1. Petersen’s internal hernia complicating a laparoscopic omega loop gastric bypass 
Laurent Genser, M.D., Sergio Carandina, M.D., Antoine Soprani, M.D. 
Surgery for Obesity and Related Diseases 
Volume 11, Issue 5, Pages e33-e34 (September 2015)
DOI: /j.soard
Copyright © 2015 American Society for Bariatric Surgery Terms and Conditions

2. Fig. 1
Transverse CT image shows a cluster of dilated small bowel loops (1) and abnormal course and location of flat intestine in the left mid abdomen (2); (3) rotation of mesenteric vessels (“whirl sign”) with mesenteric fat haziness.
Surgery for Obesity and Related Diseases  , e33-e34DOI: ( /j.soard )
Copyright © 2015 American Society for Bariatric Surgery Terms and Conditions

3. Fig. 2
Petersen’s internal hernia after OLGB. (1) Efferent limb herniated within the Petersen defect; (2) 45° Gastric tube torsion induced by the efferent limb volvulus within the Petersen’s space.
Surgery for Obesity and Related Diseases  , e33-e34DOI: ( /j.soard )
Copyright © 2015 American Society for Bariatric Surgery Terms and Conditions

4. Fig. 3
Petersen’s internal hernia: intraoperative findings before reduction. (1) Transverse colon; (2) Distended small bowel upstream of herniated segment.
Surgery for Obesity and Related Diseases  , e33-e34DOI: ( /j.soard )
Copyright © 2015 American Society for Bariatric Surgery Terms and Conditions