Early experience with PET scanning in thoracic tumours

Area of Science:

• Oncology
• Nuclear Medicine
• Radiology

Background:

• Positron emission tomography (PET) is an imaging technique utilizing the metabolic properties of lesions.
• This study assesses the utility of PET scans in diagnosing thoracic malignancies, particularly in cases with multiple lesions or unclear diagnoses.

Purpose of the Study:

• To evaluate the contribution of PET scans in identifying and characterizing thoracic malignancies.
• To assess the accuracy of PET scans in staging known intrathoracic tumors and identifying metastatic spread.

Main Methods:

• PET scans using 2-18F-fluorodeoxyglucose (FDG) were performed on 41 patients.
• Patients were categorized into groups based on diagnosis: primary intrathoracic malignancy, evaluation of lung metastases, characterization of undiagnosed chest pathology, and assessment of extrathoracic spread.

Main Results:

• PET demonstrated a sensitivity of 81.2% and specificity of 92.3% for primary thoracic malignancy.
• The accuracy of PET in confirming metastatic disease to the chest was 73%.
• PET accurately characterized unknown pathology but yielded a false positive in a case of chronic inflammatory disease.

Conclusions:

• PET is a valuable imaging tool for evaluating patients with thoracic tumors.
• While infection can lead to false positive results, PET's diagnostic capabilities for thoracic malignancy are significant.