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Radiology of the Third and Fourth Ventricles Part II

Manchester Royal Infirmary

This excerpt was created in the absence of an abstract.

In the preceding sections methods have been described by which the filling of the third ventricle can be brought about with such constancy that failures have a meaning. The importance of a reliable technique is further illustrated by lesions occupying the ventricle behind the interventricular foramina (Monro).

Intraventricular tumours may spring from the ependymal lining (ependymomas), from the neuroglia close to the ventricles (various kinds of gliomas), or from the structures that lie within the ventricular cavities such as the choroid plexus (papillomas), the paraphysis (colloid cysts), or the tela choroidea (meningiomas). Other tumours may originate in structures close by, tumours that come to invaginate themselves into the interior of the ventricles though springing from tissues strictly external. The chief of these are the pinealomas, the gliomas of the quadrigeminal region and of the basal ganglia, and those of congenital pituitary origin (the Rathke pouch or pituitary duct anlage tumours that have already been illustrated). It will be seen that these groups allow of classification into primary intraventricular and primary extraventricular tumours, and one can debate as to whether some tumours, such as the pinealomas, should be included in the one group or the other. Although intellectually interesting, a problem of this kind is not a vital one to the radiologist, but he must study these questions. The more he knows of the pathological anatomy of the various tumours the more easily can he understand the appearances in vivo.

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