Corkscrew sign - describes the spiral appearance of the distal duodenum and proximal jejunum in the setting of midgut volvulus on contrast studies. In patients with congenital malrotation of the midgut, the distal duodenum and proximal jejunum do not cross the midline and instead pass inferiorly. These loops are predisposed to twist on their shortened mesentery creating the classic corkscrew appearance of midgut volvulus.
- learn how to identify the early signs of an MCA infarct on CT. What is the hyperdense MCA sign?
- learn how to diagnose this important surgical emergency with both CT and ultrasound. How thick is too thick?
- learn the classic appearance of an extradural hematoma and the simple rules that can help distinguish it from subdural blood.
- learn the typical ultrasound and CT features of cholecystitis and how to identify gallstones. What gallbladder wall thickness is considered too thick?
- learn how to recognize the 5 different types of pulmonary lobar collapse, an essential skill for any clinician. Which is the hardest one to detect? Collapse of which lobe will obscure the left hemi-diaphragm?