Difficult Diagnosis of Mucinous Carcinoma of the Breast Occurred Near by Fibroadenoma: Report of a Case

Abstract

We experienced a case of mucinous carcinoma that occurred near a fibroadenoma. A 39-year-old woman presented to our hospital with the chief complaint of spontaneous nipple discharge. Ultrasonographic examination revealed two lesions in her right breast. The two lesions exhibited similar ultrasonographic features. Core needle biopsy was performed for one lesion, which led to the pathological diagnosis of fibroadenoma. Three years later, three tumors were found in her right breast. Core needle biopsy was performed for the newly-developed lesion. The tumor was diagnosed as mucinous carcinoma of the breast. Breast-conserving surgery with sentinel lymph node biopsy was performed. The pathological diagnosis was multiple mucinous carcinoma and fibroadenoma. It is necessary to perform core needle biopsies for each lesion in the diagnosis of multiple lesions of the breast.