Damiano T R, Truwit C L, Dowd C F, Symonds D L, Portela L, Dreisbach J
Department of Radiology, Fitzsimons Army Medical Center, Aurora, Colo.
AJNR Am J Neuroradiol. 1994 Apr;15(4):643-52.
To describe 11 cases of posterior fossa venous angiomas with drainage through the brain stem.
Eleven cases of posterior fossa venous angioma with drainage through the brain stem were evaluated using MR. Correlation with known routes of venous drainage for the cerebellum and brain stem is made.
Six of the 11 venous angiomas were found in the cerebellum, four in the brain stem; one involved both the cerebellum and brain stem. The cerebellar venous angiomas drained to subependymal veins about the fourth ventricle and dorsal pons. These then connected with an enlarged transmesencephalic or transpontine vein, to drain anteriorly to the anterior pontine veins. The brain stem angiomas had variable drainage depending on location. Evidence of hemorrhage was seen in five cases.
Cerebellar and brain stem venous angiomas have several potential routes of drainage, including an enlarged vein traversing the pons, midbrain, or medulla. A knowledge of the normal venous anatomy of this region helps to understand the occurrence of these uncommon routes of venous drainage.
描述11例经脑干引流的后颅窝静脉血管瘤。
对11例经脑干引流的后颅窝静脉血管瘤进行磁共振成像（MR）评估，并与小脑和脑干已知的静脉引流途径进行对比。
11例静脉血管瘤中，6例位于小脑，4例位于脑干，1例同时累及小脑和脑干。小脑静脉血管瘤引流至第四脑室周围的室管膜下静脉和脑桥背侧。这些静脉随后与增粗的经中脑或经脑桥静脉相连，向前引流至脑桥前静脉。脑干血管瘤的引流情况因位置而异。5例可见出血迹象。
小脑和脑干静脉血管瘤有几种潜在的引流途径，包括一条穿过脑桥、中脑或延髓的增粗静脉。了解该区域的正常静脉解剖有助于理解这些不常见静脉引流途径的发生情况。
