Parosteal lipoma mimicking a breast tumor

Description

Parosteal lipoma is a rare benign tumour that is composed mainly of mature adipose tissue, and is contiguous to the periosteum of the underlying bone.1 Most parosteal lipomas are asymptomatic, but some may present motor and/or sensory deficits.2

A woman was seen in our office complaining a left breast tumour. The woman first noticed the tumour several years ago and underwent breast cancer screening annually but was never required for further evaluation. The tumour was slowly growing, and was associated with pain when lying in a prone position. On physical examination, a soft tumour measuring 9 cm could be felt in the lower-inner quadrant of the left breast, and was firmly fixed to the chest wall. Mammogram showed a well-circumscribed, smooth, lipomatous mass containing a coral-like calcification (figure 1). Breast ultrasonogram showed a large lipomatous nodule near the caudal end of the...

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