PMC9851693_01
MRI showing lobulated intermediate hyperintense mass within the posterior glenohumeral recess.
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F1
MRI of right shoulder revealed a lobulated intermediate hyperintense mass within the posterior glenohumeral joint recess abutting the posterior glenoid and labrum (Figure 1).
Intraoperative arthroscopy showing calcified ovoid mass.
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F2
The patient underwent a right shoulder arthroscopy with excision of the mass (Figure 2).
A, Extensive osteoid production with peripheral calcium pyrophosphate calcification, H&E stain, 20x magnification. B, Cellular fibrous stroma with a swirling pattern, H&E stain, 100x magnification. C, Loose connective tissue stroma with interspersed vessels and focal areas of acute inflammation, H&E stain, 100x magnification. D, Myxoid stroma containing benign fibroblasts, H&E stain, 100x magnification. E, Loose connective tissue stroma with focal areas of acute inflammation, H&E stain, 200x magnification. F, Rare mitotic figure in fibromyxoid stroma, H&E stain, 400x magnification. G, Osteoid production with interspersed fibromyxoid stroma, H&E stain, 200x magnification.
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F3
Pathologic examination of the excised tissue (Figure 3) showed a fibromyxoid and osseous lesion, with features consistent with HO.