A 71-year-old man with a past history of right-sided, renal cell carcinoma presented with a recurrent, right upper eyelid lesion (Box, Figure A). The initial biopsy showed Bowen's disease, but review after Mohs micrographic surgery revealed focal sebaceous differentiation suggestive of in-situ sebaceous carcinoma. A diagnosis of Muir–Torre syndrome was suspected, and the patient was referred for genetic counselling and targeted cancer surveillance. This led to the discovery of multiple dysplastic colonic adenomas and a left renal cell carcinoma (Box, Figure B).

Muir–Torre syndrome is an autosomal-dominant genodermatosis characterised by cutaneous sebaceous neoplasia and one or more visceral malignancies. Diagnostic criteria include at least one sebaceous gland adenoma, epithelioma, or carcinoma, and at least one internal malignancy. The diagnosis of sebaceous carcinoma can be difficult, particularly in the periocular region, where it often masquerades clinically as blepharoconjunctivitis or recurrent chalazia. Furthermore, sebaceous carcinoma often displays only focal differentiation and, as seen in our patient, may be histologically misdiagnosed as squamous-cell or basal-cell carcinoma. A history of internal malignancy in patients presenting with sebaceous gland carcinoma should raise the possibility of Muir–Torre syndrome. Correct diagnosis in this case enabled early detection of dysplastic colonic polyps and renal cell carcinoma.

A: Clinical photograph showing induration and ulceration of the central right upper eyelid margin.

B: Computerised tomography scan showing a left renal mass (arrow) confined to the capsule.