Chandu, a 45 yrs male shows calcification on the Rt side of his abdomen in an AP view. In lateral view the calcification is seen to overlie the spine. Most likely diagnosis is:
**Core Concept**
The question requires the identification of a condition where calcification in the abdomen is visible on an X-ray, with specific characteristics that help narrow down the diagnosis. This involves understanding the anatomical relationships and radiographic appearances of various abdominal structures.
**Why the Correct Answer is Right**
The description provided points towards a calcified gallstone that has moved to the right lower quadrant of the abdomen, likely due to a perforation of the gallbladder or a fistula with the adjacent bowel. The fact that the calcification is seen to overlie the spine in the lateral view suggests that it is located in the right lower quadrant, which is typical for a gallstone that has migrated from the gallbladder to the appendix or the cecum. This condition is known as a **Rigler's sign**, where a calcified gallstone is seen to overlap the spine due to its location in the right lower quadrant.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not provide a specific diagnosis that matches the description given in the question. The description of calcification overlying the spine in the lateral view is a key feature that helps narrow down the diagnosis.
**Option B:** This option is incorrect because it does not accurately describe the radiographic appearance of calcification in the abdomen. While calcification can be seen in various abdominal structures, the specific description provided in the question points towards a gallstone.
**Option C:** This option is incorrect because it does not match the description given in the question. The description of calcification overlying the spine in the lateral view is a key feature that helps narrow down the diagnosis, and this option does not provide a specific diagnosis that matches this description.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Rigler's sign is a classic radiographic finding that suggests a gallstone has migrated from the gallbladder to the appendix or the cecum, typically due to a perforation of the gallbladder or a fistula with the adjacent bowel.
**Correct Answer: C. Cholecystoappendiceal fistula with gallstone ileus.**