Entrapment of the dorsal sensory branch of the ulnar nerve by circumferential extraneural lipoma

Excerpt

Numerous lesions have been cited as the causes of ulnar nerve compression syndromes at various sites, but isolated ulnar nerve involvement confined to the dorsal sensory branch of the ulnar nerve is uncommon [1]. The most common cause of ulnar nerve compression is a ganglion. In addition, various types of adipose lesions, such as extraneural lipoma, intraneural lipoma, and lipomatosis of nerve, could compress peripheral nerves [2‐20]. Circumferential extraneural lipoma is an extremely unusual adipose lesion of a nerve [3]. To the best of our knowledge, entrapment of the dorsal sensory branch of the ulnar nerve by a circumferential extraneural lipoma has not been previously reported. Here we report the case of a 55-year-old male patient who developed entrapment of the dorsal sensory branch of the ulnar nerve due to a circumferential extraneural lipoma. We include a literature review. …