1. MR confirms heterogeneously enhancing mass at R foramen of Monro.

2. Findings: Smooth midline thethe lateral ventricles anteriorthe foramen of Monro and appearing isodense with cerebrospinal fluid.

3. Result: (1) Choroid plexus, foramen of Monro, vena thalamostriata, septal vein, mamillary body and aqueduct are important anatomic marks in the ventricle under neuroendoscope.

4. In differentiating the tumors of the trigone and the foramen of Monro, the patient's age was available. CPP was often occurred in children, meningioma in adults and metastasis in old patients.

5. Subependymal nodules can degenerate into giant cell astrocytomas that can result in obstruction at the foramen of Monro with obstructive hydrocephalus.

6. Findings: Head CT shows a heterogeneous soft tissue mass in right lateral ventricle at right foramen of Monro. Heterogeneous contrast enhancement. Nodular ependymal calcifications. Hydrocephalus.

7. The subependymal nodules tend to be located along the ventricular surface of the caudate nucleus, most often on the lamina of the sulcus thalamostriatus immediately posterior to the foramen of Monro.

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8. Most lesions occur in the body or frontal horns of the lateral ventricle or near the foramen of Monro.

9. All giant cell tumors appear to be located at or near the foramen of Monro.

10. Conclusion: (1) The important anatomic road mark in the ventricle was the 'Y'sharp structive at the foramen of Monro under the neuroendoscope.