[Diagnostic imaging of bone metastases]

Area of Science:

• Oncology
• Radiology
• Diagnostic Imaging

Background:

• Skeletal metastases are the most common malignant bone tumors, frequently occurring in the spine and pelvis due to active bone marrow.
• Pain is a primary symptom, but many bone metastases are asymptomatic, posing diagnostic challenges.
• Pathological fractures represent severe complications of skeletal metastases.

Purpose of the Study:

• To present a diagnostic algorithm for skeletal metastases tailored to both symptomatic and asymptomatic cancer patients.
• To outline distinct diagnostic pathways based on patient symptomatology and imaging findings.

Main Methods:

• Retrospective review of clinical charts from 100 cancer patients (mean age 63 years).
• Utilized conventional radiography, bone scan, CT, and MRI for staging and diagnosis.
• Patients were categorized into asymptomatic (Group A) and symptomatic (Group B) groups.

Main Results:

• Breast cancer was the most common primary lesion (51%), followed by colon (30%) and lung (7%).
• Lytic bone lesions were the most frequent radiographic pattern (52%).
• The study established distinct diagnostic approaches for asymptomatic versus symptomatic patients.

Conclusions:

• Bone scintigraphy is the preferred initial imaging technique for asymptomatic patients with suspected skeletal metastases.
• For symptomatic patients or those with positive bone scans, radiography and CT are used, with MRI recommended before biopsy for better tissue differentiation.
• While sensitive, bone scintigraphy and MRI have limitations in specificity, necessitating careful interpretation and potentially further investigation like bone biopsy.