Atypical periosteal osteoid osteoma: a case report

Abstract

Osteoid osteoma is a benign osteoblastic tumor usually seen in adolescent and young males. In the paediatric age group, since the history may be difficult to elicit, there are often problems in early diagnosis. The author reports an unusual presentation of osteoid osteoma in a ten-year-old girl, which could not be diagnosed by conventional X-rays and CT scan.

Figure 1

X-ray of the left ankle showing periosteal lesion with thin outer shell (white arrow heads).

Figure 2

CT scan showing the same lesion as in the X-ray, with doubtful calcification inside(white arrow head).