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Collision Tumour — SCE Dermatology MCQ

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HardSkin CancerCollision TumourSCE Dermatology

A single specimen contains an arborising-vessel basal cell carcinoma immediately adjacent to a separate melanocytic proliferation with an atypical network. Histology confirms two abutting, biologically independent tumours. What is this called?

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Correct answer: C — Collision tumour

A collision tumour consists of two independently arising neoplasms occurring in direct proximity while retaining distinct histological identities. Each component must be assessed on its own merits because a benign-appearing epithelial component does not reduce the significance of an adjacent melanoma.

Reference: https://academic.oup.com/bjd/pages/bad-guidelines