case_images: PMC3603655_01
case_images: AP/lateral plain radiograph: a nidus in olecranon fossa humeri with small central sclerosis surrounded by reactive sclerosis.
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case_images: fig1
case_images: Also, the radiographic study showed a round sclerotic focus on the lateral aspect of the olecranon fossa of about 7 mm in diameter (Figure 1), which was at first interpreted as postfracture bone changes.
case_images: Sagittal, axial, and coronal computed tomography sections of the elbow show a 7 mm diameter cystic lesion that respects the cortical bone and is located at the cartilage-cortical bone junction in the posterolateral part of the olecranon fossa.
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case_images: fig2
case_images: The CT scan confirmed the presence of a 7 mm diameter cystic lesion with a central radiolucent nidus that contained a calcified centre (Figure 2).
case_images: CT image reconstruction of the elbow: protrusion of a nidus in the lateral side of the olecranon fossa.
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case_images: fig3
case_images: The cystic lesion bulged slightly through the cortical bone and was located subchondrally on the lateral aspect of the olecranon fossa (Figure 3).
case_images: Magnetic resonance image of the nidus located subchondrally and a marked sclerotization of the surrounding bone. No cortical lesion indicating the presence of OO. Signs of mild synovitis were present.
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case_images: fig4
case_images: Signs of mild synovitis were present (Figure 4).
case_images: Technetium-99 m bone scan: clearly visible "hot spot" in the distal humerus.
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case_images: fig5
case_images: The bone scan showed focal uptake of radioisotope corresponding with the site of radiographic abnormality with no other focus (Figure 5).
case_images: (a) Arthroscopic removal of juxtaarticular osteoid osteoma of the olecranon fossa. (b) Removal of the hypertrophic synovium. ((c) and (d)) The crater at the site of the lesion after its total removal.
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case_images: fig6
case_images: Hyperaemic and hypertrophied residual tissues were clearly identified and were removed completely without capsular release (Figure 6).