<prompt> All are USG findings in acute appendicitis except:-Diameter greater than 6 mmNon-compressibleGut signatureAppendicolith  <response>: Acute appendicitis: IOC in children - USG IOC in adults - CECT more sensitive On USG Acute appendicitis appears as blind ending, tubular, non-compressible, aperistaltic structure with luminal diameter or equal to 7mm. Has intact Gut signature - presence of hyperechoic mucosa hypoechoic muscle wall of gut Show AppendicolithFecalith with posterior acoustic shadowing Figure: USG of acute appendicitis. On CECT Appendicular diameter 6mm Lumen of caecum can be seen pointing towards obstructed opening of appendix called Arrow head sign. Thickened inflamed soft tissue at base of appendix - Cecal bar sign. Figure: Cecal bar sign Figure: Arrow head sign 