Incidental Diagnosis of a Large Retroperitoneal Urine Accumulation (Urinoma) on an 18F-FDG PET/CT Scan Performed for Primary Staging of Urothelial Carcinoma

Incidental “Urinoma” in 18F-FDG PET/CT Scan

¹⁸F-FDG PET/CT scanning was performed for the primary staging of a 47-year-old man with urothelial carcinoma. The patient underwent biopsy by ureteroscopy 15 days ago and the PET images revealed ¹⁸F-FDG accumulation in the right retroperitenal region, compatible with an “urinoma”.

FDG PET/CT Demonstrated Precursor B-cell Lymphoblastic Lymphoma in a Pediatric Patient With Hemophilia B

A 4-year-old boy with history of hemophilia B presented with increasingly enlarged scalp masses. Although they were initially thought as hematomas, unresponsiveness to the therapy lead to suspicion of malignancy, which prompted FDG PET/CT. The FDG PET/CT images demonstrated increased FDG uptake in the scalp masses and cervical lymph nodes. The pathology from the left scalp mass and the left cervical lymph nodes revealed precursor B-cell lymphoblastic lymphoma.

Concurrent Pancreatic Metastasis From Lung Adenocarcinoma and Primary Cholangiocarcinoma on FDG PET/CT Imaging

A 67-year-old man with a history of left upper lobe resection of poorly differentiated adenocarcinoma 1 year ago underwent FDG PET/CT for restaging. The images demonstrated a round cystic lesion with peripheral FDG uptake and centrally photopenic region. Additional focus of increased activity was detected in the left lobe of the liver. The patient underwent the Whipple and partial hepatectomy. The surgical pathology demonstrated concurrently the metastasis to the pancreas from the lung adenocarcinoma and a primary moderately differentiated cholangiocarcinoma.