologic classification of eccrine angiomatous hamartoma into subgroups seems to be excessive.

A case of painful eccrine angiomatous hamartoma of the wrist in a 10-year-old girl is presented. It was located in the reticular dermis and contained abnormal tubules resembling eccrine secretory coils and thin vascular channels dispersed in the collagenous tissue of the dermis. Some eccrine ducts showed dilatation. The noteworthy features of this case were the absence of hyperhidrosis over the lesion, and the presence of focal neural infiltration by the tubular structures. Electron microscopy showed mostly clear cells and occasional dark cells lining the tubular structures. This case supports the theory of abnormal induction of heterotypic dependency with resultant malformation of adnexal as well as mesenchymal elements.

A skin lesion consisting of increased numbers of eccrine sweat ducts associated with enveloping angiomatous vascular channels is presented. Although a small number of similar lesions have been described, the present case is unique in that the regional pilar structures were also involved by the periadnexal vascular proliferation. The intimate topographic relationship between the epithelial and mesenchymal components suggests that the lesion arises as a consequence of abnormal adnexogenesis involving biochemical evocators of these respective components.