Slipped lap band ("O sign")

Case contributed by Dr Jayanth Keshavamurthy


Patient presents to ER for abdominal pain, nausea and vomiting.

Patient Data

Age: 55
Gender: Female

There are classic radiological signs suggestive of gastric band slippage.

Annotated image

Annotated image with phi angle calculated


Coronal volume rendered image showing the slipped lap band.

Case Discussion

It is the radiologist's role to know some of the normal and abnormal findings of gastric band positioning. Radiologists should know what next study to do and why.  

Obesity has become a major medical problem throughout the world. Approximately 400 million people are obese, and about 1.6 billion are overweight. A study performed in the United States in 2005–2006 showed that approximately 1/3 of the population was obese.

Body mass index (BMI) is used to determine obesity by estimating body fat as a calculation of height and weight (kg/m²). A BMI of <18.5 is considered underweight, 18.5–24.9 is normal, 25.0–29.9 is overweight, and ≥30 is obese.

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Case information

rID: 33405
Published: 21st Mar 2015
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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