Primary mucinous carcinoma of the skin is a rare malignant tumour of sweat gland origin. Diagnostic concerns include its deceptively benign appearance in some cases and the difficulty in differentiating it from secondary mucinous carcinoma of skin metastasising from a primary source elsewhere. A case of a 75-year-old man is reported who presented with a slowly growing painless mass near the lateral canthus of the right eye for about 2 years. Clinically, a diagnosis of basal cell carcinoma was made whereas histopathology revealed mucinous carcinoma of the skin. The primary source of the tumour could not be found on detailed physical examination and laboratory investigations. Immunohistochemistry, performed later, was consistent with primary cutaneous mucinous carcinoma.
- skin cancer
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Contributors HJ planned to write the case report; major role in acquisition and analysis of all the necessary investigations and information related to the patient; wrote the case report after thorough literature review; participated in the final approval of the version to be published. NR supervised and revised the case report; major role in acquisition and analysis of data; provided the final approval of the version to be published. UE played a role in writing the case report draft; literature review; participated in the final approval of the version to be published. TS supervised and edited the case report. All authors agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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