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Detection of Unknown Primary Tumor in a Patient with Cerebellar Metastasis Using FDG PET-CT: Case Report Tomoya ISHIGURO 1 , Yoshihiko FU 1 , Tsuyosi SADATOU 1 , Nobuyuki SHIMOKAWA 1 , Kazunori SHIBAMOTO 1 1Department of Neurosurgery,Tsukazaki Hospital Keyword: PET-CT , FDG , Brain metastasis , Unknown primary tumor , Lung cancer pp.1027-1032
Published Date 2006/10/1
DOI https://doi.org/10.11477/mf.1436100292
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 Identification of unknown primary tumors in patients with brain metastasis is a continued diagnostic challenge. Several clinical reports have suggested that 18F-flouorodeoxyglucose positron emission tomography (FDG PET) is useful for detecting them. PET has incomparable abilities to determine the metabolic activity of tissues. But it needs the assistance of higher-resolution,anatomic information. CT is the easiest and highest-resolution tomographic modality to be integrated into PET imaging. Because of this,the market for PET devices has shifted so dramatically toward PET-CT.

 We report a case to show that FDG PET-CT was able to detect an unknown primary tumor. A 75-year-old female underwent resection of a left cerebellar tumor. The histological diagnosis was adenocarcinoma metastasis. Conventional systemic evaluation (chest radiography,chest and abdomen CT,abdominal sonography,and so on) did not show any pathologic image. FDG PET-CT was then carried out. A hypermetabolic focus was revealed in the left hilum.

 In conclusion,from now on,FDG PET-CT will be considered as the first diagnostic process for patients presenting brain metastasis with an unknown primary tumor.


Copyright © 2006, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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