# Modified Hinchey — Kaiser CT-modified Hinchey classification of acute diverticulitis

> Six-category CT and clinical severity map from stage 0 through IV: mild disease, confined inflammation, local or distant abscess, and generalized purulent or fecal peritonitis. Name this Kaiser modification and keep it separate from original operative Hinchey and WSES CT stages; the code alone does not prescribe treatment.

**Situação:** vigente · **Órgão:** Cólon · **Órgão emissor:** Kaiser et al. / colorectal-surgery practice · **Versão:** Kaiser CT modification (2005); current-care context reviewed through 2026 · **Ano:** 2005

> ⚠️ Uma versão mais nova pode existir (em revisão).

## Procedência e vigência
- Família: léxico
- Tipo de lógica: flat
- Modalidade: CT
- Fonte primária: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/
- Última verificação: 2026-07-24
- Última checagem: 2026-08-12

## Lógica de decisão
Use the complete six-stage Kaiser CT modification, preserve CT-versus-operative truth and clinical physiology, and never import WSES numbering or a management-size threshold into the stage silently.

## Categorias

| Código | Rótulo | Critérios | Conduta | Risco | Localizador | Verificado |
| --- | --- | --- | --- | --- | --- | --- |
| 0 | Stage 0, clinically mild diverticulitis | Kaiser modified Hinchey stage 0 is a clinically mild acute diverticulitis episode with colonic diverticula and with or without colonic wall thickening, without definite pericolic inflammatory reaction, abscess or generalized peritonitis. It is not asymptomatic diverticulosis and must be tied to the acute clinical episode. | For a carefully selected low-risk, immunocompetent patient with mild uncomplicated disease, no systemic inflammatory response and reliable follow-up, current ACG guidance suggests against routine antibiotics. High-risk features, immunocompromise, frailty, vomiting, severe or refractory symptoms, concerning laboratory/imaging findings or unreliable follow-up support antibiotics, closer observation or admission according to the complete clinical assessment. | This is the least anatomically advanced modified category, but it has no universal recurrence or complication probability. In the historical Kaiser cohort, broadly defined mild cases had 13% recurrence; that center-era figure is not a stage-0 individual prediction and does not override immune status, physiology or follow-up reliability. | Tiralongo et al. 2023, PMC10742435, modified Hinchey table, stage 0; Kaiser et al. 2005, PMID 15784040, recurrence results for mild cases; Peery et al. 2026 ACG guideline recommendations for low-risk uncomplicated diverticulitis. | ✓ |
| Ia | Stage Ia, confined pericolic inflammation or phlegmon | Confined pericolic inflammation or phlegmon is present: CT shows colonic wall thickening with inflammatory reaction in the adjacent pericolic fat, without a drainable pericolic/mesocolic abscess, distant abscess or generalized peritonitis. Pericolic gas must be described separately because other named systems encode it differently. | Stable, selected uncomplicated cases may receive supportive outpatient care without routine antibiotics under current ACG criteria. If there is pericolic extraluminal gas, systemic inflammation, immune compromise, frailty or other high-risk features, use antibiotics and close reassessment; WSES specifically suggests a nonoperative antibiotic trial for pericolic gas. No drain is placed without a drainable collection. | Ia generally has lower failure risk than abscess or generalized-peritonitis categories, but the label alone has no calibrated probability. Clinical deterioration, high inflammatory burden, immune compromise and pericolic gas can change risk despite the absence of an abscess; preserve those variables instead of reporting a fixed percentage. | Tiralongo et al. 2023, PMC10742435, modified Hinchey stage Ia table; Sartelli et al. 2020, PMC7206757, pericolic-gas recommendation and WSES scheme; Peery et al. 2026 ACG guideline for selective antibiotic use and high-risk features. | ✓ |
| Ib | Stage Ib, confined pericolic or mesocolic abscess | A confined pericolic or mesocolic abscess lies near the primary inflammatory process, with the stage-Ia wall and pericolic inflammatory changes. The historical Kaiser table describes the local collection as less than 5 cm; record three dimensions and location because current drainage thresholds and other classification schemes use different cutoffs. | Use antibiotics and assess whether image-guided drainage is feasible and necessary. WSES supports an antibiotics-alone trial for selected abscesses under about 4-5 cm and drainage plus antibiotics for larger collections; ASCRS usually recommends drainage for stable patients with an abscess over 3 cm. These are different guideline thresholds, not a reason to silently change the Hinchey stage. Escalate for sepsis, deterioration or failed source control. | An abscess increases nonoperative failure and recurrence risk compared with uncomplicated disease. WSES cites about 20% pooled failure and 0.6% mortality for selected limited-size abscesses treated systemically, while the Kaiser cohort found 22.2% of all abscess patients required urgent resection. Neither figure is an Ib-specific bedside probability. | Tiralongo et al. 2023, PMC10742435, stage Ib row and historical less-than 5 cm descriptor; Sartelli et al. 2020, PMC7206757, small/large abscess recommendations and pooled outcomes; Hall et al. 2020 ASCRS guideline, stable abscess over 3 cm drainage recommendation; Kaiser et al. 2005 abscess results. | ✓ |
| II | Stage II, pelvic or other distant abscess | A contained abscess is distant from the primary diverticular inflammatory process, typically pelvic or interloop and potentially intra-abdominal or retroperitoneal. It remains a localized collection rather than generalized purulent or fecal peritonitis. Location is central; do not create stage II solely because a nearby abscess crossed a treatment-size threshold. | Give antibiotics and plan image-guided drainage when feasible based on collection size, access, physiology and expertise; use close monitoring when drainage is unavailable or unsafe. Surgical reassessment is required for worsening sepsis, persistent collection or failed nonoperative care. After recovery, discuss elective resection individually rather than automatically scheduling colectomy from stage II alone. | Distant abscess denotes more extensive complicated disease. In the historical Kaiser cohort, conservatively treated pelvic abscesses had 41.2% recurrence versus 13% in mild cases, but this retrospective center result is not a current individual forecast. Abscess accessibility, immune status, sepsis and response to therapy materially alter risk. | Tiralongo et al. 2023, PMC10742435, stage II row; Kaiser et al. 2005, PMID 15784040, pelvic-abscess recurrence result; Sartelli et al. 2020 and Hall et al. 2020 for drainage/source-control context; Peery et al. 2021 AGA and 2026 ACG guidance for individualized elective management. | ✓ |
| III | Stage III, generalized purulent peritonitis | Generalized purulent peritonitis is present without gross fecal contamination or an open communication between bowel lumen and peritoneal cavity. CT may show free air, local or generalized free fluid and peritoneal thickening, but imaging alone may not reliably establish purulent contamination; clinical and operative findings must be retained. | Initiate urgent resuscitation, broad antimicrobial therapy and operative source control. In current WSES guidance, primary resection with anastomosis with or without diversion is an option for selected stable patients, while Hartmann resection is favored for critical illness or substantial comorbidity. Laparoscopic lavage is reserved for selected cases and is not first-line treatment. | Generalized peritonitis carries high morbidity and mortality, but modified Hinchey III has no universal per-stage probability applicable across physiologic states and operative strategies. Shock, organ dysfunction, contamination burden, age, comorbidity and time to source control are dominant; do not infer futility or a fixed outcome from the Roman stage. | Hinchey et al. 1978, PMID 735943, purulent-peritonitis description; Tiralongo et al. 2023, PMC10742435, stage III CT row; Sartelli et al. 2020, PMC7206757, diffuse peritonitis, lavage and resection recommendations. | ✓ |
| IV | Stage IV, generalized fecal peritonitis | Generalized fecal peritonitis is present from free perforation with open communication to the bowel lumen and gross fecal contamination. Free air alone is insufficient. When contamination type is not known before source control, report suspected stage III-versus-IV rather than manufacturing stage IV from CT gas volume. | Provide immediate resuscitation, broad antimicrobial therapy and emergency operative source control. Procedure choice is individualized: current WSES guidance favors Hartmann resection in critically ill patients or those with major comorbidity, while primary resection and anastomosis with or without diversion may be considered in stable selected patients. The stage does not mandate one operation for every patient. | This is the most severe contamination category and historically carries very high risk, yet no transportable stage-IV mortality percentage is built into the system. Physiology, organ failure, contamination burden, comorbidity, operative timing and available expertise determine individual risk; stage IV alone is neither a prognosis of certainty nor a treatment-limitation signal. | Hinchey et al. 1978, PMID 735943, fecal-peritonitis and individualized operative discussion; Tiralongo et al. 2023, PMC10742435, stage IV CT row; Sartelli et al. 2020, PMC7206757, operative recommendations for diffuse peritonitis. | ✓ |

### Citações por categoria
- **0**: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/ · Tiralongo et al. 2023, PMC10742435, modified Hinchey table, stage 0; Kaiser et al. 2005, PMID 15784040, recurrence results for mild cases; Peery et al. 2026 ACG guideline recommendations for low-risk uncomplicated diverticulitis.
- **Ia**: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/ · Tiralongo et al. 2023, PMC10742435, modified Hinchey stage Ia table; Sartelli et al. 2020, PMC7206757, pericolic-gas recommendation and WSES scheme; Peery et al. 2026 ACG guideline for selective antibiotic use and high-risk features.
- **Ib**: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/ · Tiralongo et al. 2023, PMC10742435, stage Ib row and historical less-than 5 cm descriptor; Sartelli et al. 2020, PMC7206757, small/large abscess recommendations and pooled outcomes; Hall et al. 2020 ASCRS guideline, stable abscess over 3 cm drainage recommendation; Kaiser et al. 2005 abscess results.
- **II**: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/ · Tiralongo et al. 2023, PMC10742435, stage II row; Kaiser et al. 2005, PMID 15784040, pelvic-abscess recurrence result; Sartelli et al. 2020 and Hall et al. 2020 for drainage/source-control context; Peery et al. 2021 AGA and 2026 ACG guidance for individualized elective management.
- **III**: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/ · Hinchey et al. 1978, PMID 735943, purulent-peritonitis description; Tiralongo et al. 2023, PMC10742435, stage III CT row; Sartelli et al. 2020, PMC7206757, diffuse peritonitis, lavage and resection recommendations.
- **IV**: Kaiser AM, Jiang JK, Lake JP, et al.. The management of complicated diverticulitis and the role of computed tomography (2005) — https://pubmed.ncbi.nlm.nih.gov/15784040/ · Hinchey et al. 1978, PMID 735943, fecal-peritonitis and individualized operative discussion; Tiralongo et al. 2023, PMC10742435, stage IV CT row; Sartelli et al. 2020, PMC7206757, operative recommendations for diffuse peritonitis.

## Histórico de versões

| Data | Evento | Detalhe | Situação |
| --- | --- | --- | --- |
| 2026-08-12 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2026-08-08 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2026-08-03 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2026-08-02 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2026-07-28 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2026-07-27 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2026-07-25 | revised | Monitored source changed (content_hash). Detected automatically; awaiting reviewer confirmation. | needs_review |
| 2005-04-01 | revised | Kaiser and colleagues applied the six-category CT modification with stage 0 and separate Ia/Ib categories in a 511-patient cohort. | confirmed |
| 1978-01-01 | published | Hinchey, Schaal and Richards published the original four-stage operative classification for perforated diverticular disease. | confirmed |


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> Conteúdo de referência reescrito. Confira a publicação primária vigente. Não é dispositivo médico nem substitui o julgamento clínico. O radiologista responsável pelo laudo permanece o autor e o responsável.

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