Surg Cosmet Dermatol. 2025;17(4):1-5
A collision tumor is a rare condition that occurs when two or more cutaneous tumors coexist in the same anatomic region. The objective of this study is to present the case of a 70-year-old male patient with a collision tumor of melanoma in situ and a nodular basal cell carcinoma, discussing clinical, histological, and therapeutic aspects, highlighting the importance of differential diagnosis in complex cutaneous neoplasms. Given the limited number of cases in the literature, predicting the biological behavior of collision tumors is challenging. Therefore, careful patient follow-up and further studies are necessary to better understand this condition.
Keywords: Collision Tumor; Melanoma; Basal Cell Carcinoma; Dermoscopy
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