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Collision tumors, defined as “two independent neoplasms that occur in close proximity to one another but maintain distinct boundaries,” are quite rare. We report an exceptional collision tumor composed of a genetically confirmed malignant glomus tumor and a fumarate hydratase (FH)‐deficient leiomyoma, presenting as a subcutaneous thigh mass in a 38‐year‐old male who was known to have hereditary leiomyomatosis...