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1/409. Third ventricular lesion masquerading as suprasellar disease.

    We discuss the case of a patient who presented with a bitemporal visual field disturbance thought to arise from chiasmatic compression secondary to a suprasellar mass. The patient was ultimately diagnosed with medulloblastoma with diffuse intraventricular disease. Careful review of magnetic resonance (MR) findings in this case demonstrate the apparent suprasellar mass to be within the suprachiasmatic recess of the third ventricle. The role of MR imaging in distinguishing between suprasellar disease involving the third ventricle and primary third ventricular lesions is discussed.
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keywords = ventricle
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2/409. akinetic mutism after fourth ventricle choroid plexus papilloma: treatment with a dopamine agonist.

    BACKGROUND: akinetic mutism is a behavioral state wherein a patient seems to be awake but does not move or speak. Several patients are reported to have developed mutism after posterior fossa surgery. We present a patient who developed akinetic mutism after total excision of a choroid plexus papilloma of the fourth ventricle, and who was treated with bromocriptine. CASE DESCRIPTION: An 18-year-old woman was admitted with akinetic mutism, which had developed 6 days after posterior fossa surgery. She had had no neurologic deficit in the first 5 days after surgery and could communicate with her family. Despite antioedematous therapy and daily lumbar punctures to drain cerebrospinal fluid, there was no clinical improvement after she entered the akinetic mute state. Brain magnetic resonance revealed ventriculomegaly; brain single photon emission computed tomography revealed bilateral reduction of perfusion in the frontal region. Because daily lumbar drainage did not result in clinical improvement, shunt placement was not considered. bromocriptine therapy was begun at a dose of 2x2.5 mg; 24 hours later, the patient started to speak and move her upper extremities. Further improvement occurred over the following week when the dose was increased to 3x2.5 mg. bromocriptine was replaced with a placebo to determine whether the neurologic improvement was caused by the medicine. The patient's neurologic status deteriorated progressively; therefore, bromocriptine was restarted and she was discharged from the hospital. During the 6 months of follow-up, the patient has remained in good health. CONCLUSIONS: The etiology of akinetic mutism is not clear. Monoaminergic pathways, particularly dopaminergic cell groups, are most probably involved in this syndrome, because bromocriptine has a dramatic effect on these patients, as demonstrated in our case.
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ranking = 2.5
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3/409. Intraventricular cavernomas: three cases and review of the literature.

    OBJECTIVE AND IMPORTANCE: Cavernomas occur very rarely in the ventricular system. We report three cases of intraventricular cavernomas and review the literature. CLINICAL PRESENTATION: A 16-year-old female patient presented with a sudden distal deficit of the left superior limb. She had a voluminous tumor involving the two lateral ventricles, with radiological evidence of recent hemorrhage. A 30-year-old man presented with generalized seizures and a right hemiplegia related to a 4-cm-diameter cavernoma in the two lateral ventricles involving the interhemispheric scissure through the corpus callosum and left centrum ovale. The radiological appearance was not typical and did not allow the diagnosis. A 42-year-old man had a cavernoma in the third ventricle, which was responsible for his short-term memory loss. This cavernoma had been revealed by computed tomography that was performed after intracerebral hemorrhage related to another cavernoma in the right parietal lobe occurred. INTERVENTION: Stereotactic biopsies allowed the diagnosis of intraventricular cavernoma in the first case. Surgical removal via a right transcortical transventricular approach and a transcallosal approach in the first and second cases, respectively, was complete, resulting in good outcomes. Surgical removal via a right transcortical transventricular approach in the third case was partial. CONCLUSION: Intraventricular cavernomas are so uncommon that only 42 well-documented cases have been previously reported in the literature. It seems that their radiological diagnosis may be difficult because of their uncommon location in the ventricular system and their voluminous size. A wrong preoperative diagnosis has sometimes been the cause of inefficient therapy, such as radiotherapy, for these surgically curable benign lesions.
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ranking = 1.500669353108
keywords = ventricle, cerebral
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4/409. pulmonary edema after resection of a fourth ventricle tumor: possible evidence for a medulla-mediated mechanism.

    A well-recognized fact is that some patients may have development of pulmonary edema in association with disorders of the central nervous system. The origin of this phenomenon, known as neurogenic pulmonary edema, is unclear but may result, in part, from select pulmonary venoconstriction modulated by autonomic outflow from the medulla oblongata. We describe a 21-year-old man who had development of pulmonary edema in association with surgical resection of a brain tumor that was close to the medulla. Other than the possibility of medullary dysfunction, which could have occurred after surgical manipulation, no other risk factor for pulmonary edema was identified. Of note, the patient's blood pressure remained normal throughout the perioperative period, and no fluid overload or primary cardiac dysfunction was evident. This case supports the theory that the medulla is an important anatomic site of origin for neurogenic pulmonary edema and that alterations in medullary function can induce pulmonary edema in humans, independent of systemic hypertension.
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keywords = ventricle
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5/409. choroid plexus papilloma. I. Proof of cerebrospinal fluid overproduction.

    Utilizing a ventricular perfusion technique, the rate of CSF formation was determined in a 2-year-old child before and after removal of a 74 g choroid plexus papilloma from the left lateral ventricle. Preoperatively, the CSF formation rate was 1.05 /- SD 0.01 ml/min (1,656 ml/day). Postoperatively, the CSF formation rate was reduced fivefold to 0.20 /- SD 0.01 ml/min (288 ml/day). Whereas these data are regarded as conclusive evidence of CSF overproduction by a choroid plexus papilloma, the pathogenesis of generalized ventricular enlargement in this case was due to part to obstruction of the subarachnoid pathways.
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ranking = 0.5
keywords = ventricle
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6/409. Intraventricular meningiomas: MR imaging and MR spectroscopic findings in two cases.

    CT, MR imaging, MR spectroscopy, and angiography were performed in two men (ages 21 and 48, respectively) with intraventricular meningioma. In both cases, CT and MR imaging showed large tumors located in the trigone of the right lateral ventricle that enhanced intensely after contrast administration. MR spectroscopy was helpful in supporting a preoperative diagnosis of meningioma in both cases.
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keywords = ventricle
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7/409. Presumed intraventricular meningioma treated by embolisation and the gamma knife.

    A 58-year-old woman with a presumed incidentally discovered meningioma in the left lateral ventricle was treated by superselective embolisation and gamma knife therapy. The diameter of the tumour was 40 mm, and its main feeding artery was the left lateral posterior choroidal artery. This vessel was embolised with microcoils. At 8 months following embolisation, the diameter of the tumour had decreased and was stable. The gamma knife was chosen as an adjuvant therapy for the further control 13 months after embolisation. Embolisation and gamma knife therapy may be an alternative treatment for meningiomas where surgical resection appears difficult.
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ranking = 0.5
keywords = ventricle
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8/409. Mature teratoma of the lateral ventricle: report of two cases.

    In this paper, two cases with mature teratoma of the lateral ventricle are presented. Teratomas are rare intracranial tumours and the most common location is in the midline pineal region. Lateral ventricle as the site of location is very rare. Between the years 1975 and 1996, 120 cases were operated on for lateral ventricle tumours at the University of Ankara, Department of neurosurgery, and only two cases (% 1.6) were histologically identified as mature teratomas. It is generally accepted that benign teratomas are radioresistant and total removal of these tumours results in cure. If mature teratoma of the lateral ventricle is totally removed, as done in our cases, the prognosis is usually good.
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ranking = 4
keywords = ventricle
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9/409. Growing patterns of cavernous angioma in the fourth ventricle. Case report.

    Cavernous malformations are vascular lesions that occur in all parts of the central nervous system but most commonly in the cerebral hemispheres; unusually they may be found along the midline (basal ganglia, pineal region or brain stem), into the ventricle possibly encroaching upon the fourth and third ventricle. We report a case of midline cavernomas of the IV ventricle, that grew to large size in-time, demonstrating the capacity for rapid expansion.
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ranking = 3.500669353108
keywords = ventricle, cerebral
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10/409. Pineoblastoma showing unusual ventricular extension in a young adult--case report.

    A 19-year-old male presented with a 4-week history of headache. Neurological examination showed bilateral papilledema. Computed tomography revealed a pineal region mass with remarkable obstructive hydrocephalus. magnetic resonance imaging showed a pineal region tumor continuously invading through the tectum into the cerebral aqueduct and the fourth ventricle with the preservation of the adjacent structures. The tumor appeared an iso- to hypointense mass on T1-weighted images, a heterogeneous iso- to hyperintense mass on T2-weighted images, and a heterogeneously enhanced mass after administration of contrast medium. Histological examination after endoscopic biopsy confirmed that the tumor was a pineoblastoma. radiotherapy was given to the whole brain and the spinal cord, and magnetic resonance imaging showed complete remission of the tumor. Pineoblastomas are highly malignant tumors with seeding potential through the neighboring ventricle or along the meninges, and this type of tumor becomes larger with local extension. We found no previous reports of the continuous extension into the fourth ventricle. The present case showed ventricular extension with minimal mass effect to adjacent structures, and did not disturb ventricular configuration. According to the unusual finding of ventricular extension, this rare case of pineoblastoma requires adjuvant chemotherapy.
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ranking = 1.500669353108
keywords = ventricle, cerebral
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