Bat wing = Pulm edema. Honeycomb = ILD. Meniscus sign = Pleural effusion.

EDH = biconvex (MMA). SDH = crescent (bridging veins). SAH = star sign.

Non-ionic safer. CIN prevention = hydration + NAC. Gadolinium for MRI.

Coffee bean sign = sigmoid volvulus. Double bubble = duodenal atresia. Target sign = intussusception.

Tc-99m = most used isotope. PET = FDG uptake in metabolically active tissue. Thyroid = I-131.