"It was reported in 1900 by German surgeon Walther Petersen (1867-1922) 5, on the occurrence of an internal hernia after partial gastrectomy and gastrojejunostomy 3. The internet and the published literature are replete with misspellings of this eponym as 'Peterson'."
"Petersen hernia may occur in both types of anastomosis 1"
"late postoperative obstruction may be due to adhesions, fibrotic stenosis, intussusception or more often, internal hernias 1"