Basal‐cell carcinoma complicating a port‐wine stain

A rare radio‐resistant basal‐cell carcinoma is described which presented as a recently enlarged non‐ulcerated nodule on a port‐wine stain. The literature on basal‐cell carcinoma occurring on a port‐wine stain is reviewed, and the aetiological significance of thorium‐X, sun‐exposure and vascular changes in the development of malignancy on this type of haemangioma is discussed.

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