Nerve compression of the suprascapular nerve by a suprascapular notch occasionally occurs, but comperssion by a ganglion is very rare. We had experienced a case of compression of the suprascapular nerve by ganglionic cyst at the suprascapular notch, which confirmed by electromyographic studies after the diagnosis was suspected. MRI scan showed multiobulated cyst at the right suprascapular notch. The patient was treated by excision of the ganglion and had excellent result.

The symptomatology of suprascapular neuropathy is variable, depending principally on the etiology and location of the lesion. Among them, suprascapular nerve entrapment with isolated paralysis of the infraspinatus muscle is uncommon. We report a 27-year-old man presenting with right arm weakness. Based on the electrophysiologic and imaging findings, suprascapular neuropathy at the spinoglenoid notch due to cystic mass lesion was diagnosed.