Atypical presentation of Liposarcoma involving the breast: a case report.

A 62-year-old woman presented to our institution with a 3-year history of left-sided breast mass. Diagnostic imaging three years prior suggested the presence of a lipoma with no suspicious findings. The patient noted that the mass continued to grow with no significant clinical symptoms. Imaging revealed a substantial difference in breast size, with the left breast largely occupied by a fatty vascular soft tissue mass. The patient was diagnosed with liposarcoma arising from or infiltrating the pectoralis major and minor muscles. The patient underwent a mastectomy, and the final pathology results confirmed an atypical lipomatous tumour with well-differentiated liposarcoma components. Liposarcoma should be considered and ruled out in cases of any large or growing fatty masses in the breast.