The average fetal radiation dose with helical CT is less than that with ventilation-perfusion lung scanning during all trimesters.

Comparison of tumor volumes at serial CT examinations reveals a very wide range of growth rates. Some tumors grow so slowly that biopsy is required to prove they are malignant.

Multi-detector row CT has an accuracy of 91% in the depiction of suspected acute PE when conventional PA is used as the reference standard.

At serial volumetric CT measurements, there was wide variability in growth rates. Some biopsy-proved cancers decreased in volume between examinations.

In patients with severe acute pancreatitis, the percentage of necrosis of pancreatic glandular parenchyma is an important predictor of prognosis. However, little attention has been paid to necrosis of ductal epithelium, which may result in disconnection of the main pancreatic duct. In pancreatic duct disconnection, a viable segment of the pancreatic body or tail is isolated from the gastrointestinal tract; the result is a persistent end fistula, that is, an uncontrolled leak of pancreatic secretions into peripancreatic spaces without communication to the gastrointestinal tract. The authors present their experience with clinical and radiologic follow-up of 85 patients with necrotic pancreatitis who either did (n = 46) or did not (n = 39) have pancreatic duct disconnection at surgery. Confident preoperative diagnosis of a disconnected duct requires both imaging tests (computed tomography or magnetic resonance imaging) and pancreatography. However, not all peripancreatic collections signify ductal disconnection, and imaging has poor accuracy in differentiation between pancreatic and peripancreatic necrosis. Early recognition of disconnected pancreatic duct obviates unnecessary and potentially harmful drainage procedures.