Clinical question: Evaluate arachnoid cyst for change. Compare with previousSigns and Symptoms: Arachnoid cyst The CSF spaces are appropriate for the patient's stated age with no midline shift. There is redemonstration of an 11 x 9 mm axial dimension cystic lesion in the left middle cranial fossa anteriorly which has not changed in dimensions when compared to the previous exam. It is associated with some scalloping of the adjacent sphenoid bone.No abnormal mass lesions are appreciated intracranially. No intracranial hemorrhage is identified. No edema is identified within the brain parenchyma.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.
Stable small left middle cranial fossa arachnoid cyst.