I have arachnoid cysts in my brain, I suffer from MOST of the symptoms listed for them, including severe migraines, nausea, vomiting, balance problems, short term memory issues, insomnia and a few others I've probably forgotten. I'm SO tired of these doctors telling me my headaches have NOTHING to do with my cysts...BULL. I'm joining your site, I really need to figure out how to deal with my problems, because it appears I am 'stuck' with them no matter what now. My cysts are connected to the flow of spinal fluid in my brain so draining them is not a good option for me. This condition has really messed with my life, and I'm just trying to muttle through feeling half way human. And it seems my doctors do not want to 'help'. I do have digital pictures of my MRI and my cyst are what I would consider 'large'. I really need help getting medical help with this condition :-(

Indications; --Abnormal CT; Fell & Hit Head
Report filed 11/13/01 at 15:18

History: Recent fall with abnormal head CT.
MRI of the head 11/12/01
Imaging was performed without and with IV Gadolinium enhancement.


There is marked dilitation and expansion of the left lateral ventricle posteriorly involving the occipital and temporal horns as well as the atrium. There is some associated encephalomalacia extending into the left parieto-occipital lobe regions. There is also some deviation of the septum pellucidum to the right. The remaining ventricles and basilar citerns are within normal limits without mass effect or midline shift.The corpus callosum is some what thinned posteriorly but still appears to be intact to the splenium. The remaining midline structures are unremarkable.

No other abnormal signal intensity or enhancement is seen and there are no extra-axial fluid collections.
1) Marked dilitation of the occipital horn, atrium and temporal horn of the left lateral ventricle with some associated encephalomalacia in the left parieto-occipital lobe regions. This is felt to represent a developmental variant of no clinical significance.
2) Otherwise negative.

EEG Report 11/28/01

The eeg is a 16-channel record on a patient age 33, There is a history of head injury and headaches.

The alpha rhythm is a 9, moderate voltage. Anterior beta is minimal. There is slightly increased beta activity at times mainly in the bicentral to bifrontal areas. on this background there were occasional bursts of repetitive sharp activity, phase reversing in the left mid to posterior central and reflecting into left temporal and right temporal areas. No clinical accompaniment. The electrocardiogram shows sinus rhythm throughout.

Photic stimulation at frequency 1-30 showed some driving affect around 6-16. No induced abnormality.

Hyperventilation did not reveal additional features. There was a slight increase in general slow activity and some of the bursts of sharp activity persisted in the left central area but did not seem to increase in frequency or duration.

Abnormal EEG. There were burst of phase reversing sharp activity left mid to posterior central seen during the awake and drowsy portions of the record and also during hyperventilation, but without increased frequency of this during hyperventilation. This does appear to be focal region of cortical irritability.

Exam Date 09/13/2002

MRI/Brain with and without contrast

Indication: Follow up arachnoid cyst.

Head MRI Including gadolinium iv contrast enhancement 09/13/02

Examination shows area of ventricular dilatation and expansion of the left lateral ventricle in the region of the atrium and slight extension into the left temporal lobe. There appears to be communication of this dilated ventricle to the DFS space in the supra-cerebellar cistern region. There is atrophy involving the white matter of the left parietal lobe.

It is difficult to determine with certainty but I believe the communication to the CFS region is probably lined by gray matter. I suspect these findings may reflect changes of porencaphaly / encephalomalacia rather than a true arachnoid cyst.

In any event these findings are unchanged compared to 11/21/01. This measures up to 5 cm in maximum transverse diameter and is stable in size compared to the earlier study. There is no abnormal contrast enhancement. The remainder of the ventricular system is normal in size.

1) Stable dilatation of the atrium and left temporal horn region of the left lateral ventricle. This is unchanged in size compared to 11/07/01. This appears to have communication to the supra-cerebellar cistern region. This could reflect changes of previous porencephaly / encephalomalacia or intraventricular arachnoid cyst are less likely. There is atrophy involving thte white matter of the left parietal lobe as well as atrophy extending in the hippocampal region of the left temporal lobe.

Exam Date 05/04/2004 MRI/Brain with and without contrast
MRI Brain:
Multiple routine images were obtained and compared to the 9/13/02 study. The examination again demonstrates dilatation of the occipital horn and atrium of the left lateral ventricle extending into the temporal horn. There is also enlargement of the supercerebellar cistern. The appearance is identical to the examination of 9/13/02. As noted previously there is mild atrophy of the overlying cerebral mantle. There is no abnormal contrast enhancement or mass effect. Minimal areas of nodularity are seen in both maxillary sinuses suggesting small polyps or rentention cysts. The remainder of the visualized paranasal sinuses are clear.

Unchanged dilitation of the posterior horn of the left lateral ventricle including the atrium, occipital horn extending into the temporal horn with loss of cortex to the cerebral mantle. No new enhancing lessions or mass effect seen. Minimal areas of nodularity in both maxillary sinuses consistent with small retention cysts or polyps.

Exam Date 12/27/04
CT Head Scan

Findings: 5mm axial images of the head was obtained without IV contrast. There are no comparison studies available at the time of reporting.

There is dilatation of the left lateral ventricle posteriorly. Findings could reflect an intraventricular arachnoid cyst or congenital dilataion. Mazimum transverse dimention measures 3.7 x 6.2 cm. Patient states that she has a known intracranial cyst. I do not see evidence of an acute intracranial abnormality.