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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)