PMC5892980_01
Nonmobile 4 cm mass at the posterior aspect of the scapula.
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The physical examination revealed a nonmobile 3 cm T x 3 cm AP x 2 cm CC hard mass on the posterior superomedial angle of the right scapula, sensitive to palpation (Figure 1).
Thoracic CT scan axial view illustrating the solid mass measuring 2.6 cm T x 2.6 cm AP x 2.2 cm CC (orange arrow) at the superomedial aspect of the right scapula.
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T x 2.6 cm AP x 2.2 cm CC solid bone mass at the posterior aspect of the superomedial angle of the scapula. The diagnosis of an osteochondroma without signs of malignancy was stated (Figure 2).
Thoracic MR imaging of the osteochondroma. T1 axial view (a) illustrating the benign 9 mm smooth cap (green arrow). T2 coronal (b) and sagittal (c) views showing the osteochondroma measuring 2.6 cm T x 2.6 cm AP x 2.2 cm CC (orange arrows) located on the right scapula and compressing the accessory nerve (blue arrows).
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The accessory nerve (XI) was compressed between the osteochondroma and the deep layer of the trapezius; no muscle atrophy was described (Figure 3).
Surgical view of the osteochondroma. The lesion measured 3 cm T x 3 cm AP x 2 cm CC.
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T x 3 cm AP x 2 cm CC (Figure 4).
Histopathological section of the osteochondroma illustrating the bony trabeculae (blue arrow) and the cartilage component of the lesion (orange circle).
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The integrity of the accessory nerve was checked before closure. The histopathologic analysis confirmed the diagnosis of a benign osteochondroma (Figure 5).