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Cystic Lesions in the Posterosuperior Portion of the Humeral Head on MR Arthrography: Correlations with Gross and Histologic Findings in Cadavers

Wook Jin1, Kyung Nam Ryu2, Yong Koo Park3, Weon Kyu Lee4, Sung Hye Ko2 and Dal Mo Yang1

1 Department of Diagnostic Radiology, Gil Medical Center, Gachon Medical School, Inchoen 405-760, South Korea.
2 Department of Diagnostic Radiology, Kyung Hee University Medical Center, Kyung Hee University, Hoekidong 1, Dongdaemoon-ku, Seoul 130-702, South Korea.
3 Department of Anatomic Pathology, Kyung Hee University Medical Center, Kyung Hee University, Seoul 130-702, South Korea.
4 Department of Anatomy, Gachon Medical School, Inchoen 405-760, South Korea.



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  		Fig. 1A. —Pseudocyst of humeral head in cadaver of 61-year-old man. T2-weighted axial (A) and coronal (B) images show well-circumscribed high signal intensity (arrow) in posterosuperior portion of humeral head. There was no evidence of degenerative change or rotator cuff tear (not shown).

 


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  		Fig. 1B. —Pseudocyst of humeral head in cadaver of 61-year-old man. T2-weighted axial (A) and coronal (B) images show well-circumscribed high signal intensity (arrow) in posterosuperior portion of humeral head. There was no evidence of degenerative change or rotator cuff tear (not shown).

 


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  		Fig. 1C. —Pseudocyst of humeral head in cadaver of 61-year-old man. Photomicrograph of pseudocyst in undecalcified bone section shows dense collagenous wall without definite epithelial lining cells. Cortical defect (arrow) connects with joint space. No hemorrhage or hemosiderin-laden macrophages are evident. (H and E; original magnification, x12.5)

 


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  		Fig. 2. —Photomicrograph of pseudocyst in undecalcified bone section of humeral head in cadaver of 60-year-old man. Lobulated cystic structure is shown. Articular cartilage (C) adjacent to pseudocyst has normal appearance and smoothly fades out at opening of pseudocyst and trabecular bone surrounding pseudocyst. Adjacent cortex and surrounding trabeculae of pseudocyst show normal appearance without degenerative change or other abnormalities. (H and E; original magnification, x12.5)

 

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