Letter to the Editor - Intramuscular Lipoma of the Pectoralis Major Muscle

A 70-year-old post-menopausal woman presented with a 7-years history of a slowly increasing painless swelling in the right breast with pain and discomfort over the right shoulder for past 6-months. Local examination showed an enlarged right breast having a 16x8 cm size, hard, non-tender lump in the upper half with normal overlying skin, nipple and areola. The mammography appearance was suggestive of a benign sub-mammary lipoma. On sonography, the mass was homogenously echogenic with well defined margins. CT scan showed a big solitary, homogenous fat density mass (-100 HU) in the right sub-mammary region with intervening septations and bisecting the pectoralis major muscle. No haemorrhage, necrosis or calcification was noted. Except anterior displacement of the right breast, both breasts and axillae were normal. No post-contrast enhancement of the lesion was noted. These findings were consistent with a diagnosis of lipoma of the right pectoralis major muscle.