Related Experiment Videos
Acute osteomyelitis in children: combined Tc-99m and Ga-67 imaging
Insights
Combined bone and gallium scans improve diagnosis of acute osteomyelitis in children when bone scans alone are unreliable. Correlating imaging results is crucial for accurate detection.
Area of Science:
- Pediatric Imaging
- Nuclear Medicine
- Skeletal System Imaging
Background:
- Acute osteomyelitis diagnosis in children can be challenging.
- Technetium-99m methylene-diphosphonate (Tc-99m MDP) bone scans may be unreliable in specific pediatric cases.
- Gallium-67 citrate (Ga-67) imaging is an alternative or adjunct modality.
Purpose of the Study:
- To evaluate the diagnostic value of combined Tc-99m MDP and Ga-67 citrate imaging.
- To assess the accuracy in a pediatric subpopulation with potentially unreliable bone scans for acute osteomyelitis.
Main Methods:
- Retrospective study of 31 children with suspected osteomyelitis.
- Sequential bone scintigraphy (Tc-99m MDP) followed by gallium scintigraphy (Ga-67).
- Analysis of scan results against strict diagnostic criteria for acute osteomyelitis.
Main Results:
- Eight children had confirmed acute osteomyelitis; 23 did not.
- Bone scans identified 5/8 with osteomyelitis but were positive in 10/23 without.
- Gallium scans correctly identified all 8 with osteomyelitis but were positive in 7/23 without.
- Gallium scan specificity decreased for extremity lesions and was affected by fractures or juvenile rheumatoid arthritis.
Conclusions:
- Combined bone and gallium scintigraphy enhances the accuracy of diagnosing acute osteomyelitis in select pediatric patients.
- Both imaging modalities can yield false positives in conditions other than osteomyelitis.
- Clinical correlation of all imaging findings is essential for accurate osteomyelitis detection.
Abstract:
This retrospective study was done to determine the value of combined bone (technetium-99m methylene-diphosphonate) and gallium-67 citrate imaging in selected children with complicated clinical situations. Thirty-one children were evaluated for suspected osteomyelitis by bone scan followed within 4 days by a gallium scan. These 31 children represented a subpopulation in whom the Tc-99m scan is known to be potentially unreliable in diagnosing acute osteomyelitis. Eight children had acute osteomyelitis by strict criteria, while 23 did not. The bone scan successfully identified five of the eight with osteomyelitis but was positive in ten of the other 23. The gallium scan correctly identified all eight with osteomyelitis but was positive in seven of the other 23. The gallium scan was significantly less specific when the suspected lesion was in the extremities compared with central locations; causes of false-positive gallium scans included fracture and juvenile rheumatoid arthritis. Combined gallium and bone scanning increased accuracy of the scintigraphic diagnosis of acute osteomyelitis. Both tests may, however, be abnormal in conditions other than osteomyelitis. These findings emphasize the importance of correlating all imaging studies in detection of osteomyelitis.