title: Acute onset collagenous colitis with unique endoscopic findings.
abstract: We experienced a rare case of 72-year-old woman with acute onset collagenous colitis (CC) induced by lansoprazole. The patient developed acute abdominal pain, watery diarrhea, and melena that are quite rare in usual CC. We could find the characteristic colonoscopic findings such as active long liner ulcers in the patient. We also observed the healing courses of these unique findings. Our case indicates two important points of view. (1) CC sometimes develops with acute onset symptoms which resemble those of ischemic colitis. (2) Colonoscopy would be useful and necessary to distinguish acute onset CC and ischemic colitis.
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Rintaro
authors.identifier: 0000-0002-6759-0135
authors.initials: R
authors.lastname: Moroi
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Katsuya
authors.identifier: 0000-0002-6449-8392
authors.initials: K
authors.lastname: Endo
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Masatake
authors.initials: M
authors.lastname: Kuhroha
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Hisashi
authors.identifier: 0000-0001-6623-2603
authors.initials: H
authors.lastname: Shiga
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Yoichi
authors.identifier: 0000-0002-7042-009X
authors.initials: Y
authors.lastname: Kakuta
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Kinouchi
authors.affiliation: Division of Gastroenterology, Department of Internal Medicine, Tohoku University Graduate School of Medicine, 1-1 Seiryo, Aoba-ku, Sendai 980-8574, Japan.
authors.forename: Tooru
authors.initials: T
authors.lastname: Shimosegawa