• Woong Ji Kim, So Ri Kim, Yeong Hun Choe, Ka Young Lee, Seoung Ju Park, Heung Bum Lee, Myoung Ja Chung, Gong Yong Jin, and Yong Chul Lee.
• Department of Internal Medicine and Airway Remodeling Laboratory, Chonbuk National University Medical School, Jeonju, Korea.
• J. Korean Med. Sci. 2008 Dec 1; 23 (6): 1121-4.

AbstractClear 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.

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