PMC2933728_01
X-ray of the thigh showing only sclerosis
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No obvious nidus was identifiable [Figure 1].
CT of the thigh outlines sclerosis, but not the nidus
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The CT scan of the right lower limb with a bone window could only outline the sclerosis, but not the nidus [Figure 2].
Bone SPECT showing focal uptake of the nidus
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SPECT acquisition revealed a focal avid uptake in the lower shaft of the right femur [Figure 3].
X-Ray of the right leg showing sclerosis on the medial aspect of the right tibia
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SPECT acquisition revealed the focal avid uptake of the nidus localized to be anterior in the three-dimensional reconstructions of the coronal, sagittal, and axial planes [Figure 4]. Surgical excision was done by an anteriomedial approach and the entire lesion was resected.
PMC2933728_02
CT of both legs identified sclerosis, but nidus is indefinable
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A plain radiograph of the right leg showed a large, diffuse and intense sclerosis on the medial aspect of the right tibia with no periostial reaction [Figure 5].
SPECT showing central active nidus with decremental activity toward the periphery, typical of an osteoid osteoma
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A CT scan of both legs in the bone window also identified the sclerosis with nidus as being indefinable [Figure 6].