Interval Appendicectomy after Conservative Management of Complicated Appendicitis: Balancing Recurrence, Neoplasm...

Area of Science:

• Gastroenterology
• Surgical Oncology
• Radiology

Background:

• Non-operative management (NOM) for complicated appendicitis is gaining acceptance.
• The role of interval appendicectomy (IA) after NOM remains controversial.
• Decision-making is shifting towards age-linked neoplasm risk and imaging findings.

Purpose of the Study:

• Synthesize evidence on recurrence after NOM for periappendiceal abscess.
• Evaluate appendiceal tumor prevalence and surveillance strategies.
• Develop a risk-stratified framework for post-NOM management.

Main Methods:

• Review of contemporary randomized trials, prospective cohorts, and meta-analyses.
• Analysis of recurrence rates, tumor prevalence by age, and diagnostic performance of surveillance.
• Synthesis of data to inform a clinical management framework.

Main Results:

• Recurrence after NOM occurs in 12-24% of cases, primarily within six months.
• Appendiceal tumor prevalence increases with age, ~5-10% in 35-39 year olds and 14-20% in those ≥40.
• Interval imaging (CT/MRI) identifies high-risk patients for IA; colonoscopy use is selective.

Conclusions:

• Consider IA for patients ≥40 years, those with persistent symptoms, or concerning imaging.
• Younger patients with complete resolution and no red flags can be observed with follow-up imaging.
• A risk-stratified algorithm is proposed for guiding post-NOM management decisions.