A 55-year-old woman with acute cholecystitis (confirmed by ultrasound: wall thickening, pericholecystic fluid, positive sonographic Murphy's sign) undergoes conservative management with IV fluids and antibiotics. After 48 hours, her fever persists, WBC remains elevated at 16,000/μL, and repeat ultrasound shows a 4 cm fluid collection adjacent to the gallbladder. A 60-year-old man with similar acute cholecystitis presentation is managed identically; at 48 hours, his fever has resolved, WBC is 10,500/μL, and repeat ultrasound shows resolving wall edema with no fluid collection. Which imaging/clinical finding BEST distinguishes acute suppurative cholecystitis from uncomplicated acute cholecystitis?

Explanation

## Acute Suppurative Cholecystitis vs. Uncomplicated Acute Cholecystitis ### Definition and Pathophysiology **Key Point:** Acute suppurative cholecystitis (also called suppurative or gangrenous cholecystitis) is a complication of acute cholecystitis characterized by pus formation within the gallbladder lumen or in the pericholecystic space due to secondary bacterial infection and necrosis. Uncomplicated acute cholecystitis is acute inflammation without suppuration or necrosis. ### Comparison Table | Feature | Uncomplicated Acute Cholecystitis | Acute Suppurative Cholecystitis | |---------|----------------------------------|--------------------------------| | **Fever** | Present, resolves in 48–72 hrs | Persistent despite antibiotics | | **WBC count** | Elevated, normalizes with treatment | Markedly elevated, persists | | **Pericholecystic fluid** | Absent or minimal serous fluid | Present (pus), >2–3 cm collection | | **Gallbladder wall** | Edema, thickening | Thickening + necrosis/perforation risk | | **Response to medical therapy** | Good (70–80% resolve) | Poor; requires urgent intervention | | **Imaging findings** | Wall thickening, mild edema | Pericholecystic abscess, emphysematous changes | | **Clinical course** | Improves over 48–72 hrs | Deteriorates or plateaus | ### High-Yield Facts **High-Yield:** Suppurative cholecystitis is a surgical emergency. The combination of **persistent fever + leukocytosis + pericholecystic fluid collection** despite appropriate medical management indicates suppuration and requires urgent cholecystectomy or percutaneous drainage. Delayed intervention increases risk of perforation and sepsis. **High-Yield:** Pericholecystic fluid in the setting of **clinical deterioration or non-response to antibiotics** is the imaging hallmark of suppurative cholecystitis. In uncomplicated cholecystitis, minimal serous fluid may be present but resolves with medical therapy. ### Clinical Pearl **Clinical Pearl:** The **48-hour rule** is a useful clinical checkpoint: uncomplicated acute cholecystitis typically shows clinical improvement (fever resolving, WBC normalizing) by 48–72 hours of medical management. Persistent or worsening fever and leukocytosis at this point should raise suspicion for suppuration and warrant imaging reassessment. ### Why Option 1 is Correct Option 1 identifies the constellation of findings that distinguish suppurative from uncomplicated cholecystitis: a **pericholecystic fluid collection (abscess) in the context of persistent fever and elevated WBC despite appropriate medical management**. This combination indicates secondary bacterial infection with pus formation and mandates urgent surgical or percutaneous intervention. [cite:Sabiston Textbook of Surgery 21e Ch 54]