中文摘要：

目的：提高对PET-CT显像的良性病变的认识和诊断水平。方法：本文报道了18F-FDGPET显像的结节病误诊为肺癌1例，并对相关文献进行复习。结果：1例18F-FDGPET显像病例，最终通过活检病理诊断为结节病。结论：18F-FDGPET显像的结节病的诊断有赖于病理诊断，仅凭临床表现和影像学结果极易误诊为肿瘤，需提高对本病的认识，避免误诊。

英文摘要：

Objective：To improve the understanding and diagnosis of benign diseases which can be displayed by PET - CT. Methods：This study presents one case report that the sareoidosis displayed by 18F - FDG PET was misdi- agnosed as lung cancer, and the related literature review. Results：One case that was displayed by 18 F - FDG PET was finally pathologic diagnosed with sarcoidosis by biopsy. Conclusion：The diagnosis of sarcoidosis depends on patholog- ic diagnosis. Sarcoidosis is easily misdiagnosed as tumor only by clinical manifestations and imaging results. There- fore,it is necessary to improve the understanding of this disease to avoid the misdiagnosis.