Page 429 - First Aid for the USMLE Step 1 2020, Thirtieth edition [MedicalBooksVN.com]_Neat
P. 429
Gastrointestinal ` gastrointestinal—PatHology Gastrointestinal ` gastrointestinal—PatHology seCtion iii 385
Malrotation Anomaly of midgut rotation during fetal
A development improper positioning of bowel Liver
(small bowel clumped on the right side) A , Stomach
formation of fibrous bands (Ladd bands). Ladd bands
Stomach
Can lead to volvulus, duodenal obstruction.
Small
Small bowel bowel
Colon
Intussusception Telescoping A of proximal bowel segment into May be associated with IgA vasculitis (HSP),
A a distal segment, commonly at the ileocecal recent viral infection (eg, adenovirus; Peyer patch
junction. Most commonly idiopathic, but may hypertrophy creates lead point).
be due to lead point.
Compromised blood supply intermittent,
severe, abdominal pain often with “currant
jelly” dark red stools.
Majority of cases in infants, unusual in adults.
Most common pathologic lead point:
Children—Meckel diverticulum
B
Adults—intraluminal mass/tumor
On physical exam, patient may draw their legs
to chest to ease pain, sausage shaped mass on
palpation.
Imaging—Ultrasound/CT may show “target
sign.” B
FAS1_2019_09-Gastrointestinal.indd 385 11/7/19 4:42 PM
