Nordic Forum - Trauma & Emergency Radiology. Bowel Obstruction: Imaging Update
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1 Nordic Forum - Trauma & Emergency Radiology Bowel Obstruction: Imaging Update Borut Marincek Institute of Diagnostic Radiology University Hospital Zurich, Switzerland Acute Abdomen Bowel Obstruction
2 Bowel Obstruction = 20% of hospital admissions for acute abdomen Small bowel obstruction (SBO) (80%) Etiologies (Miller, Am J Surg 2000): Adhesions (74%) Crohn disease (7%) Neoplasias (5%) Other: abdominal wall & internal hernias, intussusception, gallstone, hematoma, bezoar Large bowel obstruction (LBO) (20%) Carcinoma (60%, most frequently sigmoid) Volvulus (sigmoid > cecum) Other: diverticulitis, intussusception, endometriosis, radiation colitis Bowel Obstruction: Four Relevant Questions 1. Is mechanical obstruction present? DDx: adynamic ileus (laparotomy, pancreatitis, peritonitis, mesenteric ischemia, neuroleptics, opiates) 2. Site (small bowel / large bowel)? 3. Cause? 4. Any complications? Simple (wall viability not compromised) or strangulation obstruction (compromised vascular supply intestinal ischemia)? Urgent surgery or conservative management?
3 Bowel Obstruction: Traditional Role of Imaging Abdominal Plain Film (APF) vs CT Sensitivity (%) Bowel obstruction Urolithiasis Pancreatitis Appendicitis Pyelonephritis Diverticulitis Intraabdominal foreign body APF (N=871) CT (N=188) (Ahn, Radiology 2002)
4 Bowel Obstruction: APF vs CT APF: presence of bowel obstruction CT: site & cause of bowel obstruction MDCT: coronal reformations in addition to transverse views enhance confidence in diagnosis of SBO (Jaffe, Radiology 2006) APF: rarely findings of ischemia or infarction when strangulation present CT: 95% NPV exclusion of strangulation (Balthazar, Radiology 1997) CT instead of APF SBO Kidney-TPL 1 month ago
5 SBO: Multiple Postoperative Adhesions Kidney-TPL 1 month ago SB: distended (>2.5 cm) & collapsed loops No mass at transition zone adhesive SBO: adhesive bands unidentified on CT (diagnosis of exclusion) SBO: Multiple Postoperative Adhesions Ventral incisional hernia; SB faeces sign (phytobezoar) = indicator of SBO when associated with SB dilatation
6 SBO: Crohn Disease Crohn disease: typically partial obstruction Terminal ileum: wall thickening & layering enhancement active disease SBO: Neoplasia Circumferential adenocarcinoma distal ileum curved MPR
7 SBO: Incarcerated Femoral Hernia Incarceration irreducible hernia (irreducible sac of jejunal loop) Incacerated hernia may strangulate, clinical diagnosis difficult in obese patients SBO: Incarcerated Obturator Hernia Obturator hernia f:m= 5:1 7th-8th decade of life
8 SBO SBO: Incarcerated Ventral (Paraumbilical) Hernia Paraumbilical hernia: Related to diastasis of rectus abdominis muscle Risk factors: multiple pregnancies, obesity High prevalence for incarceration & strangulation
9 SBO: Incarcerated Ventral Incisional Hernia 10 days after abdominal hysterectomy SBO: Ventral Incisional Hernia Multiple laparotomies after resection of sigmoid colon Incarceration?
10 SBO: Ventral Incisional Hernia No incarceration (reducible hernia) Abdominal Wall & Internal Hernias Abdominal wall: herniation of viscera through defect in abdominal wall (inguinal, femoral, ventral, lumbar, obturator, incisional) 95% visible or palpable CT for detection of unsuspected sites, in obese patients Internal: less common, herniation of viscera through developmental or surgically created defect of peritoneum / omentum / mesentery diagnosis always based on radiology
11 SBO: Internal Hernias A paraduodenal B foramen of Winslow C intersigmoid D pericecal E transmesenteric F retroanastomotic (Martin, AJR 2006) Classic older literature: paraduodenal most common, pericecal second most common Increasing incidence of transmesenteric, transmesocolic & retroanastomotic new surgical procedures (Roux-en-Y loop in liver TPL & gastric bypass) SBO: Pericecal Hernia
12 SBO: Pericecal Hernia SBO: Retroanastomotic Hernia After Gastric Bypass Mesenteric swirl best single predictor (Lockhart, AJR 2007)
13 SBO: Intussusception Mesenteric fat & vessels in bowel lumen ( bowel-within-bowel appearance ) Lead point: jejunal melanoma metastasis Subdiaphragmatic melanoma metastasis, left renal cyst SBO: Diagnosis?
14 SBO: Diagnosis? 1. Small bowel tumor? 2. Impacted gallstone? 3. Intussusception? 4. Bowel ischemia? SBO: Diagnosis? 1. Small bowel tumor? 2. Impacted gallstone 3. Intussusception? 4. Bowel ischemia?
15 SBO: Impacted Gallstone Rigler Triad in gallstone ileus: SBO, pneumobilia, ectopic gallstone Bowel Obstruction = 20% of hospital admissions for acute abdomen Small bowel obstruction (SBO) (80%) Etiologies (Miller, Am J Surg 2000): Adhesions (74%) Crohn disease (7%) Neoplasia (5%) Other: external/internal hernia, intussusception, gallstone, hematoma, bezoar Large bowel obstruction (LBO) (20%) Carcinoma (60%, most frequently sigmoid) Volvulus (sigmoid > cecum) Other: diverticulitis, intussusception, endometriosis, radiation colitis
16 LBO: Annular Sigmoid Carcinoma Rectal contrast = key for LBO diagnosis Fecal Impaction (Coprostasis)? (61 yo, m)
17 Decompensated LBO (61 yo, m) Colon distended >6 cm, cecum largest Adenocarcinoma transverse colon Ischemic distention colitis of cecum LBO: Fecal Impaction (Coprostasis)
18 LBO: Fecal Impaction (Coprostasis) Most commonly in laxative abusers, psychiatric patients, severe generalized atherosclerosis / cerebral sclerosis High Grade LBO: Diverticulitis or Carcinoma? Sigmoid diverticulitis Findings typical of diverticulitis: Long segment involved (>5 cm) Pericolic inflammation Symmetric wall thickening (75%) Findings typical of carcinoma: Short segment involved Pericolic lymph nodes
19 LBO: Sigmoid Volvulus Northern exposure sign (Javors, AJR 1999) Inverted U configuration LBO: Cecal Volvulus CT whirl sign indicative of volvulus
20 LBO: Endometriosis Rectosigmoid & cecum Cecal perforation LBO: Sigmo-Sigmoid Intussusception Bowel within bowel, lead point = polyp (adenocarcinoma T2N0)
21 LBO: Radiation Ovarian carcinoma, surgery & radiotherapy 23 yrs ago: Ischemic radiation colitis of rectosigmoid Complication of Bowel Obstruction: Ischemia Mechanisms: Strangulation (predominantly venous disease) Prestenotic overdistension CT findings: Bowel wall thickening >3 mm (non-specific) Bowel distention: interruption of peristaltic activity Target sign : alternating hypo- / hyperdense layers submucosal edema / hemorrhage Bowel wall non-enhancement specificity 96% (Taourel, Radiology 1996) Pneumatosis intestini & portomesenteric gas Mesenteric edema, ascites
22 SBO: Strangulation Ischemia Appendectomy & cholecystectomy 54 yrs ago Segmental ischemia & infarction of jejunum secondary to adhesive band SBO: Strangulation Ischemia Appendectomy 1 yr ago Venous ischemia of ileum secondary to adhesive band
23 SBO: Strangulation Ischemia Appendectomy & cholecystectomy several yrs ago CT whirl sign : strangulating SB volvulus ischemia & infarction of jejunum secondary to adhesive band LBO: Overdistension Ischemia LBO secondary to carcinoma sigmoid colon T3N0; synchronous carcinoma ascending colon T3N2 Intraoperatively spontaneous perforation of overdistended right colon stercoral peritonitis
24 Bowel Obstruction: Conclusions CT instead of APF for early diagnosis (exception: sigmoid volvulus) MDCT: MPR improves visualization of transition prestenotic / poststenotic bowel better determination of site and cause of obstruction MDCT: improved visualization of bowel loops in suspected bowel wall ischemia secondary to strangulation or prestenotic overdistension
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