<prompt> A 23-year-old lady presents with acute right sided lower abdominal pain since 4 hours. There is tenderness at McBurneys point. Which investigation is best suited to confirm the diagnosis of appendicitisCT scanPlain X-raySerum ESRMRI abdomen  <response>: Ans. a CT scanRef: Sabiston 20th edition, Page 1299Various investigations done for acute appendicitis: X-ray abdomen erect -- Fecalith can be seen in 5 cases only USG abdomen -- noncompressible appendix sensitivity 78-83, Specificity 83-93. CECT abdomen with only IV contrast -- sensitivity and specificity is high 90-100 -- Thickened appendix 7mm diameter, most accurate imaging used. MRI abdomen -- is 100 sensitive and, 98 sensitive. Used only in pregnant females. Operator dependent. 