Shares clinical and histological features with OO
Histologically similar to OO, but the nidus is more than 15 mm
Unlike OO, these do not cause severe pain, relieved by aspirin. Instead they cause dull aching pain or may be asymptomatic
Male: 2:1
Most common site - spine
Most common in 2-3 decade
Plain film:
More than 2 cm
Osseous expansion
May have soft-tissue component
CT:
largely lytic with osseous matrix
MR:
Low-to-int on T1
Int-to-high on T2
Enhance with Gd
Bone scan:
Marked uptake
OB of spine:
All sites equal
OB of rib:
Rare
Well defined, geographical, lytic lesion, slight expansion, sharp sclerotic margin
Reference:
1. Hughes et al. Benign primary tumours of the ribs. Clin rad (2006): 61:314-322
2. Rodallec MH et al. Diagnostic Imaging of Solitary Tumors of the Spine: What to Do and Say. RadioGraphics 2008;28:1019-1041
