Intraneural ganglion cyst of the ulnar nerve in an unusual location: A case report.

•Intraneural ganglion cysts are benign, mucinous, non-neoplastic lesions of the peripheral nerves that arise from the epineurium.•An intraneural ganglion cyst involving the superficial branch of the ulnar nerve is a unique presentation.•Regarding etiopathogenesis of the intraneural ganglion cysts, the latest and most affirmed theory is the unifying articular (synovial) theory.•It is important to realize a related articular branch, otherwise the origin of cyst formation remains, and this may cause other para-articular cysts.•Use of new 3-dimensional fast-spin echo-extended echo train MRI sequences may provide better visualization of the intraneural ganglions.