{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,4]],"date-time":"2026-11-04T11:58:38Z","timestamp":1793793518610,"version":"4.6.1"},"reference-count":20,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2015,1,14]],"date-time":"2015-01-14T00:00:00Z","timestamp":1421193600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J Med Imag Rad Onc"],"published-print":{"date-parts":[[2015,4]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>Posterosuperior glenoid internal impingement (<jats:styled-content style=\"fixed-case\">PGII<\/jats:styled-content>) is an impingement syndrome of the shoulder that is most commonly seen in the throwing or overhead athlete. The supraspinatus can be normally compressed or impinged between the greater tuberosity and the posterosuperior labrum in the abduction and external rotation position. However, repetitive throwing and biomechanical abnormalities may lead to the intensification of this contact and to the clinical and pathological picture of <jats:styled-content style=\"fixed-case\">PGII<\/jats:styled-content>. The injured athlete usually complains of poor throwing performance and pain located in the posterosuperior aspect of the shoulder. Two main theories regarding the aetiology of <jats:styled-content style=\"fixed-case\">PGII<\/jats:styled-content> have been postulated with differing initial mechanisms. The <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> features of <jats:styled-content style=\"fixed-case\">PGII<\/jats:styled-content> have been described and include supraspinatus and anterior infraspinatus partial undersurface tears, bony changes at the humeral head and labral pathology, including a variation of the <jats:styled-content style=\"fixed-case\">type II<\/jats:styled-content> superior labrum from anterior to posterior lesion. This pictorial essay aims to present cases illustrating the pathophysiology, clinical features and recently described <jats:styled-content style=\"fixed-case\">MRI<\/jats:styled-content> findings, and discuss some of the <jats:styled-content style=\"fixed-case\">MR<\/jats:styled-content> protocol considerations.<\/jats:p>","DOI":"10.1111\/1754-9485.12276","type":"journal-article","created":{"date-parts":[[2015,1,14]],"date-time":"2015-01-14T14:51:38Z","timestamp":1421247098000},"page":"182-187","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":29,"title":["Posterosuperior glenoid internal impingement of the shoulder in the overhead athlete: Pathogenesis, clinical features and <scp>MR<\/scp> imaging findings"],"prefix":"10.1111","volume":"59","author":[{"given":"Chris Kon","family":"Fessa","sequence":"first","affiliation":[{"name":"Prince of Wales Hospital  Sydney New South Wales 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