Unusual location of intermuscular lipoma; a thenar lipoma: Report of a rare case and review of the literature

Lipoma is the most common benign tumor. It is predominantly located in subcutaneous tissue, hence its rarity in the hand. It can also be intramuscular or intermuscular with respective frequency of 1 to 5% and 0.3 to 1.9% of all benign adipocytic tumors. Lipomas in the dominant hand are noted early and often removed because of functional deficit. MRI is reliable for diagnosis, localization and size estimation. However, ultrasound can be a cost-effective alternative when the tumor is not contiguous with neurovascular structures and suspicion for malignancy is low. Histology remains the gold standard for the definitive diagnosis. We report the case of a 53-year-old woman with a pathologically confirmed diagnosis of intermuscular lipoma of the thenar, treated with surgical removal due to impairment of hand function and reduction of grip strength. We report the case of a 53-year-old woman with a pathologically confirmed diagnosis of intermuscular lipoma of the thenar, treated with surgical removal due to impairment of lateral patellar dislocation with vertical axis rotation of 90° is rare. We describe hand function and reduction of grip strength. Intermuscular lipomas of the thenar are extremely rare and to the best of our knowledge, only few cases have been reported in the literature so far.