Giant hand lipoma invaginating the thenar muscles.

To cite: Iyengar KP, Matar HE, Loh WY. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2014203963 DESCRIPTION Lipomas are among the most common of all tumours occurring almost anywhere in the body. They usually arise in the subcutaneous layer consisting of lobules of fat with a surrounding capsule which may become tethered to neighbouring structures. 2 Patients are usually present with a painless, soft, well-defined swelling. If the lump is troublesome, it may be removed by marginal excision. Prior biopsy is usually unnecessary; however, if any atypical features are present, preoperative staging and biopsy are required. 2 MRI is the most reliable imaging method to diagnose lipomas. We present a rare case of giant lipoma of first web space of the hand in a 68-year-old right-handed woman. She presented with a 2-year history of a painless swelling on her right hand (figure 1). The size of the swelling has gradually increased and it