Abstract: A teratoma is a nonseminomatous germ cell tumor composed of well-differentiated derivations from at least 2 of the 3 germ layers. Mature cystic teratomas are known to have low metabolic activity and do not exhibit increased FDG uptake on PET. We report a case of mature cystic teratoma of the retroperitoneum showing increased FDG uptake in the solid portion. Pathologically, the solid portion was composed of abundant central nervous tissue. Increased FDG uptake in a teratoma may be not only due to an immature or malignant component but also to the presence of central nervous tissue.
From the Department of Radiology and Research Institute of Radiological Science, Severance Children’s Hospital, Yonsei University, College of Medicine, Seoul, Korea.
Received for publication October 30, 2012; revision accepted April 5, 2013.
Conflicts of interest and sources of funding: none declared.
Reprints: Mi-Jung Lee, MD, PhD, Department of Radiology and Research Institute of Radiological Science, Severance Children’s Hospital, Yonsei University, College of Medicine, 50 Yonsei-ro, Seodaemun-gu, 120-752 Seoul, Korea. E-mail: firstname.lastname@example.org.