Hung C.-Y.KE-VIN CHANGChen P.-T.Ho Y.-T.DER-SHENG HANWEN-SHIANG CHENTYNG-GUEY WANG2020-09-082020-09-0820140899-7071https://www.scopus.com/inward/record.uri?eid=2-s2.0-84898686562&doi=10.1016%2fj.clinimag.2013.12.019&partnerID=40&md5=c090101e63adc2137b42be8df9c44cf3https://scholars.lib.ntu.edu.tw/handle/123456789/513931Entrapment axillary neuropathy at the quadrilateral space, also known as quadrilateral space syndrome (QSS), is a rare cause of posterior shoulder pain. We present a case of an axillary schwannoma causing QSS evaluated by both conventional ultrasound and sonoelastography. The application of sonoelastography is useful in elaborating the elastic feature of a soft tissue tumor, which provides additional information to conventional ultrasound regarding its growth pattern, and can help the differential diagnosis and guide the management. ? 2014 Elsevier Inc.[SDGs]SDG3Diagnosis; Axillary schwannoma; Differential diagnosis; Growth patterns; Quadrilateral space syndrome; Shoulder pain; Soft tissue tumor; Sonoelastography; Ultrasonics; acoustic radiation force impulse imaging; adult; article; axilla; axillary schwannoma; case report; causal attribution; differential diagnosis; disease association; echography; elastic tissue; elastography; female; human; image analysis; middle aged; neurilemoma; nuclear magnetic resonance imaging; priority journal; quadrilateral space syndrome; rotator cuff injury; shoulder pain; soft tissue; sonoelastography; tumor localization; tumor volume; ultrasound transducer; axilla; complication; echography; elastography; Nerve Compression Syndromes; neurilemoma; shoulder pain; Axilla; Diagnosis, Differential; Elasticity Imaging Techniques; Female; Humans; Middle Aged; Nerve Compression Syndromes; Neurilemmoma; Shoulder Painjournal article10.1016/j.clinimag.2013.12.019245597492-s2.0-84898686562