Here, the authors present 2 cases of nongerminomatous germ cell tumor (NGGCT): a neonate with a mixed malignant germ cell tumor, 5% yolk sac tumor (YST) and 95% immature teratoma components, originating from the right mesial temporal lobe; and a 2-month-old infant with a pure YST originating from the left middle cranial fossa. These tumors with yolk sac components, which are thought to have a poor prognosis, were successfully treated with complete tumor resection alone and subtotal tumor resection with chemotherapy, respectively. Event-free survival exceeds 5 years for each patient even though neither received radiotherapy. The authors highlight the role of radical surgery and the successful treatment of neonatal YST with aggressive resection (and chemotherapy in 1 case) while avoiding radiation therapy. They also report the very rare non-midline location of these neonatal NGGCTs and emphasize the importance of considering YSTs and mixed NGGCTs with YST components in the differential diagnosis of non-midline hemispheric or skull base tumors in newborns.

Successful treatment of non-midline primary malignant germ cell tumors with yolk sac components in neonates: report of 2 cases.

The authors describe a series of 15 intracranial germ cell tumors (IGCTs) excluding mature teratomas; 3 cases in children younger than 3 years of age who were treated at 3 different international institutions over the course of 20 years, and 12 from a PubMed search. These tumors, with possible in utero origins, often occur in atypical locations. The clinical behavior differed significantly from these tumors' counterparts in older children. In this young age group germinoma is highly aggressive, whereas nongerminomatous germ cell tumors may be cured without radiotherapy. Ongoing genomic studies reveal insights to attain an understanding of the biology of these tumors. New treatment strategies are needed to improve outcomes for IGCTs in this age group, particularly for germinomas.

Atypical location and clinical behavior of a subset of intracranial germ cell tumors in children younger than 3 years of age

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Atypical location and clinical behavior of a subset of intracranial germ cell tumors in children younger than 3 years of age