[Subpectoral lipoma developing to cervix; report of a case].

A 54-year-old Japanese female, who presented slight swelling of the supraclavicular region due to soft indolent mass without neurological impairment, was admitted to our hospital to receive surgical treatment. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed subpectoral mass surrounded by the minor pectoral muscle, the subscaplar muscle, and the bony thorax, and spread to cervix passing through between the right clavicle and the bony thorax, indicating similarity of the intensity and the density to subcutaneous fatty tissue, and then the mass was guessed to be extremely rare subpectoral lipoma. The lipoma was dissected successfully from adjacent subclavian artery and vein, brachial nerve, and surrounding muscles through sub-and supra-clavicular small skin incision without cut of the clavicle. Subpectoral lipoma is one of the benign tumor and at the operation less invasive and cosmetically superior approach should be adopted except for inevitable cases.