Diverticular Disease-Related Colitis

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Diverticular Disease-Related Colitis Diverticular Disease-Related Colitis KEY FACTS Colon TERMINOLOGY ○ Abscess, fistula, perforation • Segmental colitis-associated diverticulosis (SCAD) ○ Exception is Crohn disease-like variant of SCAD that may show mural lymphoid aggregates ETIOLOGY/PATHOGENESIS MICROSCOPIC • Unknown, TNF-α may play role • Chronic colitis-like changes mimicking inflammatory bowel CLINICAL ISSUES disease • Presents with hematochezia, abdominal pain, diarrhea • Ulcerative colitis-like variant shows changes confined to • Median age: 64 years mucosa ○ Range: 40-86 years ○ Diverticulitis may or may not be present in these cases • Predominately involves descending and sigmoid colon (with • Crohn disease-like variant shows mural lymphoid rectal sparing) aggregates • Treatment directed toward diverticular disease suppresses • Changes in both variants confined to segment involved symptoms with diverticulosis coli MACROSCOPIC TOP DIFFERENTIAL DIAGNOSES • Mucosal changes are mild and nonspecific • Ulcerative colitis, Crohn disease, infectious colitis, diversion • Mural changes are related more to underlying diverticulosis colitis, NSAID-associated colitis coli rather than SCAD Diverticular Disease-Associated Colitis Diverticular Disease-Associated Colitis (Left) The mucosa surrounding the openings of diverticula ſt into the colonic lumen is erythematous and granular, consistent with diverticular disease-associated colitis (DDAC) ﬊. (Right) It is not uncommon to find some inflammation or erosions ﬊ around the luminal opening of a colonic diverticulum ſt. To be diagnostic of DDAC, inflammation must involve the mucosa in the interdiverticular region ﬉. Chronic Active Colitis Basal Lymphoplasmacytosis (Left) A chronic colitis pattern of inflammatory infiltrate is seen in both the ulcerative colitis-like and Crohn disease- like variant of DDAC. The mucosal changes are indistinguishable from true inflammatory bowel disease (IBD). (Right) A band of lymphoplasmacytic infiltrate ﬊ is present beneath the base of the crypts ﬇ in the mucosa. The distinction between DDAC and true IBD can only be made by knowing the distribution of disease involvement. 426 Diverticular Disease-Related Colitis Colon TERMINOLOGY Natural History • Clinical course is related to severity of disease Abbreviations • Endoscopic disease severity scoring system has been • Diverticular disease-associated colitis (DDAC) proposed Synonyms • Mild cases may not need any intervention, other than follow-up colonoscopy • Segmental colitis associated with diverticulosis (SCAD) • Severe cases or patients with continued symptoms treated Definitions with antiinflammatory medications or steroids • Chronic colitis involving interdiverticular mucosa in colonic • Resection restricted to patients with severe symptoms segment with diverticulosis unresponsive to medical therapy ○ Histologic findings may mimic ulcerative colitis or Crohn Treatment disease • Options, risks, complications ETIOLOGY/PATHOGENESIS ○ Treatment directed toward diverticular disease may suppress symptoms Exact Pathogenetic Mechanism Unknown – Decrease intraluminal pressure by increasing stool • Immune-mediated injury may play role bulk (high-fiber diet) – Surgical intervention usually dictated by severity of Immunologically Mediated diverticulosis rather than SCAD • Stasis of colonic contents may promote bacterial • Drugs proliferation that acts as trigger for mucosal inflammation ○ Antibiotics for treatment of active diverticulitis • Disproportionate immune response in genetically ○ Oral aminosalicylates and probiotics for mild SCAD susceptible host ○ Immunosuppressives for severe SCAD • Similar to inflammatory bowel disease (IBD), TNF-α has – Sulfasalazine been postulated to play role in pathogenesis of SCAD – 5-aminosalicylic acid May Be Related to Severity of Diverticulitis – Topical steroids • Early mucosal inflammation around opening of diverticula Prognosis into lumen, which then spreads to interdiverticular mucosa • Depends on patient symptoms, severity of disease, and CLINICAL ISSUES response to medical intervention Epidemiology IMAGING • Incidence CT Findings ○ Estimated: ~ 0.36% • Colonic wall thickening in segment involved with • Age diverticulosis and associated luminal narrowing ○ Median: 64 years (range: 40-86 years) • Diverticular abscess, fistula, or perforation may be seen ○ Later age of onset compared to patients with IBD • Sex MACROSCOPIC ○ Equal incidence in both sexes • Ethnicity General Features ○ Geographical differences are related to differences in • Findings related to diverticulosis coli prevalence of diverticulosis coli, which is higher in West ○ Ostia or openings of diverticula on mucosal surface ○ Sac-like outpouchings ± fecaliths Site ○ Peridiverticular abscesses may be present • Most common in sigmoid colon; rare in other segments ○ Bowel wall thickening or perforation depending on • Rectum is typically spared severity of disease Presentation • Findings related to SCAD • Hematochezia ○ Mucosal erythema or granularity involving interdiverticular segments of colonic mucosal surface • Crampy, abdominal pain ○ Erosions or ulcers in severe cases • Diarrhea • Fistula tract formation and intestinal obstruction may be MICROSCOPIC present in cases associated with severe diverticulitis Histologic Features Endoscopic Findings • Chronic colitis-like mucosal changes mimicking IBD • Changes confined to segment involved with diverticulosis ○ Basal lymphoplasmacytosis coli ○ Crypt architectural disarray ○ Colonic mucosa proximal and distal to diverticular segment is normal ○ Paneth cell metaplasia • Patchy areas of erythema or exudate or diffuse mucosal ○ Variable active inflammation with erosion or ulcer granularity • Mucosal and mural changes confined to segment involved with diverticulosis coli; other parts of colon are normal 427 Diverticular Disease-Related Colitis • 2 variants described DIAGNOSTIC CHECKLIST Colon ○ Ulcerative colitis-like variant – Changes confined to mucosa similar to what is seen in Clinically Relevant Pathologic Features ulcerative colitis • Endoscopic and pathologic findings limited to segment – Prominent basal lymphoid aggregates may be seen involved with diverticulosis coli similar to diversion colitis Pathologic Interpretation Pearls – Crypt rupture reaction may be seen ○ Crohn disease-like variant • Inflammation within diverticulum ("diverticulitis") is not – Best thought of as Crohn-like diverticulitis than form considered SCAD of IBD • SCAD is defined by inflammation of flat mucosa between – Seen in resection specimens openings of diverticula (interdiverticular region) into colonic lumen – Mural lymphoid aggregates mimicking Crohn disease present in segment involved with diverticulitis • Inflammation in SCAD shows chronic colitis pattern similar to IBD – Noncaseating granulomas may be present, ± foreign body giant cell reaction SELECTED REFERENCES – Important not to diagnose this as Crohn disease in older patient with no previous history of IBD 1. Kucejko RJ et al: Considerations and changes in the evaluation, management, and outcomes in the management of diverticular disease: the Predominant Pattern/Injury Type diagnosis, pathology, and treatment of diverticular colitis. Clin Colon Rectal Surg. 31(4):221-5, 2018 • Inflammatory, chronic 2. Mann NS et al: Segmental colitis associated with diverticulosis: systematic evaluation of 486 cases with meta-analysis. Hepatogastroenterology. DIFFERENTIAL DIAGNOSIS 59(119):2119-21, 2012 3. Tursi A et al: Segmental colitis associated with diverticulosis: a 5-year follow- Ulcerative Colitis up. Int J Colorectal Dis. 27(2):179-85, 2012 4. Tursi A: Segmental colitis associated with diverticulosis: complication of • Key to diagnosis is recognizing that colitis in SCAD involves diverticular disease or autonomous entity? Dig Dis Sci. 56(1):27-34, 2011 only segment with diverticulosis 5. Tursi A et al: The endoscopic spectrum of segmental colitis associated with • Inflammation above or below segment involved with diverticulosis. Colorectal Dis. 12(5):464-70, 2010 6. Mulhall AM et al: Diverticular disease associated with inflammatory bowel diverticulosis coli suggests infection or IBD as underlying disease-like colitis: a systematic review. Dis Colon Rectum. 52(6):1072-9, etiology 2009 • Rectum is almost always spared in SCAD but involved in 7. Freeman HJ: Natural history and long-term clinical behavior of segmental ulcerative colitis colitis associated with diverticulosis (SCAD syndrome). Dig Dis Sci. 53(9):2452-7, 2008 Crohn Disease 8. Ierardi E et al: Tumour necrosis factor alpha in segmental colitis associated with diverticula. Dig Dis Sci. 53(7):1865-8, 2008 • Also patchy segmental colitis like SCAD 9. Lamps LW et al: Diverticular disease-associated segmental colitis. Clin • Diagnosis of Crohn disease in segment involved with Gastroenterol Hepatol. 5(1):27-31, 2007 diverticulosis coli should be made with great caution 10. Imperiali G et al: Segmental colitis associated with diverticula: a 7-year follow- up study. Endoscopy. 38(6):610-2, 2006 ○ Clinical or radiographic evidence of disease involvement 11. Sultan K et al: The nature of inflammatory bowel disease in patients with beyond diverticular segment favors Crohn disease coexistent colonic diverticulosis. J Clin Gastroenterol. 40(4):317-21, 2006 ○ Terminal ileal or upper GI involvement favors Crohn 12. Koutroubakis IE et al: The spectrum of segmental colitis associated with disease diverticulosis. Int J Colorectal Dis. 20(1):28-32, 2005 13. Peppercorn MA: The overlap of inflammatory bowel disease
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