Nuclide Notes

☢️ Gastric adenocarcinoma intestinal type ☢️ FAPI PET/CT scan shows pyloric concentric mass like wall thickening of intense FAPI uptake with subsequent luminal tapering. Biopsy revealed gastric adenocarcinoma intestinal type.
🗓 Intestinal type gastric tumor is the most common form of gastric adenocarcinoma closely linked with environmental factors and chronic H. Pylori, the other is diffuse type tends to spread in an infiltrative manner causing diffuse wall thickening. Intestinal type tends to grow outwards forming a mass which can be bulky, fungating lesion and usually arises in the lower parts of the stomach.

☢️ Complex trilobulated fusiform aortic aneurysm ☢️ involving the descending thoracic and abdominal aorta. On non contrast enhanced images there is a peripheral crescent with hyperattenuation with hounsfield units (HU) higher than patent lumen. This is highly suggestive of impending rupture of the aortic aneurysm. On contrast enhanced images the density should be higher than adjacent psoas muscle attenuation. High attenuating crescent sign is specific represents acute hematoma or bleeding within either mural thrombosis is aneurysmal wall.