PMC9937833_01
Lateral plain radiograph of the right elbow obtained preoperatively showing an osseous mass in the posterior aspect of the distal humerus.
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Plain radiographs of the right elbow revealed an osseous mass located in the olecranon fossa with features of a sclerotic and calcified cortical margin (Fig. 1).
Axial magnetic resonance image (MRI) section of the right elbow showing an intra-articular osseous mass.
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A nonenhanced magnetic resonance image showed a well-defined intra-articular nodule (2.8 x 2.6 x 1.7 cm) in the right elbow's posterior joint space, with internal mineralization areas (Figs. 2 and 3).
Sagittal magnetic resonance image (MRI) section of the right elbow showing an intra-articular osseous mass.
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A nonenhanced magnetic resonance image showed a well-defined intra-articular nodule (2.8 x 2.6 x 1.7 cm) in the right elbow's posterior joint space, with internal mineralization areas (Figs. 2 and 3).
Operative findings: posterior right elbow approach revealing a solid mass consisting of osseocartilaginous nodules situated in the olecranon fossa.
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The lesion was intra-articular, situated in the olecranon fossa, and extra-osseous (Fig. 4).
Gross specimen of the osteochondroma after surgical removal.
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Grossly, the external surface was knobby and bluish-white and was consistent with features of an osteochondroma (Fig. 5).
Macroscopic appearance of the specimen: Bosselated outer surface covered by smooth perichondrium.
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It consisted of a lobulated bony outgrowth with a smooth outer surface measuring 4.0 x 2.6 x 1.5 cm (Fig. 6).
Macroscopic appearance of the specimen: Cut surface showed a cartilaginous cap not exceeding 2 cm in thickness (arrow) and a stalk containing marrow elements.
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The cut surface revealed a cartilaginous cap that is less than 2 cm in maximum thickness with an underlying broad base (Fig. 7).