PMC5433411_01
Normal findings at plain radiography.
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fig1
Left knee radiographs showed no abnormalities (Figure 1).
T2 weighted images (a and c) showed the hypointense lesion (yellow arrow) located at tibia anteromedial plateau with ill-defined bone marrow edema; (b) T1 weighted image showed the well-defined bordered hypointense lesion (yellow arrow).
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fig2
Second MRI, which is recent, showed a nidus-like view with bone marrow edema (Figure 2).
Coronal (a), axial (b), and sagittal (c) CT images showed the perinidal sclerosis with centrally calcified nidus (yellow arrow) consistent with an osteoid osteoma.
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fig3
CT scans showed a small radiolucent zone, surrounded by reactive circumferential sclerosis, which is typical for osteoid osteoma (Figure 3).
Intraoperative photo that shows surface discoloration over the lesion.
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fig4
Intervention area was detected after the discolored and irregular lesion surface was marked (Figure 4).
Photomicrograph of the lesion revealing abundant osteoid formation characteristic of an osteoid osteoma [H&E, x4 obj. (a), x10 obj. (b)].
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fig5
Histopathological examination of the surgically removed lesion confirmed the initial diagnosis of osteoid osteoma (Figure 5).