Diagnosis: Cerebral cysts Communicating hydrocephalusClinical question: arachnoid cyst and hydrocephalus, yearly evaluationSigns and Symptoms: yearly evaluation There is redemonstration of a large cystic lesion present within the fourth ventricle measuring 35 x 75 mm in sagittal dimensions and previously measuring the same. It expands the fourth ventricle. The quadrigeminal plate as well as the cerebellar hemispheres drape around this cyst. The pineal gland is displaced superiorly. The vena Galen and straight sinus are also displaced by this cystic mass. It appears to extend through the foramina of Luschka. It follows CSF on all pulse sequences.The patient is status post ventriculostomy tube placement. A ventriculostomy tube courses to the right frontal lobe into the right lateral ventricle with tip in the region of foramen of Monro in the third ventricle. The lateral ventricles remain slitlike. In general the corpus callosum is relatively thin especially along its posterior aspect.Normal vascular flow voids are present in the distal carotid and vertebral arteries, the basilar artery and the proximal anterior, middle and posterior cerebral arteries as well as the internal cerebral veins and superior sagittal sinus.The visualized portions of the paranasal sinuses are clear. The visualized portions of the mastoid air cells are clear. The visualized portions of the orbits are intact.
1.There is an intraventricular arachnoid cyst centered in the fourth ventricle which is stable in appearance when compared to the previous exam from 8/20/20122.A ventriculostomy tube is in stable position. The lateral ventricles and third ventricle remain slitlike.