GI TRACT
INTRODUCTION
ESOPHAGUS
RSNA ESOPHAGEAL AND CUTANEOUS MANIFESTATIONS.pdf
SMALL BOWEL
FUNDAMENTALS
ACUTE PATHOLOGY
RSNA ACUTE SMALL BOWEL ENTITIES.pdfDILATATION
WALL THICKENING
DUODENUM SPECIFIC PATHOLOGY
BOWEL OBSTRUCTION
SBO.pdfENTERITIS / COLITIS
INFLAMMATORY BOWEL DZ
MR ENTEROGRAPHY IN CROHN'S DZ
SB TUMORS
VOLVULUS
RSNA COLONIC VOLVULUS.pptxAPPENDIX
APPENDICITIS
The tip of the appendix is typically the first site of inflammation and appendiceal perforation.
Modalities:
NECT: sometimes adequate if patient has ample intraperitoneal fat
CECT: Can visualize early appendicitis via increased mural enhancement. Helps to diagnose perforation w nonenhancement of necrotic portion of appendiceal wall as well as inflammed bowel and abscesses.
Oral contrast: can be helpful in identifying the appendix
Complications:
Gangrene and perforation, abscess formation.
Peritonitis, septiciemia
Pyelophlebitis or superior mesenteric or portal vein +/- hepatic abscess
Dropped appendicolith w associated abscess.
TX
Surgery: nonperforated or minimal perforation.
Percutaneous drainage: well-localized abscess >3 cm
Abx therapy: periappendiceal ST inflammation, no abscess.
CT: abnormal mural enhancement of distended appendix.
Distended, thick-walled noncompressible appendix >/= 7mm
Periappendiceal fat stranding
+/- wall enhancement
Necrotic wall may show no enhancement.
+/- Appendicolith (15-40%)
+/- periappendiceal abscess or phlegmon.
COLON
MECKELS DIVERTICULITIS
Rule of 2s
seen in 2% of population
Located w/n 2 feet of ileocecal valve
Length of 2 inches
Sx usually before age 2
2 main complications in adults: diverticulitis (20%) and intestinal obstruction (40%)
Diverticulitis:
blind ending pouch containing fluid, air, or particulate matter. Mural thickening of diverticulum and adjacent small bowel. Mesenteric fat infiltration and fluid; extraluminal gas and LAD in some cases.
Attached band tethering Meckel diverticulum to umbilicus or mesentery may help w dx.
EPIPLOIC APPENDAGITIS
Hyperattenuating ring
Central dot sign: thrombosed vascular pedicle w/n inflammed epiploid appendage.
OMENTAL INFARCTION
Larger (>3-5 cm) ball of dirty fat adjacent to ascending colon.
SURGERY
RSNA BARIATRIC SURGERY.pdf