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Difficulty: MediumInterpreting Imaging Results

Match the described hallmark gastrointestinal radiographic findings to their most likely diagnostic conditions.

  • Pneumatosis intestinalis accompanied by portal venous gas on abdominal computed tomographyAdvanced mesenteric ischemia with bowel infarction
  • Rigler sign (double-wall sign) clearly demonstrating both mucosal and serosal surfaces on a supine radiographPneumoperitoneum secondary to a perforated hollow viscus
  • Focal, irregular, circumferential narrowing of the colonic lumen with overhanging margins on contrast enemaColorectal adenocarcinoma
  • Smooth, symmetric, tapering narrowing of the distal esophagus on a barium swallow studyAchalasia

Answer

Pneumatosis with portal venous gas matches advanced mesenteric ischemia. The Rigler sign matches pneumoperitoneum. The apple-core lesion matches colorectal adenocarcinoma. The bird's beak sign matches achalasia.
Each imaging sign is a hallmark presentation of a specific gastrointestinal pathology. Proper recognition ensures appropriate triage, distinguishing patients who require emergent surgery (e.g., mesenteric ischemia or perforated viscus) from those needing endoscopic evaluation or motility management (e.g., colorectal adenocarcinoma or achalasia).

Step-by-Step Solution

1
Analyze the first imaging finding (pneumatosis and portal venous gas).
Identified as a sign of bowel wall necrosis and gas embolization.
To correlate severe ischemia with transmural infarction, pointing to mesenteric ischemia.
2
Evaluate the Rigler sign.
Recognized as the double-wall sign on a supine abdominal film.
This phenomenon is only possible if free air surrounds the outside of the bowel wall, confirming pneumoperitoneum.
3
Assess the circumferential narrowing with overhanging margins.
Identified as the 'apple-core' sign.
This fluoroscopic pattern is virtually diagnostic of an annular, obstructing malignancy like colorectal adenocarcinoma.
4
Interpret the distal esophageal tapering.
Recognized as the classic 'bird's beak' sign.
This correlates to hypertonicity and failure of relaxation at the lower esophageal sphincter, defining achalasia.

Key Concept

Recognizing pathognomonic imaging signs in gastrointestinal disorders is critical for establishing an immediate and accurate diagnosis to guide life-saving clinical management.
Estimated Time:1m 30s
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Interpreting Imaging Results

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