Gastric band

A gastric band is a surgically placed device, used to assist in weight loss. It is now the most popular form of bariatric surgery, largely replacing gastric bypass procedures 1.

Performed laparoscopically, a silicone band device is placed around the stomach to reduce its volume. The band is adjustable via a port placed in the subcutaneous tissues of the abdomen, which can be filled with a variable volume of liquid to tighten or release the band constriction.

Radiographic features

Imaging can be used to assess for complications such as 1, 2, 3:

Plain film

The band, port and the tubing between them is also visible on plain radiographs.


The port can be accessed using fluoroscopy to puncture the port. The band constriction can then be assessed by barium swallow.

Phi angle is useful to assess position 1:

  • normally between 4-58°
  • must be measured with the gastric band in profile
  • angle measured between a vertical line oriented to the vertebral column and another through the long-axis of the gastric band

See also

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Article information

rID: 21110
Section: Gamuts
Tag: refs, cases
Synonyms or Alternate Spellings:
  • Laparoscopic adjustable gastric banding
  • Gastric lap bands
  • Lap band
  • Adjustable gastric band
  • Laproscopic adjustable gastric band
  • Gastric lap band
  • Gastric bands
  • LAGB
  • Laproscopic adjustable gastric band (LAGB)
  • Laproscopic adjustable gastric bands

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Cases and figures

  • Figure 1: phi angle
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  • Case 1
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  • Case 2
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    Case 3: slipped band with 'O' sign
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  • Case 4: slipped band
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  • Case 5: eroded gastric band
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  • Case 6: SBO due to endoluminal migration of a fractured gastric band
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