title: Flat-type primary malignant melanoma of the esophagus.
authors.affiliation: Department of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Hiroya
authors.initials: H
authors.lastname: Ueyama
authors.affiliation: Department of Human Pathology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yao
authors.affiliation: Department of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Kenshi
authors.initials: K
authors.lastname: Matsumoto
authors.affiliation: Department of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Yuta
authors.initials: Y
authors.lastname: Nakagawa
authors.affiliation: Department of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Takeda
authors.affiliation: Department of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Kohei
authors.initials: K
authors.lastname: Matsumoto
authors.affiliation: Department of Gastroenterology, Juntendo University, Shizuoka Hospital, Shizuoka, Japan.
authors.forename: Akihito
authors.initials: A
authors.lastname: Nagahara
authors.affiliation: Department of Gastroenterology, Juntendo University, School of Medicine, Tokyo, Japan.
authors.forename: Sumio
authors.initials: S
authors.lastname: Watanabe