title: Esophageal squamous cell carcinoma recurring as a solitary renal mass.
abstract: Herein, a case of solitary, unilateral renal metastasis in a patient with curatively resected thoracic esophageal carcinoma, who achieved a pathological complete remission after neoadjuvant concurrent chemoradiotherapy, is reported. The kidney is the 4(th) or 5(th) most common visceral metastasis site of a primary esophageal carcinoma. More than 50% of renal metastases typically show bilateral involvement. Solitary, unilateral renal metastasis is extremely rare. Renal metastases from a primary esophageal carcinoma are usually latent and its diagnosis is very unusual in a live patient. The solitary renal metastasis in this case was not accompanied by metastases to other sites. The value of a nephrectomy in solitary renal metastasis of esophageal cancer is not known due to the rarity of such cases. A nephrectomy could be justified in limited situations, such as with uncertainty of histological diagnosis, severe life-threatening hematuria, which cannot be controlled by embolization, or solitary renal metastasis with a long disease-free interval.
authors.affiliation: Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Do Hyoung
authors.initials: DH
authors.lastname: Lim
authors.forename: Young-Hyuck
authors.initials: YH
authors.lastname: Im
authors.forename: Sang Hoon
authors.initials: SH
authors.lastname: Ji
authors.forename: Byeong-Bae
authors.initials: BB
authors.lastname: Park
authors.forename: Mi Jung
authors.initials: MJ
authors.lastname: Oh
authors.forename: Jeeyun
authors.initials: J
authors.lastname: Lee
authors.forename: Keun Woo
authors.initials: KW
authors.lastname: Park
authors.forename: Se-Hoon
authors.initials: SH
authors.lastname: Lee
authors.forename: Joon-Oh
authors.initials: JO
authors.lastname: Park
authors.forename: Kihyun
authors.initials: K
authors.lastname: Kim
authors.forename: Won Seog
authors.initials: WS
authors.lastname: Kim
authors.forename: Chul Won
authors.initials: CW
authors.lastname: Jung
authors.forename: Young Suk
authors.initials: YS
authors.lastname: Park
authors.forename: Won Ki
authors.initials: WK
authors.lastname: Kang
authors.forename: Mark H
authors.initials: MH
authors.lastname: Lee
authors.forename: Kwanmien
authors.initials: K
authors.lastname: Kim
authors.forename: Young Mog
authors.initials: YM
authors.lastname: Shim
authors.forename: Keunchil
authors.initials: K
authors.lastname: Park