https://www.cureus.com/articles/113038-collision-tumor-comprised-of-atypical-fibroxanthoma-and-invasive-squamous-cell-carcinoma-a-case-report-of-an-extremely-rare-entity
Single benign or neoplastic dermal lesions are very common. Lesions with two distinct tumors occurring as a single entity are extraordinary and known as collision tumors. In the present case, the lesion was diagnosed on biopsy, and later, wide local skin exci…
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