Nocturnal right thigh pain.
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Increased cortical thickness involving the mid femoral shaft on the medial aspect with associated sclerosis and narrow zone of transition.
There is also focal round lucent/lytic lesion within the centre of the sclerotic portion of femur suggestive of nidus of osteoid osteoma.
Findings are compatible with right femoral shaft osteoid osteoma.
CT scan is excellent at characterising the lesion and is the modality of choice. It typically shows a focally lucent nidus within surrounding sclerotic reactive bone. A central sclerotic dot may also be seen.