Q.All are true regarding osteoid osteoma of vertebral
spine except
a. The most common locations in the spine -- the lumbar
region (59%)
b. Osteoid osteomas involve the posterior elements in 75% of
cases.
c. presence of the
nidus (less than 1.5 cm)
d. focally “hot” on bone scan
e. no enhancement of
nidus
ANS.---e
Plain films show a lucent nidus in classic cases . The size of the
nidus is less than 1.5 cm (if greater than 1.5 cm, the lesion would be
classified as an osteoblastoma),. The nidus is surrounded by sclerotic bony
reaction
The administration of gadolinium,
like that of iodinated contrast material, causes intense enhancement within the
very vascular nidus. This enhancement may help not only to localize the nidus,
but also to differentiate it from a nonenhancing lytic lesion such as Brodie's
abscess .
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