Osteoid osteoma

Case contributed by Dr Angela Byrne

Presentation:

left hip pain

Patient Data:

Age: 10 years
Modality: X-ray

Radiograph of the pelvis and hips of a 10 year old girl, demonstrates a lucency in the region of the greater trochanter on the left, with no convincing soft tissue mass or periosteal reaction. There is however diffuse surrounding sclerosis.

Modality: CT

The lesion and sclerosis are confirmed on CT which demonstrates a sharply demarcated oval lesion, with a central focus of sclerosis.

Modality: Nuclear medicine

Bone scan demonstrates a double density sign, with a focal region of intense uptake, superimposed on a larger area of generalised increase activity.

Case Discussion:

Findings are characteristic of an osteoid osteoma  which was subsequently histologically confirmed.

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