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Ultrasound Of: Appendicitis Intussusception Pyloric Stenosis

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Ultrasound Of: Appendicitis Intussusception Pyloric Stenosis Ultrasound of: Appendicitis Intussusception Pyloric Stenosis Andrew Phelps MD Assistant Professor Pediatric Radiology UCSF Benioff Children’s Hospital No Disclosures Take Home Message Appendicitis occurs at any age. Intussusception and Pyloric Stenosis have specific age ranges. Outline 1) Appendicitis 2) Intussusception 3) Pyloric Stenosis Outline 1) Appendicitis 2) Intussusception 3) Pyloric Stenosis Appendicitis Age Range Any! Scanning Technique 10 minutes to find Appendix Start anterior to the iliac vessels. Most often this is where you will find the appendix. Look from All Directions Normal Appendix Normal Appendix mobile tubular blind-ending no peristalsis < 6 mm diameter Normal Appendix “Donut” Stool “Train Tracks” Free Fluid Appendix Fakeouts Ileum Mimicking Appendix Look for bumpy folds. Ureter Mimicking Appendix Sagittal Transverse Ovarian Vein Mimicking Appendix Appendicitis Appendicitis 11 mm, focally tender Appendicitis Color flow sometimes helpful. Appendicitis Look for inflamed echogenic fat. Outline 1) Appendicitis 2) Intussusception 3) Pyloric Stenosis Intussusception Age Range 4 months – 4 years > 4 years: Worry about tumor. Intussusception Technique 5 minutes to find intussusception Start in RLQ. Scan all 4 quadrants. Normal Bowel Normal Spine Normal Psoas Muscles Normal Small Bowel Marbelized mucosa Normal Terminal Ileum AIR/ STOOL Normal Ileocecal Valve …resembles pylorus Normal Ascending Colon Speckles from stool/gas. Intussusception 2 year old with colicky pain. Intussusception 7 year old, VPS, emesis. Intussusception in 7 year old …from lymphoma! Small Bowel – Small Bowel Intuss. Presumed clinically insignificant. 2yo abdominal pain. Central Abd Inverted Meckel’s Small Bowel Intussusception Small Bowel Obstruction Intussusception Fakeouts Normal Ileocecal Valve IC valve normally herniates slightly into cecum Inflamed Ileocecal Valve Sagittal Transverse A real intussusception wouldn’t be this short. Ileum Edema after Intussusception Reduction Colitis Mimicking Intussusception No With Compression Compression Outline 1) Appendicitis 2) Intussusception 3) Pyloric Stenosis Pylorus Stenosis Age Range 3 weeks – 6 months Pylorus Scanning Technique Use liver as window to pylorus. Place patient right-side down if need to get gas out of the way. Normal Pylorus Normal Pylorus Muscular layer is hypoechoic. Py St Du Normal Pylorus Gas in duodenal bulb confirms correct location. Py Du Pyloric Stenosis Pyloric Stenosis Pyloric Stenosis Normal Pylorus 4 mm thickness, 16 mm length 3 weeks – 6 months Pyloric Stenosis Longitudinal Transverse Pyloric Stenosis Fakeouts Incorrect Measurements Incorrect Measurements 7 x 15 mm 3 mm Correct Measurements 7 x 15 mm 3 mm To exclude pylorospasm, wait for emptying. Outline 1) Appendicitis 2) Intussusception 3) Pyloric Stenosis Take Home Message Appendicitis: any age Intussusception: 4 mo – 4 years Pyloric Stenosis: 3 wk – 6 mo Questions Question 1 What is the appendix diameter cutoff for appendicitis? a. >5 mm b. >6 mm c. >7 mm d. >8 mm Question 1 What is the appendix diameter cutoff for appendicitis? Ref: Trout AT, Sanchez R, Ladino-Torres a. >5 mm MF, Pai DR, Strouse PJ. A critical b. >6 mm evaluation of US for the diagnosis of pediatric acute appendicitis in a real-life c. >7 mm setting: how can we improve the diagnostic value of sonography? d. >8 mm Pediatr Radiol. 2012 Jul;42(7):813-23 Question 2 What do you need to worry about in a 10 year old with intussusception? a. abuse b. infection c. inflammatory bowel disease d. tumor Question 2 What do you need to worry about in a 10 year old with intussusception? a. abuse b. infection c. inflammatory bowel disease d. tumor Ref: Zhang Y, Dong Q, Li SX, Ren WD, Shi B, Bai YZ, Zhang SC, Zheng LQ. Clinical and Ultrasonographic Features of Secondary Intussusception in Children. Eur Radiol. 2016 Apr 5 Thank you! .
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