Squamomelanocytic tumor of the plantar aspect of the foot: A collision tumor

Abstract

Collision tumors are two cancers that coexist in the same anatomical site. The etiopathogenesis of collision tumors remains controversial. Even though collision is uncommon, the association between squamous cell carcinoma and malignant melanoma is very rare compared to basal cell carcinoma and malignant melanoma. Here, we report a case of squamous cell carcinoma with malignant melanoma which was confirmed by histopathological examination and immunohistochemistry. The patient underwent wide local excision and flap cover. This case is reported due to the rarity.