Question:
A patient develops a common bile duct (CBD) stone one year after undergoing cholecystectomy. What is the most likely diagnosis?
A patient develops a common bile duct (CBD) stone one year after undergoing cholecystectomy. What is the most likely diagnosis?
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Timeframe rule for CBD Stones Post-Cholecystectomy:
- $<$ 2 years = Retained (Secondary) stone (usually cholesterol).
- $>$ 2 years = Recurrent (Primary) stone (usually brown pigment).
- $<$ 2 years = Retained (Secondary) stone (usually cholesterol).
- $>$ 2 years = Recurrent (Primary) stone (usually brown pigment).
Updated On: Sep 3, 2026
- Retained stone
- Recurrent stone
- Primary stone
- Black stone
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The Correct Option is A
Solution and Explanation
Concept:
The clinical definition differentiating a "retained" from a "recurrent" common bile duct (CBD) stone relies strictly on the chronological timeframe following a cholecystectomy.
Explanation:
• A Retained CBD stone (Option A) is defined as a stone that migrated from the gallbladder into the bile duct prior to or during the cholecystectomy but was missed or left behind during the operation. Clinically, these stones typically become symptomatic and are discovered within the first 2 years (24 months) following the surgery. They share the same biochemical composition as gallbladder stones (usually cholesterol or mixed).
• A Recurrent CBD stone (Option B), also known as a Primary stone (Option C), is a stone that forms de novo within the bile duct itself due to bile stasis, stricture, or chronic bacterial infection. These typically present more than 2 years after the cholecystectomy.
• Primary/recurrent stones are typically brown pigment stones composed of calcium bilirubinate.
• Since this patient presented exactly one year (12 months) post-cholecystectomy, it falls well within the classic 2-year window indicative of a stone that was missed at the time of the original surgery.
Final Answer:
A CBD stone discovered within 2 years of a cholecystectomy is classified as a retained stone, having likely originated from the gallbladder.
The clinical definition differentiating a "retained" from a "recurrent" common bile duct (CBD) stone relies strictly on the chronological timeframe following a cholecystectomy.
Explanation:
• A Retained CBD stone (Option A) is defined as a stone that migrated from the gallbladder into the bile duct prior to or during the cholecystectomy but was missed or left behind during the operation. Clinically, these stones typically become symptomatic and are discovered within the first 2 years (24 months) following the surgery. They share the same biochemical composition as gallbladder stones (usually cholesterol or mixed).
• A Recurrent CBD stone (Option B), also known as a Primary stone (Option C), is a stone that forms de novo within the bile duct itself due to bile stasis, stricture, or chronic bacterial infection. These typically present more than 2 years after the cholecystectomy.
• Primary/recurrent stones are typically brown pigment stones composed of calcium bilirubinate.
• Since this patient presented exactly one year (12 months) post-cholecystectomy, it falls well within the classic 2-year window indicative of a stone that was missed at the time of the original surgery.
Final Answer:
A CBD stone discovered within 2 years of a cholecystectomy is classified as a retained stone, having likely originated from the gallbladder.
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