Stage Ia — Confined Pericolic Phlegmon or Microabscess
A tiny abscess stays walled off right next to the inflamed colon.
- Pericolic: Location (Adjacent to colon wall)
- <2 cm: Size (Typically small)
- Confined: Containment (No free spread)
- Antibiotics: First-line (Outpatient possible)
What defines Stage Ia
Localized inflammation with a small confined pericolic abscess.
Typical presentation
Mild left lower quadrant pain, low-grade fever, minimal peritoneal signs.
Stage Ib/II — Larger Walled-Off Pelvic or Distant Abscess
A bigger abscess forms further away but stays contained by adhesions.
- Pelvic/distant: Location (Beyond pericolic space)
- ≥4 cm: Size (Often drainable)
- Walled off: Containment (Adhesion-bound)
- Drain + antibiotics: First-line (CT-guided)
What defines Stage Ib/II
A larger collection separate from the colon, still contained.
Management shift
Percutaneous drainage often avoids emergency surgery.
Stage III — Generalized Purulent Peritonitis
The abscess ruptures and pus spreads through the abdominal cavity.
- Diffuse: Spread (Free purulent fluid)
- Open: Perforation (No fecal contamination)
- Generalized: Peritonitis (Rebound tenderness)
- Surgery: First-line (Lavage or resection)
What defines Stage III
Pus, not stool, spreads freely through the peritoneal cavity.
Surgical options
Laparoscopic lavage or resection depending on stability.
Stage IV — Generalized Feculent Peritonitis
Free perforation spills stool into the abdomen, the most severe stage.
- Diffuse: Spread (Fecal contamination)
- Free: Perforation (Direct colon opening)
- Highest: Mortality (Among the four stages)
- Emergency surgery: First-line (Hartmann procedure)
What defines Stage IV
Free fecal spillage causes the most severe contamination.
Emergency management
Resection with diversion; primary anastomosis is high risk.
Stage IV carries the highest mortality of all Hinchey stages.
Treatment Tactic Escalation Across Hinchey Stages
Management escalates from antibiotics alone to emergency resection.
- Antibiotics: Stage I (± outpatient care)
- Drain + antibiotics: Stage II (CT-guided percutaneous)
- Lavage/resection: Stage III (Laparoscopic or open)
- Hartmann: Stage IV (Resection + diversion)
Choosing the right tactic
Stage, stability, and drainable collections guide the decision.
Escalation principle
Less invasive options are tried first when safely possible.