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Difficulty: MediumInterpreting Imaging Results

A 42-year-old female is evaluated in the emergency department for severe, unremitting right upper quadrant abdominal pain that began 12 hours ago. The pain radiates to her right shoulder and is accompanied by nausea and diaphoresis. She has no significant past medical history. Her temperature is 38.4∘C38.4^\circ\text{C} (101.1∘F101.1^\circ\text{F}), pulse is 102/min, and blood pressure is 135/82 mmHg. Abdominal examination demonstrates marked right upper quadrant tenderness with inspiratory arrest upon deep palpation. Laboratory results are notable for a leukocyte count of 13,500/mm313,500/\text{mm}^3 with 82%82\% neutrophils. Total bilirubin, alkaline phosphatase, and aminotransferase levels are within normal limits. A comprehensive right upper quadrant ultrasound is performed and demonstrates a thickened gallbladder wall measuring 6 mm, the presence of pericholecystic fluid, and an immobile 1.4-cm echogenic focus with posterior acoustic shadowing lodged within the gallbladder neck. The extrahepatic biliary tree is well visualized, and the common bile duct diameter is 3 mm.

Which of the following is the most appropriate next step in management based on the interpreted imaging findings?

  1. Admission for early laparoscopic cholecystectomyAnswer
  2. B
    Hepatobiliary iminodiacetic acid (HIDA) scan
  3. C
    Endoscopic retrograde cholangiopancreatography (ERCP)
  4. D
    Discharge home with oral antibiotics and outpatient surgical follow-up
  5. E
    Placement of a percutaneous cholecystostomy tube

Answer

Admission for early laparoscopic cholecystectomy
The correct answer is admission for early laparoscopic cholecystectomy. The patient's clinical presentation (fever, positive Murphy sign, leukocytosis) combined with the definitive ultrasound findings (gallbladder wall thickening greater than 3 mm, pericholecystic fluid, and an obstructing echogenic stone with shadowing) firmly establish the diagnosis of acute cholecystitis. The liver function tests are normal, and the common bile duct is not dilated (normal is generally less than 6 mm), which successfully rules out choledocholithiasis and ascending cholangitis. For a good surgical candidate presenting with acute uncomplicated cholecystitis, the standard of care is hospital admission, initiation of intravenous antibiotics, and early laparoscopic cholecystectomy (typically performed within 48 to 72 hours of symptom onset).

Step-by-Step Solution

1
Analyze the patient's clinical presentation.
The patient has clinical features of acute cholecystitis, including severe right upper quadrant pain, fever, leukocytosis, and a positive Murphy sign.
Identifying the clinical syndrome is essential to appropriately contextualize the subsequent imaging findings.
2
Interpret the right upper quadrant ultrasound findings.
The ultrasound demonstrates a thickened gallbladder wall (6 mm), pericholecystic fluid, and an obstructing stone in the neck, which represent definitive diagnostic criteria for acute cholecystitis.
Accurate interpretation of diagnostic imaging confirms the clinical suspicion and eliminates the need for further testing.
3
Evaluate the common bile duct diameter and liver function tests.
The common bile duct is normal in size (3 mm) and liver function tests are normal, ruling out choledocholithiasis or ascending cholangitis.
This determines if additional biliary interventions (like ERCP) are required prior to surgery.
4
Determine the optimal management strategy based on the interpreted data.
The patient is an otherwise healthy candidate with acute uncomplicated cholecystitis, making admission for early laparoscopic cholecystectomy the standard of care.
Definitive surgical treatment prevents serious complications such as gallbladder gangrene or perforation.

Key Concept

Interpretation of right upper quadrant ultrasound findings to definitively diagnose acute uncomplicated cholecystitis and direct surgical management.
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Topics

Interpreting Imaging Results

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