title: Clear cell "sugar" tumor of the lung: a well-enhanced mass with an early washout pattern on dynamic contrast-enhanced computed tomography.
abstract: Clear cell tumor of the lung is a rare and very unusual benign pulmonary tumor. As clear cell tumor of the lung contains abundant cytoplasmic glycogen, this tumor is called "sugar tumor". We report a case of sugar tumor in a 64-yr-old man presenting as a round pulmonary nodule. On dynamic computed tomography (CT) scans, the solitary pulmonary nodule showed early wash-in enhancement with an early washout pattern like a lung malignancy. The patient underwent wedge resection for the tumor. Pathologic examination, including immunohistochemical studies, revealed that the nodule was a benign clear cell tumor, so-called "sugar tumor". Because only a small number of cases have been reported previously, clinical aspects, radiological characteristics on dynamic contrast-enhanced CT, and differential diagnosis of the tumor are not well established. Herein we present a clear cell tumor of the lung and discuss the clinical, radiological, and pathological features of the tumor.
authors.affiliation: Department of Internal Medicine and Airway Remodeling Laboratory, Chonbuk National University Medical School, Jeonju, Korea.
authors.forename: Woong Ji
authors.initials: WJ
authors.lastname: Kim
authors.forename: So Ri
authors.initials: SR
authors.lastname: Kim
authors.forename: Yeong Hun
authors.initials: YH
authors.lastname: Choe
authors.forename: Ka Young
authors.initials: KY
authors.lastname: Lee
authors.forename: Seoung Ju
authors.initials: SJ
authors.lastname: Park
authors.forename: Heung Bum
authors.initials: HB
authors.lastname: Lee
authors.forename: Myoung Ja
authors.initials: MJ
authors.lastname: Chung
authors.forename: Gong Yong
authors.initials: GY
authors.lastname: Jin
authors.forename: Yong Chul
authors.initials: YC
authors.lastname: Lee
mesh_terms: D000951:Antigens, Neoplasm / Q000378:metabolism; D003937:Diagnosis, Differential; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging / Q000601:surgery; D008175:Lung Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D058950:Melanoma-Specific Antigens; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism; D054973:Perivascular Epithelioid Cell Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology; D003074:Solitary Pulmonary Nodule / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000473:pathology; D014057:Tomography, X-Ray Computed
chemical_list: D000951:Antigens, Neoplasm; D058950:Melanoma-Specific Antigens; D009363:Neoplasm Proteins