Primary mucinous eccrine adenocarcinoma of anterior chest wall

Mucinous eccrine carcinoma is a very rare cutaneous malignancy, rarely documented in literature (0.05%.) It is commonly found in lower extremities. It is a tumor of old age. Diagnosis is mainly by histopathological report, as clinical diagnosis is very difficult. A 60-year-old female residing nearby village presented with lump left breast of 6 months. A solitary lump left breast was present over nipple areola with no regional lymph nodes. Mucinous eccrine tumors are common in the 6th decade with male: female ratio 2:1. They present as nodular cutaneous swelling with no distinct clinical features, making it difficult to diagnose preoperatively. They metastasize to regional lymph nodes, lungs, liver, and bones. Five-year survival rate is 59% without metastasis. It comes down by 9% with lymph node involvement. Surgery is the principal mode of treatment; Histopathological examination confirms the diagnosis and since the cells are rich in glycogen they stain with PAS. Difficult to distinguish except by Hisochemistry from adnexal tumors. Immunohistochemistry aids in confirming the diagnosis. Primary mucinous adenoma with reported incidence of 0.05% is one of the rarest tumors. Immunohistochemistry complement in confirming the diagnosis. Wide excision is the treatment of choice. Close follow-up is essential.