Eccrine Porocarcinoma of the Chest Wall.

Eccrine porocarcinoma is a rare malignant tumor of skin sweat glands. It accounts for 0.005% of cutaneous tumors. It may present in a myriad of ways ranging from indolent swellings to aggressive tumors with metastasis. Notably, it is difficult to diagnose clinically. Histopathology is necessary and the pathologist often makes the diagnosis. Early intervention can lead to a curative outcome. We present a case of a 65-year-old man who presented with painless swelling in the upper back. Wide local excision was done with rhomboid flap reconstruction. The diagnosis was made postoperatively on histopathology examination. After 10 months of follow-up, there was no sign of recurrence.