Primary Endodermal Sinus Tumor in the Posterior Cranial Fossa Clinical Analysis of 7 Cases

Objective To clarify the clinical features, therapeutic method and outcomes of the primary endodermal sinus tumors (ESTs) in the posterior cranial fossa. Methods The English literatures on EST in the posterior cranial fossa were retrieved from PubMed and reviewed. And a 4-year-old boy diagnosed with EST in our hospital was reported. The clinical manifestations, therapy, pathologic features, and prognosis of these cases were analyzed. Results Only seven cases of the ESTs in the posterior cranial fossa were enrolled in this review, including six cases searched from the PubMed and one case from our hospital. Six patients were boy and one patient’s gender was not available from the report. Ages ranged from 1 to 5 years (mean 3.14 years). The mean tumor size in our cohort was 4.4 cm. Six cases came from East Asia. Schiller-Duval bodies were found in all seven neoplasms. All tumors were positive for alpha-fetoprotein. The alpha-fetoprotein level in serum was increased to a very high level before therapy and depressed quickly after the effective chemotherapy. The mean follow-up time was 24.4 months (range 5-52 months). Six tumors were totally removed, and four of them recurred. Three cases died including one whose tumor was partially removed. Conclusions The serum alpha-fetoprotein level is well correlated with the severity of the tumor. A combination of operation and chemotherapy might be the effective management for EST in the posterior cranial fossa. The prognosis of extragonadal intracranial EST is poor.