Dermal Eccrine Cylindroma

Certain dermal appendage tumors have a striking histologic and clinical homology with some tumors arising from the salivary duct system. The dermal eccrine cylindroma is an exemplar. Arising from the eccrine ducts, this neoplasm is only occasionally found outside the head and neck, has a recurrence rate of over 40%, and in its malignant form is a high-grade carcinoma. Its counterpart in salivary glands the dermal analogue tumor, manifests a histologic similarity, if not identity, also has a relatively high recurrence rate, and can also undergo malignant change.