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Great Galen vein aneurysms are rare intracranial vascular malforma-tions which are especially seen in the neonatal period. They comprise a diverse group of vascular anomalies, and different classifications are described in the literature [1]. Hemodynamically, Galen vein aneurysms are classified into two types. One type comprises the true vein of Galen malformations (VOGMs), which constitute 1% of all intracranial vascu-lar malformations and most commonly affect the neonatal population, in whom congestive heart failure is the primary presentation. These le-sions are characterized by the presence of an aneurysmally dilated deep venous structure, fed by abnormal arteriovenous communications. The second classification is Galen vein aneurysmatic dilatation due to high flow parenchymal arteriovenous malformation (AVM), which produces engorgement and dilatation of the Galen vein. We report a rare case of Galen vein aneurysm caused by AVM leading to obstruction at the cere-bral aqueduct. A 57-year-old man with metastatic lung cancer presented to the neu-rology department with complaints of fatigue and insomnia. The physical examination revealed mild motor weakness at the left arm. The other neurological tests were normal. The blood test results showed mild anemia due to chronic disease, increased low-density lipoproteins (LDH) and decreased levels of 25-hydroxy vitamin D. Brain magnetic resonance imaging (MRI) was performed (1.5 Tesla, Siemens, Avanto, Erlangen, Ger-many) and revealed multiple metastatic lesions in cerebral and cerebellar hemispheres with heterogeneous contrast enhancement and diffuse va-sogenic edema around the lesions on T2 weighted images (Figure 1 A). The arteriovenous malformation was visualized at the deep medial part of the left temporo-occipital lobe. The nidus was seen at the central part of the AVM after contrast administration (Figure 1 B). The arterial feeder was the posterior cerebellar artery, and the venous drainage was supplied by the internal cerebral vein, which drains into the Galen vein. The Galen vein was observed to be aneurysmatic due to increased blood flow and probably due to obstruction. The aneurysmatic Galen vein caused obstruction at the level of the cerebral aqueduct, leading to noncommu-nicating hydrocephalus (Figures 2 A, B). The vein of Galen, also named the great cerebral vein, is a venous structure formed by the two internal cerebral veins and the basal veins of Rosenthal and lies at the quadrigeminal cistern. The VOGMs are very rare congenital vascular malformations constituting 1% of all intracrani-al vascular malformations at any age, but it rises to 30% in the neonatal period. They result from abnormal connections between …

Hydrocephalus due to Galen vein aneurysm associated with arteriovenous malformation in an adult patient