摘要：1 History A 10-year-old boy has suffered from headache for 1 week accompanied with diplopia. Laboratory test results showed AFP increased significantly. 2 Image Findings Unenhanced MRI revealed a round mass measuring 4.2 cm × 2.0 cm with well-defined margin located in the pineal region. The lesion shows low signal on T1WI, slightly high signal on T2WI, and isosignal on T2-FLAER and DWI. The third ventricle dilation and hydrocephalus can be detected. There is no edema around the mass. On post-contrast images, the mass showed markedly and homogeneous enhancement without necrotic or cystic change.

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