[Magnetic resonance imaging and bone scintigraphy in bone metastasis detection: a comparative study]

Area of Science:

• Oncology
• Radiology
• Diagnostic Imaging

Background:

• Bone scintigraphy offers high sensitivity but lower specificity for neoplastic lesions.
• Magnetic resonance imaging (MRI) is an established noninvasive method with high diagnostic specificity.
• Comparing these imaging modalities is crucial for accurate bone metastasis detection.

Purpose of the Study:

• To correlate bone scintigraphy and MRI in detecting spinal and pelvic bone metastases.
• To evaluate the diagnostic capabilities of both methods in specific anatomical regions.
• To determine the complementary role of MRI in cases with negative bone scintigraphy findings.

Main Methods:

• 123 patients underwent both bone scintigraphy and 1.5 T MRI of the spine and pelvis.
• Scans were analyzed regionally (cervical, thoracic, lumbar, pelvic).
• 585 matched regions were statistically compared between the two modalities.

Main Results:

• A significant overall correlation was found between bone scintigraphy and MRI findings.
• Significant correlation was observed in most regions, excluding the cervical spine.
• The cervical spine showed a low degree of correlation between the two methods.

Conclusions:

• Bone scintigraphy and MRI are complementary for bone metastasis detection due to high mutual correlation.
• MRI's advanced capabilities can enhance the interpretation of negative bone scintigraphy, particularly for solitary or diffuse lesions.
• Future advancements in both bone scintigraphy (SPECT, SPECT-CT) and MRI (WB-MRI, diffusion MRI) promise further improvements in bone metastasis detection.