Gastric Mucosal Viability Assessment Using 99mTcO4 in a Case of Pure Esophageal Atresia After Isoperistaltic Gastric Tube Replacement.

ABSTRACT: Gastric surface mucosal cells are responsible for the uptake and secretion of 99mTcO4, a feature that has been used in imaging heterotopic gastric mucosa. We used the same principle to look for gastric mucosal viability in this case of pure esophageal atresia admitted for cervical stomal closure after a previous isoperistaltic gastric tube (IGT) replacement procedure. 99mTcO4 scintigraphy was done after encountering a failure to maneuver the esophagoscope through the IGT. The study was helpful in assessing the loss of gastric mucosal viability in an intervening segment of the IGT.

Isolated Lymph Node Amyloidosis: Response Assessment to Chemotherapy on Serial 18F-FDG PET/CT Scans.

Amyloidosis is a disorder resulting from the deposition of fibrillary protein in the extracellular tissue and can be classified into primary, secondary, familial, and senile types. Isolated lymph node amyloidosis without any other organ involvement is very rarely seen in clinical parlance, and diagnosis remains very challenging owing to nonspecific imaging findings. We present a case of 50-year-old man with lymphadenopathy, which was later confirmed to be amyloidosis on biopsy and serum-free light chain assay with efficacious use of F-FDG PET/CT for response assessment to bortezomib, cyclophosphamide, and dexamethasone.

Response Assessment of Recurrent Extragastrointestinal Stromal Tumor of the Urinary Bladder to Imatinib: Findings on Serial 18F-Fluorodeoxyglucose Positron Emission Tomography-Computed Tomography Scans.

Extragastrointestinal stromal tumors (EGISTs) are rare mesenchymal tumors occurring outside the gastrointestinal tracts that have similar histological and immunohistochemical characteristics similar to those of gastrointestinal stromal tumors. EGISTs involving the urinary bladder are extremely rare tumors with very few reports mentioned in the literature. We present a case of a 48-year-old man, known case of biopsy-proven EGIST of the urinary bladder that presented with recurrence after partial cystectomy and 18F-fluorodeoxyglucose positron emission tomography-computed tomography scans documenting the response assessment of the recurrent tumor to imatinib.

18F-Fluorodeoxyglucose Positron Emission Tomography-Computed Tomography in Response Assessment of Perivascular Epithelioid Cell Tumor of the Pelvic Cavity to Irinotecan and Temozolomide.

Perivascular epithelioid cell tumors (PEComas) are a rare variety of mesenchymal tumors composed of distinctive cells that show a focal association with blood vessel walls and usually express melanocytic and smooth muscle markers. We present a case of 38-year-old male, diagnosed with PEComa of the pelvic cavity who underwent serial 18F-fluorodeoxyglucose positron emission tomography-computed tomography scans for the assessment of response to the chemotherapeutic combination of irinotecan and temozolomide.