PMC5598206_01
(a, b) Preoperative radiographs showed a well-circumscribed ovoid radiopaque mass.
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F1
Plain radiography showed a well-circumscribed ovoid radiopaque mass with a structure resembling that of cancellous bone with a thin cortical shell (Figures 1a and 1b).
(a, b) Preoperative MRT showed a well-circumscribed ovoid radiopaque mass confined to the iliopsoas muscle belly.
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F2
The MRT showed that the mass was confined to the iliopsoas muscle belly distal to the inguinal ligament with non-infiltrative growth and no perifocal edema in the surrounding muscle and it was displacing the femoral neurovascular bundle (Figures 2a and 2b).
(a, b) The photograph shows the mass consisting of cancellous bone with a thin cartilage-like covering.
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F3
When sectioned, it had cancellous bone structure and a thin cartilage-like covering thicker only in the proximal pole (Figures 3a and 3b).
(a-c) Microscopic appearance from different parts of the material revealed a well presented cap of hyaline cartilage gradually changing into trabecular bone (hematoxylin and eosin, x40).
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F4
Microscopy showed a typical structure of osteochondroma with thin mature cartilage at the periphery and cancellous bone with bone marrow in the intertrabecular spaces (Figures 4a-4c).