Neurology India | Jan-Feb 2009 | Vol 57 | Issue 1 Figure 2: Axial contrast-enhanced T1W MRI (a) shows diffuse enhancement of the wall of the right intra-petrous ICA (arrow). Ethmoid and sphenoid sinusitis is also seen. 3D contrast-enhanced MR angiogram (b) shows long segment narrowing of the right ICA (arrow). The left ICA is normal (black arrow) Cavernous sinus thrombophlebitis causing reversi...

Picture 1. (A) A chest X-ray showing enlargement of the right atrium (RA) (arrow), (B) An echocardiogram showing dilatation of the coronary sinus (CS) (arrow), (C) A multislice computed tomogram showing enlargement of the RA, (D) A multislice computed tomogram showing persistent left superior vena cava (SVC) (arrow) which drained into the RA through the CS. LAD: left atrial dimension, LVDd: lef...

Figure 1a. Contrast enhanced CT demonstrating a small calcified gallstone (arrow) within the gallbladder. 1b+c. Contrast enhanced CT two weeks later. b. A dilated gallbladder with thickened wall, absence of stone, and intrahepatic bile duct dilatation (arrow). 1c. The migrated gallstone (arrow) is seen in the distal CBD. 1d. ERCP demonstrating a filling defect in the distal CBD. 1e. The extract...

We prove a re ned version of Shelah's theorem of the Arrow property. Let Cr(A) be the set of all choice functions de ned on the r-element subsets of a nite set A. Then any non-empty proper symmetric subset D of the set Cr(A) has the Arrow property whenever |A| ≥ 5 and r ≥ 3. We also describe all symmetric sets D ⊂ Cr(A) that have the Arrow property if either r = 2, or r = 3 and |A| = 4.