A 60-year-old diabetic man is admitted to the hospital with a diagnosis of acute cholecystitis. The WBC count is 28,000, and a plain film of the abdomen and CT scan show evidence of intramural gas in the gallbladder. What is the most likely diagnosis?
**Core Concept**
Acute cholecystitis is an inflammatory condition of the gallbladder, often caused by gallstones obstructing the cystic duct. In diabetic patients, the risk of complications such as gangrene and perforation of the gallbladder increases due to impaired immune function and altered blood flow.
**Why the Correct Answer is Right**
The presence of intramural gas in the gallbladder, as evident from the CT scan, is a classic sign of gangrenous cholecystitis or emphysematous cholecystitis. This condition occurs when the gallbladder becomes infected and necrotic, leading to the production of gas. The high white blood cell count (28,000) also supports the diagnosis of an infectious process. In this scenario, the most likely diagnosis is emphysematous cholecystitis, which is a severe and potentially life-threatening complication of acute cholecystitis.
**Why Each Wrong Option is Incorrect**
**Option A:** While acute cholecystitis is a common cause of gallbladder inflammation, the presence of intramural gas and a high WBC count make emphysematous cholecystitis a more likely diagnosis.
**Option B:** Empyema of the gallbladder refers to the accumulation of pus within the gallbladder, but it does not typically present with intramural gas.
**Option C:** Gallbladder cancer is a possibility in older adults, but it would not typically present with acute inflammation and intramural gas.
**Option D:** Choledocholithiasis refers to the presence of gallstones in the common bile duct, which can cause jaundice and pancreatitis but is not directly related to the presence of intramural gas in the gallbladder.
**Clinical Pearl / High-Yield Fact**
In diabetic patients with acute cholecystitis, the risk of emphysematous cholecystitis is significantly higher due to impaired immune function and altered blood flow. A high index of suspicion and prompt imaging studies are essential for diagnosing this potentially life-threatening complication.
**Correct Answer:** C.