Abstract

Positron emission tomography/computed tomography (PET/CT) with fluorodeoxyglucose (FDG) is widely used in lung cancer staging and follow-up. I report a case of a 63-year-old male with biopsy-proven lung adenocarcinoma and known brain metastases. Initial PET/CT performed at 60 minutes post-injection failed to clearly demonstrate the intracranial lesions due to physiological brain uptake. A delayed scan at 120 minutes significantly improved the lesion-to-background contrast and revealed multiple FDG-avid metastatic foci. This case highlights the clinical value of delayed PET/CT imaging in improving the diagnostic accuracy of intracranial metastases in lung cancer patients.

Key words: Delayed Imaging, PET/CT, Brain Metastases, Lung Cancer, FDG Uptake, Oncology Imaging