Abstract
Cutaneous collision tumours are the co-existence of two tumours of different histopathological morphologies that coincide at the same or adjacent anatomical sites. A large scalp nodule excised from a 70year-old man revealed a collision tumour composed of cells of squamous carcinoma (SCC) and malignant melanoma. Immunohistochemistry using dual staining for melanoma and squamous cell carcinoma demonstrated an unusual pattern; nests of melanoma cells surrounded by a layer of squamous carcinoma cells. The unique architecture observed in the case suggested a relationship between the two tumours.
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