What is CT or “Virtual Colonoscopy”? Optimal performance of MDCT Colonoscopy (CTC) requires thin-section (2-3 mm) images using a low dose technique with additional dedicated CT colonography software. Typical CT scan time is 5-7 seconds and both prone and supine images are obtained. Bowel preperation requires catharisis usually with magnesium citrate or sodium phosphate. The …
Which examination is better for diagnosing acute appendicitis? The sensitivity and specificity of CT is slightly superior to that of US, and CT is better at demonstrating both a normal appendix and the extent of adjacent inflammatory changes. The disadvantages of CT are higher cost and the use of ionizing radiation and contrast material. US …
Best Diagnostics examination for acute appendicitis Read More »
CT and US findings of acute appendicitis US: A distended (> 6 mm), noncompressible appendix with or without an adjacent fluid collection, an appendicolith, peritoneal fluid, abnormal flow in the wall of the appendix and a focal mass representing a phlegmon or abscess. MDCT: The hallmark findings are a distended (> 6 mm), thick-walled appendix with abnormal …
Optimal radiographic work up of diverticulitis MDCT is more than 95% accurate in the diagnosis of diverticulitis. It is superior to other modalities because it directly depicts the severity of the pericolic inflammation and the full intraperitoneal or retroperitoneal extension. It is more sensitive than a barium study in detecting abscesses and fistulas. The CT …
What are the causes of large bowel wall thickening on MDCT? Wall thickening is present in numerous conditions, including Crohn’s, ischemic colitis, pseudomembranous colitis, radiation colitis, neutropenic colitis, and infectious (cytomegalovirus or Campylobacter ) colitis. On CECT, wall thickening can present either as homogeneous enhancing soft-tissue density or as concentric rings of high attenuation from hyperemic enhancement …
How is MDCT used to evaluate the large bowel? Optimal evaluation of the colon requires bowel preparation and luminal distention with rectal contrast or air to evaluate the true wall thickness. Normal wall thickness of a distended colon is smaller than 4 mm. The addition of IV contrast facilitates the evaluation of the bowel wall …
What is the significance of entero enteric intussusception in adults? Entero-enteric intussusception is usually considered incidental in adults when found on MDCT if there is no proximal bowel dilatation and if the intussusception is less than 3.5 cm in length. Intussusceptions are easily defined by the invaginated, low-density mesenteric fat situated between the higher density …