Spindle Cell Lipoma: Rare Breast Mass Imaging Findings and-Differential Diagnosis

Spindle Cell Lipoma (SCL) of the breast is a rare variant of breast lipoma. It is most commonly observed in the subcutaneous soft tissues of the upper back and posterior neck in males. Our case details a 65-year-old female who presents for routine screening mammogram and was subsequently found to have an enlarging oval mass in the right breast. The patient was recalled for diagnostic mammogram including core biopsy which revealed mature adipose tissue with spindle cells and collagen. Although these lesions generally follow a benign course, the patient was advised to pursue a follow-up appointment with a breast surgeon as the lesion had doubled in size over the course of a few years. ommegaonline.org gen-forming spindle cells[1]. They most often occur in males between 40–70 years old in the subcutaneous tissue of the upper back, posterior neck, and shoulders[1-3]. Rarely it may occur at other sites, including the breast, oral cavity, scalp, extremities, and deep-seated muscles[4]. The overall incidence of spindle cell lipomas is 100 fold greater in men than in women, but mammary spindle cell lipomas occur with equal frequency in males and females. Review of the literature demonstrates a few case reports and one case series: Case report of 28 year old woman (Pathology 1999;31:288)[5] . Case report of 48 year old woman (Indian J Pathol Microbiol 2008;51:234)[6] . Case report of breast lump in a 66-year-old female (Acta Cytol 2000;44:255)[7] Case report of spindle cell lipoma of the breast found on mammography in a 53-year-old woman[8] Case series of fine needle aspiration cytology of eight breast