Fig. 16
From: Pitfalls in the diagnosis of common benign bone tumours in children
Osteoid osteoma of the left talar neck: Frontal (a) and lateral (b) X-rays of the left ankle: large round sclerotic fragment within an osteolytic cavity (arrows); no surrounding reactive osteosclerosis is identified. c Sagittal T1-weighted MRI: intense bone oedema surrounding the lesion. d Sagittal T2-weighted MRI: an intense inflammatory reaction is identified within the ankle joint. e CT, sagittal reconstruction: confirmation of the large nidus, entirely filled by the sclerotic fragment and with almost no surrounding osteosclerosis