Oral collision cancer: A case report and literature review of simultaneous squamous cell and adenoid cystic carcinoma of the oral mucosa

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Abstract
Background: Collision cancer consists of two histologically distinct and topographically independent tumors in the same lesion and is extremely rare in the oral mucosa.Case Presentation: We describe a case of oral collision cancer consisting of squamous cell and adenoid cystic carcinomas in the buccal mucosa of a 76‐year‐old man. Accurate diagnosis of resected specimens is histopathologically important in follow‐up as it can significantly affect treatment planning and prognosis.Conclusion: This case illustrates the importance of considering oral collision cancer comprising two cancerous components.

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