Collision Tumor: A Diagnostic Challenge
The coexistence of two or more different neoplasms, benign or malignant, in the same cutaneous lesion is called a "collision tumor”. The clinical diagnosis is difficult and dermatoscopy is an often useful tool, however it may not be enlightening. We present the case of a rare association between a blue nevus and a histiocytofibroma that both clinically and dermatoscopically could be confused with malignant melanoma.
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