BOF 36
Radionuclide bone scan, all are true except:
1-utelizes IV injection of 99mTc-biphsphonate and
detected by a gamma camera
2-early post injection images reflect increased
vascularity as in Paget’s disease or inflamed synovium
3-delayed images reflect increased bone remodelling
process.
4-paticularly useful in the assessment of local
painful skeletal areas with normal or inconclusive plain radiographs
5-extremely useful in the assessment of multiple
myeloma
Answer 5
1-as the isotope is taken by body bones
2-also in primary and secondary bone tumours
3-as the Tc-biphosphonate later localizes to areas of
bone remodelling. These LATE images usually taken after few hours
4-true, the main indication in general
5-false, it depends on the osteoblastic activity which
is inhibited in MM, so it is not useful here, only if complicated by fractures
Remember: although bone scan has a high sensitivity,
it extremely lacks specificity and lacks high anatomical resolution
