A case of spindle cell lipoma of the breast found on mammography in a
53-year-old woman is presented. This rare type of tumor has been previ
ously reported on only after its presentation as a palpable mass. Radi
ographically it appears as a well-circumscribed mass. Ultrasonographic
ally it appears as a homogeneously hyperechoic nodule. Histologically
these lesions are composed of spindle cells intermingled with adipocyt
es.