Microcystic adnexal carcinoma: A case report.

Abstract

Microcystic adnexal carcinoma is a rare malignant cutaneous adnexal neoplasm characterized by slow growth but locally aggressive behavior, with infiltrative growth and a high rate of local recurrence. Clinically, it may mimic other cutaneous neoplasms, particularly morpheaform basal cell carcinoma, posing a significant diagnostic challenge.

We present the case of a 73-year-old woman with a history of multiple basal cell carcinomas who presented with an infiltrated plaque located on the left malar region with an approximately one-year history of evolution. Dermoscopic examination revealed a central crust, adherent yellow keratin, and fine arborizing telangiectasias. The patient was treated with Mohs micrographic surgery requiring four stages, with a favorable outcome and no evidence of recurrence to date. This case highlights the importance of clinicopathological correlation for the timely diagnosis of this uncommon adnexal neoplasm.