Primary cutaneous mucinous carcinoma: a rare entity.

Area of Science:

• Dermatology
• Oncology
• Pathology

Background:

• Primary mucinous carcinoma of the skin is an uncommon adnexal neoplasm originating from sweat glands.
• This tumor type is rare, and its occurrence in specific locations warrants detailed reporting.

Observation:

• A 70-year-old male presented with a slow-growing mass near the lateral canthus of his left eye.
• Initial clinical diagnosis suggested a benign fibroma.
• An excisional biopsy was performed for definitive diagnosis.

Findings:

• Histopathological examination of the biopsy revealed mucinous carcinoma of the skin.
• Further investigations ruled out metastatic mucinous carcinoma from other primary sites.
• The lesion was confirmed as a primary cutaneous mucinous carcinoma.

Implications:

• This case highlights the lateral canthus as a rare but possible site for primary mucinous carcinoma.
• Accurate diagnosis is crucial, distinguishing primary skin tumors from potential metastases.
• Such rare presentations contribute to understanding the spectrum of cutaneous adnexal tumors.