Mucinous Carcinoma

• Rare adnexal tumor likely from eccrine gland
• Often presents as slow-growing nodule, ulcer, or cyst with low metastatic potential, often seen on head or neck
• Histology: islands of floating ductal structures in a lake of mucin, cells with eosinophilic cytoplasm and hyperchromatic nuclei, mucin separated by thin fibrocollagenous septae
• Must differentiate primary mucinous carcinoma from metastatic tumors (especially breast or GI origin)
• Treatment: local excision; high rate of recurrence