Truncal contrapulsion in association with pretectal syndrome has not been described previously. We report a patient with vertical-gaze palsy and severe truncal contrapulsion due to an infarction in the mesodiencephalic junction. Truncal contrapulsion in this patient may have resulted from the disruption of the ascending fibers in the crossed cerebellothalamic tract.
Humans ; Infarction ; Mesencephalon ; Paralysis

No abstract available.
Diplopia ; Infarction ; Mesencephalon ; Paralysis

No abstract available.
Ataxia* ; Brain Stem Neoplasms* ; Mesencephalon*

Upbeat nystagmus has been described in bilateral lesions of the medulla, the ventral tegmentum, the anterior cerebellar vermis, the adjacent brachium conjunctivum, and the midbrain. Imbalance of the vertical vestibulo- ocular reflex (VOR) favoring the downward VOR activity would therefore result in upbeat nystagmus. We report a patient with transient upbeat nystagmus due to unilateral pontine infarction that may have disrupted bilateral upward VOR pathways running in the ventral tegmental tracts.
Humans ; Infarction* ; Mesencephalon ; Reflex ; Running

No abstract available.
Fetus* ; Humans* ; Mesencephalon* ; Serotonergic Neurons*

No abstract available.
Goats* ; Mesencephalon* ; Periaqueductal Gray* ; Somatostatin*

The authors report a case of rostral mesencephalic dysfunction due to obstructive hydrocephalus secondary to periaqueductal tumor who suffered multiple shunt failures and shunt revision. This patient presented with clinical syndromes, including akinetic mutism and diencephalic autonomic epilepsy. He had computed tomography(CT) and magnetic resonance(MR) findings of dilatation of ventricular system with periaqueductal tumor. The anatomical substrates of clinical findings are reviewed. A discussion of the probable mechanism proposes that dilatation of 3rd ventricle and rostral aqueduct sufficiently explains the entire syndrome.
Akinetic Mutism ; Dilatation ; Epilepsy ; Humans ; Hydrocephalus* ; Mesencephalon*

No abstract available.
Infarction ; Mesencephalon ; Ocular Motility Disorders ; Paralysis

The thalamic vascular supply is categorized into the anterior, paramedian, inferolateral, and posterior territories. The artery of Percheron (AOP), a solitary trunk that is an uncommon anatomic variant, provides bilateral arterial supply to the paramedian thalami and the rostral midbrain. Occlusion of this artery results in bilateral thalamic and mesencephalic infarctions. The case described herein is of a patient with AOP who presented with the sudden onset of lethargy.
Arteries ; Humans ; Infarction ; Lethargy ; Mesencephalon ; Thalamus

The thalamic vascular supply is categorized into the anterior, paramedian, inferolateral, and posterior territories. The artery of Percheron (AOP), a solitary trunk that is an uncommon anatomic variant, provides bilateral arterial supply to the paramedian thalami and the rostral midbrain. Occlusion of this artery results in bilateral thalamic and mesencephalic infarctions. The case described herein is of a patient with AOP who presented with the sudden onset of lethargy.
Arteries ; Humans ; Infarction ; Lethargy ; Mesencephalon ; Thalamus