Question

A 56-year-old man presents with left lower quadrant abdominal pain, fever, and leukocytosis. CT abdomen reveals acute sigmoid diverticulitis with a 3 cm pericolic abscess. What is the most appropriate first step in management?

• A. Intravenous antibiotics
• B. CT-guided drainage
• C. Analgesics
• D. Elective colectomy

Hint:

Diverticular Abscess Management Rule:
Abscess size $< 3-4$ cm: Treat conservatively with IV Antibiotics alone.
Abscess size $> 4$ cm: Treat aggressively with IV Antibiotics AND CT-guided percutaneous drainage.
Emergency Surgery is reserved only for generalized peritonitis or failure of drainage.

Answer 1

The Correct Option is A

Concept:
A middle-aged male patient presents with acute, localized peritoneal signs, fever, and an elevated white blood cell count. A CT scan of the abdomen explicitly diagnoses acute complicated diverticulitis, specifically noting the presence of a "small" 3 cm pericolic abscess.
The clinical decision hinges precisely on the size of the abscess, as strict surgical and gastroenterology guidelines dictate different initial management pathways based on abscess diameter.
Explanation:
• Acute diverticulitis involves the microperforation and subsequent inflammation of a colonic diverticulum. It is categorized as "complicated" when it results in the formation of an abscess, fistula, bowel obstruction, or free frank macroperforation.

• The management of diverticular abscesses is primarily dictated by their size, typically measured accurately on an initial abdominal CT scan.

• Small pericolic abscesses, generally strictly defined by surgical literature as measuring less than 3 to 4 cm in diameter, very frequently do not require any immediate invasive procedural interventions.

• The absolute standard, guideline-directed first step in managing these specific small abscesses is admitting the patient for bowel rest and promptly initiating a robust course of broad-spectrum Intravenous (IV) antibiotics (Option A).

• These small, contained inflammatory collections have a high likelihood of responding excellently to medical management alone, resolving completely without exposing the patient to procedural risks.

• In sharp contrast, significantly larger abscesses (definitively $> 4$ cm) are highly unlikely to be sterilized by antibiotics alone and generally mandate immediate CT-guided percutaneous drainage (Option B) to achieve adequate source control alongside the antibiotics.

• Utilizing Analgesics alone (Option C) is entirely insufficient and ignores the active, dangerous intra-abdominal infection.

• Elective colectomy (Option D) is absolutely never the first step in an acute, inflamed setting; it is generally a delayed, planned procedure considered weeks to months later to prevent recurrences in high-risk patients.
Final Answer:
For a small pericolic diverticular abscess measuring $\le 3$ cm, the most appropriate and guideline-recommended first step in management is the administration of broad-spectrum IV antibiotics.