Toshio Okudera

The choroidal and nodular branches of the posterior inferior cerebellar artery. Their value in the diagnosis of medulloblastomas.

Abstract Radiographs of 10 autopsy specimens demonstrated anatomy of choroidal and nodular branches of the posterior inferior cerebellar artery. The nodular branches with posterior displacement, as seen in 5 of 12 medulloblastomas, were of diagnostic value in tumors originating in or invading the inferior vermis. Choroidal branches were enlarged in 3 medulloblastomas and 1 choroid plexus papilloma, suggesting considerable significance in diagnosis of fourth ventricle tumors. These arterial branches were not definitely visualized in 60 normal vertebral angiograms nor in another 60 cases with other intracranial expanding lesions.

Angiographic Diagnosis of Fourth Ventricle Tumors

Twelve primary fourth ventricle tumors and 22 medulloblastomas occupying mainly the fourth ventricle were analyzed, with emphasis on the differential diagnosis, vascularity, and some unusual findings. Though both types of tumor often have identical manifestations, the correct diagnosis can be made in most cases by careful evaluation of the posterior inferior cerebellar artery, particularly the choroidal and nodular branches. Unusual findings in primary fourth ventricle tumors mimicking tumors of the pons and medulla oblongata are described, and possible explanations for these findings are discussed. The results of this study underscore the importance of angiotomography in the diagnosis of tumors of the fourth ventricle.

The choroid plexus and the choroid vein of the lateral ventricle. Their angiographic appearance and clinical significance.

Abstract On the basis of 20 halves of autopsied brains and 100 normal vertebral angiograms, the angiographic anatomy of the choroid plexus and superior choroid vein is described. Visualization of the superior choroid vein was good in 97% of cases and of the choroid plexus in 84%. Careful assessment of 30 supratentorial lesions showed superior displacement in thalamic and pineal tumors, while considerable depression was noted with increased intracranial pressure. In addition, a subependymal vein is described, which drains the choroid plexus into the internal cerebral vein.