Diagnostic Dilemma in Spindle Cell Lesions of Breast- A Case Report

Abstract

Spindle cell lesions of breast pose diverse morphological patterns which can turn out to be reactive, benign and malignant tumours with overlapping features. Differential diagnosis are wide. It is challenging to the pathologist due to its rarity. The origin of spindle cell lesions of the breast is highly variable and represents multiple lineages. Hereby authors report a case of a 56-year-old female presented to the Outpatient Department with left breast swelling. Mammogram showed hypoechoic ill-defined irregular lesion. On imaging findings, evolving abcess and neoplastic were consider probable diagnosis. On histopathological examination, the lesion showed bland spindle cells arranged in short fascicles and and in diffuse pattern. The lesion was diagnosed as spindle cell lesion. Immunohistochemistry confirmed the diagnosis of fibromatosis. The standard treatment of wide local excision with adequate safety margins was done. Postoperative period was uneventful. On two years follow-up, the patient had no recurrence. While being very rare at this site, the lesion has locally aggressive behaviour with high recurrence rate.