Among the various reasons that can cause entrapment of suprascapular nerve, suprascapular cyst is not commonly found and more often, overlooked or misdiagnosed. Authors experienced one case of suprascapular cyst causing suprascapular nerve entrapment confirmed by ultrasonography and MRI. Symptom of the patient was confined to infrascapular nerve. Percutaneous aspiration of cyst was done under the guidance of ultrasonography through Neviaser portal on out-patient department. After 8 weeks of follow-up, no recurrent lesion was found and objective functional improvement was identified. When clinicians confront with the symptoms compatible with suprascapular nerve entrapment, every effort should be put on finding lesion under ultrasonography before attempting any further cost-ineffective or time-wasting evaluation. Symptoms caused by space-occupying cyst will be soothed by simple decompression. However, always be aware of concomitant lesions that might be the reason for the cystic lesion and in some cases, further evaluation is inevitable.