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J Korean Neurosurg Soc. 1976 Jun;5(1):45-49. Korean. Original Article.
Kim HJ , Lee KC , Lee HJ .
Department of Neurosurgery, Yonsei University College of Medicine, Seoul, Korea.
Abstract

It is well known that many investigators have devised the methods for the localization of foramen of Monro, considering it as an essential one in stereotactic brain surgery. They have made use of calcified pineal gland, pneumoencephalogram or calculation of the coordinates of the foramen of Monro by bone structures etc. But the complications brought about by the above mentioned methods and nonvisualization of the pineal gland have made them in complex to make exact localization of foramen of Monro. The author devised a new, simple method for the localization of foramen of Monro, using 20 cases of lateral view of pneumoencephalogram whose diagnoses were confirmed as idiopathic epilepsy. The results obtained are as follow : 1. The anterior margin of foramen of Monro is located on the line interconnecting the central point of sella turcica and inner table of the cranial vault with the angle of 86.2?.3? provided that the base line is supposed as the line interconnecting the central point of sella turcica and the internal occipital protuberance. 2. The length from the central point of sella turcica to the anterior margin of foramen of Monro is measured to be 3.5 not equal 0.2cm. 3. Approximately 0.3 is calculated from the ratio between the segment interconnecting the central point of sella turcica and the anterior margin of foramen of Monro, and the segment interconnecting the central point of sella turcica and inner table of skull through anterior margin of foramen of Monro.

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