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Difficulty: EasyGastrointestinal and Abdominal Surgery

Match each classic imaging finding described below with its most likely gastrointestinal or surgical diagnosis.

  • Abdominal radiograph showing multiple centrally located dilated bowel loops with a 'step-ladder' appearance and air-fluid levels.Small bowel obstruction
  • Abdominal radiograph showing a massively dilated large bowel loop forming a 'coffee bean' shape pointing toward the right upper quadrant.Sigmoid volvulus
  • Barium swallow study demonstrating severe dilation of the proximal esophagus with smooth, symmetric tapering at the lower esophageal sphincter.Achalasia
  • Upright chest radiograph demonstrating a radiolucent crescent of free air between the right hemidiaphragm and the liver.Perforated hollow viscus

Answer

The correct matches are: 1) 'step-ladder' appearance with Small bowel obstruction, 2) 'coffee bean' sign with Sigmoid volvulus, 3) 'bird's beak' tapering with Achalasia, and 4) pneumoperitoneum with Perforated hollow viscus.
Each imaging finding perfectly correlates with the underlying pathophysiology of its respective surgical condition. Step-ladder air-fluid levels indicate fluid pooling in an obstructed small intestine. The coffee bean shape represents a twisted, distended sigmoid colon. The bird's beak narrowing reflects the hypertonic lower esophageal sphincter in achalasia. Subdiaphragmatic air signifies pneumoperitoneum from a transmural perforation.

Step-by-Step Solution

1
Identify the etiology of the 'step-ladder' appearance.
Matches with Small bowel obstruction.
Mechanical blockage of the small intestine leads to dilation of proximal loops, creating stacked air-fluid levels as fluid and gas accumulate.
2
Identify the etiology of the 'coffee bean' sign.
Matches with Sigmoid volvulus.
Twisting of the redundant sigmoid colon creates a closed-loop obstruction that inflates like an inverted U or a coffee bean shape.
3
Identify the etiology of the 'bird's beak' sign.
Matches with Achalasia.
Failure of the lower esophageal sphincter to relax produces a smooth, symmetric tapering of the distal esophagus on contrast imaging.
4
Identify the etiology of free air under the right hemidiaphragm.
Matches with Perforated hollow viscus.
A full-thickness bowel or stomach wall injury releases intraluminal gas into the peritoneal cavity, which rises under the diaphragm when upright.

Key Concept

Classic radiographic signs in gastrointestinal and abdominal surgery
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Topics

Gastrointestinal and Abdominal Surgery

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