Mucocele-like tumor of the breast: a case report and assessment of aspirated cytological specimens

Abstract
Background: Mucocele-like tumor (MLT) is a rare benign condition, and often misdiagnosed as mucinous carcinoma. Methods: We encountered a 31-year-old woman with MLT of the breast. The patient presented with an elastic hard mass, 0.5 cm in diameter, located in the upper outer quadrant of the right breast. Results: Physical examination as well as ultrasonography and mammography indicated a benign lesion. However, mucinous carcinoma was suspected based on aspiration biopsy cytology. MLT was finally diagnosed on excisional biopsy. Conclusions: Awareness of this breast disease helps to prevent misdiagnosis and unnecessary surgery.

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