Lipomas are benign neoplasms derived from adipose tissue composed of mature adipocytes. They account for almost 50% of all soft-tissue neoplasms and occur in up to 2% of the population. They usually present asymptomatically as solitary discrete mobile lumps found most commonly on the neck, upper back, proximal limbs and chest. In less than 1% of cases, they can be found in the distal extremities.
We discuss the case of a 65-year-old man who presented with a 2-year history of a slowly enlarging left palm swelling, with recent-onset numbness and loss of power in the distribution of the median nerve. MRI studies showed that the 5x4x2.7 cm lipoma had a component extending into the distal aspect of the carpal tunnel, compressing the median nerve. It was successfully excised, and at follow-up the patient reported complete resolution of his symptoms.
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