Osteoid osteoma

Case contributed by Dr Ahmed El Husseiny

Presentation

Right leg pain for a few months, exaggerated at night with no history of trauma.

Patient Data

Age: 10 years
Gender: Male
X-ray

Plain radiograph of the right leg shows focal cortical thickening and sclerosis of the lateral aspect of the proximal tibial shaft.

CT

Axial and coronal CT images show a small radiolucent nidus at the lateral aspect of the proximal tibial shaft with a central sclerotic dot, surrounded by reactive bone sclerosis and focal cortical thickening.

MRI

MRI demonstrates a small focus of of abnormal low signal on T1 and STIR images at the lateral aspect of the proximal tibial shaft surrounded by intense marrow edema signal.

Case Discussion

Plain X-ray, CT and MRI findings together with the clinical presentation are highly suggestive of osteoid osteoma.

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