Hinchey Classification of Diverticulitis

Classification Systems Overview

The Hinchey classification remains the most widely used system for categorizing acute diverticulitis severity, with the Modified Hinchey Classification incorporating CT findings to guide treatment decisions ranging from conservative management to emergent surgery 1, 2
Multiple classification systems exist for acute left-sided colonic diverticulitis, though none has been conclusively proven superior in predicting patient outcomes 1, 2

The original Hinchey classification categorizes severity into four stages based on operative findings: Hinchey I (Pericolic abscess), Hinchey II (Pelvic, intra-abdominal, or retroperitoneal abscess), Hinchey III (Generalized purulent peritonitis), and Hinchey IV (Fecal peritonitis) 1
The Modified Hinchey Classification incorporates CT findings for more precise preoperative diagnosis, including Stage 1a (Confined pericolic inflammation) and Stage 1b (Confined pericolic abscess) 1
The Mora Lopez (Neff Modification) system provides more granular staging for early complicated disease, including Uncomplicated (Diverticula, wall thickening, increased pericolic fat density), Locally complicated, and Complicated with pelvic abscess 1, 2
The World Society of Emergency Surgery proposed a simplified two-tier system, including Uncomplicated (Infection confined to colon without peritoneal extension) and Complicated (4 stages based on infectious process extension) 1, 2

The American College of Surgeons recommends CT scan with contrast for accurate classification and treatment selection 1, 2
The World Society of Emergency Surgery recommends stage-specific management, including observation with pain management for Uncomplicated Diverticulitis (Hinchey 0, Stage 1a) 2
The European Society of Coloproctology recommends percutaneous drainage for Larger Abscess (Hinchey 2, ≥ 4 cm) 1
The American College of Surgeons recommends surgical intervention for Generalized Purulent Peritonitis (Hinchey 3) and Fecal Peritonitis (Hinchey 4) 1, 2

The Hinchey classification is the most widely used system for categorizing the severity of acute colonic diverticulitis, guiding treatment decisions based on the extent of infection and inflammation beyond the colon 3, 4
The original Hinchey classification categorizes diverticulitis into four stages: Stage 1 (Pericolic abscess), Stage 2 (Pelvic, intra-abdominal, or retroperitoneal abscess), Stage 3 (Generalized purulent peritonitis), and Stage 4 (Fecal peritonitis) 3, 4
The Modified Hinchey Classification incorporates CT findings for more precise diagnosis, with stages ranging from Stage 0 (Mild clinical diverticulitis) to Stage 4 (Fecal peritonitis at presentation) 3

For complicated diverticulitis with small abscess (Hinchey 1b), non-operative management with bowel rest and antibiotics is recommended for small abscesses (<4 cm) 3
For complicated diverticulitis with larger abscess (Hinchey 2), percutaneous drainage is recommended for abscesses >4 cm 3
The World Society of Emergency Surgery proposed a CT-guided classification system that divides diverticulitis into uncomplicated and complicated forms, with stages ranging from Stage 1A (Pericolic air bubbles or small amount of pericolic fluid without abscess) to Stage 4 (Diffuse fluid with distant free gas) 3

CT imaging is essential for accurate classification and management planning 3
Relying solely on clinical examination for diagnosis is not recommended due to poor accuracy 3
Failure to obtain CT imaging may lead to misclassification and inappropriate management 3