Extragonadal Germ Cell Tumors: A Review With Emphasis on Pathologic Features, Clinical Prognostic Variables, and Differential Diagnostic ConsiderationsMcKenney, Jesse K. MD*; Heerema-McKenney, Amy MD* †; Rouse, Robert V. MD‡Advances in Anatomic Pathology: March 2007 - Volume 14 - Issue 2 - p 69-92 doi: 10.1097/PAP.0b013e31803240e6 Review Articles Buy Abstract Author InformationAuthors Article MetricsMetrics Extragonadal germ cell tumors (GCTs) are relatively uncommon, but represent 1% to 5% of all GCTs. Their morphology varies widely and includes mature teratoma, immature teratoma, seminoma, yolk sac tumor, embryonal carcinoma, choriocarcinoma, and mixed GCTs. Noncentral nervous system extragonadal GCTs are found in a variety of anatomic locations, but most commonly affect the mediastinum and sacrococcygeal region. Predicting behavior in these tumors can be confusing because it is based on a combination of varying factors including patient age, histologic subtype, anatomic site, and clinical stage. This review attempts to dissect these issues by separating the discussion into 3 age groups: neonatal (congenital), children (prepubertal), and adult (postpubertal). Within each individual age group, we cover the significance of anatomic site, morphology, and staging parameters. In addition, we discuss the spectrum of associated secondary malignancies and their impact on patient outcome. Finally, we provide a detailed survey of differential diagnostic considerations grouped by anatomic site. *Department of Pathology, University of Arkansas for Medical Sciences †Arkansas Children's Hospital, Little Rock, AR ‡Stanford University School of Medicine, Stanford, CA Reprints: Dr Robert V. Rouse, MD, Department of Pathology L235, Stanford University Medical Center, 300 Pasteur Drive, Stanford, CA 94305 (e-mail: email@example.com). © 2007 Lippincott Williams & Wilkins, Inc.