Colonic Pseudo-obstruction With Transition Zone: A Peculiar Eastern Severe Dysmotility

Area of Science:

• Gastroenterology
• Colorectal Surgery
• Gastrointestinal Pathology

Background:

• Chronic intestinal pseudo-obstruction (CIPO) is a debilitating condition.
• Previous studies in Korea have identified a transition zone (TZ) in the colon of CIPO patients.
• The pathological characteristics and long-term outcomes of Korean CIPO patients with TZ require further evaluation.

Purpose of the Study:

• To evaluate the pathological characteristics of the transition zone (TZ) in Korean patients with colonic pseudo-obstruction (CPO).
• To determine the association between pathological findings in the TZ and long-term outcomes after colectomy in CPO patients.

Main Methods:

• Retrospective analysis of 39 CPO patients who underwent colectomy.
• Definition of TZ as a colonic segment connecting dilated and non-dilated areas.
• Detailed pathological analysis of resected colonic tissue, including ganglion cell density.

Main Results:

• A transition zone (TZ) was identified in 94.9% of Korean CPO patients.
• Significantly decreased ganglion cell density was observed in the TZ compared to other segments (P < 0.001).
• Additional pathological findings (e.g., eosinophilic ganglionitis, ulcers with CMV) were noted in 6 patients.
• Symptom recurrence after surgery was predicted by pathological features beyond hypoganglionosis (P = 0.046).

Conclusions:

• Hypoganglionosis is a common finding in the TZ of Korean CPO patients.
• The presence of additional pathological features alongside TZ-associated hypoganglionosis is linked to adverse post-operative outcomes.