Eccrine angiokeratomatous hamartoma combined with solitary angiokeratoma or verrucous venous malformation: Report of two cases and comprehensive review of the literature

First reported in 2006, eccrine angiokeratomatous hamartoma is a very rare vascular malformation of the skin, with only few described cases. It has a peculiar histopathology with features deriving from the combination of two different vascular malformations of the skin: solitary angiokeratoma and eccrine angiomatous hamartoma. In the past, other authors described similar hamartomatous lesions with features deriving from verrucous venous malformation and eccrine angiomatous hamartoma. We believe that these lesions are clearly overlapping from clinical, histopathological, and immunohistochemical points of view and the term “eccrine angiokeratomatous hamartoma” should be used to indicate the whole spectrum of these lesions as suggested by Kanitakis et al. Herein we present two cases of this rare vascular hamartoma, with clinical, histopathological and immunohistochemical characterization. In addition, for the first time we report a complete and detailed review of the literature to clarify the clinical, epidemiological, and histopathological features of this unique entity.