Eccrine syringofibroadenoma: multiple lesions representing a new cutaneous marker of the Schöpf syndrome, and solitary nonhereditary tumors.

Abstract

Eccrine syringofibroadenoma (ESFA) is a rare eccrine tumor that has characteristic histopathologic features and variable clinical findings. Our purpose was to define the clinical and histopathologic features of ESFA, to assess a possible syndromic association and heredity, and to propose a clinicopathologic classification. Three solitary and five multiple cases of ESFA were analyzed and the findings compared with those of previously published cases. Clinically, solitary ESFA was typically a nonhereditary verrucous growth. Multiple examples presented as palmoplantar keratoderma and keratotic papules in a mosaic pattern. In the multiple form, four patients had the Schöpf syndrome (hydrocystomas of the eyelids, hypotrichosis, hypodontia, and nail abnormalities); one had an incomplete form of the syndrome. Histologically, ESFA showed a reticulate proliferation of thin strands of acrosyringeal cells with focal lumen formation, and a fibrovascular stroma. Malignant ESFA was present in one multiple case. Multiple (palmoplantar) ESFAs are a new cutaneous marker of the Schöpf syndrome.