Porocarcinoma (or eccrine porocarcinoma) is a rare type of malignant eccrine sweat gland tumor, more frequently encountered in the lower extremities (feet and legs). It arises from the intraepidermal portion of eccrine sweat glands or acrosyringium.
It represents 0.005-0.01% of all cutaneous tumors. Even though it rarely metastasizes, 20% of patients with a porocarcinoma will present with regional lymph node metastases.
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