Fourth ventricular schwannoma

1990 ◽  
Vol 73 (5) ◽  
pp. 777-781 ◽  
Author(s):  
Gary Redekop ◽  
Kost Elisevich ◽  
Joseph Gilbert
Keyword(s):  
Fourth Ventricle ◽  
Content Type ◽  
Radiographic Features ◽  
Unusual Location ◽  
Pontomedullary Junction ◽  
Fine Print

✓ A schwannoma arising from the dorsum of the pontomedullary junction and presenting as an exophytic mass in the fourth ventricle is described. A ventricular schwannoma has not previously been reported in the literature. The presenting clinical and radiographic features and the pathology of this tumor are summarized, and an explanation is sought for its unusual location.

Unusual causes of trigeminal neuralgia treated by gamma knife radiosurgery

2002 ◽  
Vol 97 ◽  
pp. 533-535 ◽  
Author(s):  
Jin Woo Chang ◽  
Jae Young Choi ◽  
Young Sul Yoon ◽  
Yong Gou Park ◽  
Sang Sup Chung
Keyword(s):  
Trigeminal Neuralgia ◽  
Gamma Knife ◽  
Fourth Ventricle ◽  
Gamma Knife Radiosurgery ◽  
Brain Magnetic Resonance Imaging ◽  
Resonance Imaging ◽  
Segmental Demyelination ◽  
Content Type ◽  
Clinical Responses ◽  
Fine Print

✓ The purpose of this paper was to present two cases of secondary trigeminal neuralgia (TN) with an unusual origin and lesion location. In two cases TN was caused by lesions along the course of the trigeminal nerve within the pons and adjacent to the fourth ventricle. Both cases presented with typical TN. Brain magnetic resonance imaging revealed linear or wedge-shaped lesions adjacent to the fourth ventricle, extending anterolaterally and lying along the pathway of the intraaxial trigeminal fibers. The involvement of the nucleus of the spinal trigeminal tract and of the principal sensory trigeminal nucleus with segmental demyelination are suggested as possible causes for trigeminal pain in these cases. It is postulated that these lesions are the result of an old viral neuritis. The patients underwent gamma knife radiosurgery and their clinical responses have been encouraging to date.

Teratoma of the fourth ventricle

1973 ◽  
Vol 38 (3) ◽  
pp. 355-357 ◽  
Author(s):  
Robert J. Morelli
Keyword(s):  
Fourth Ventricle ◽  
Rare Case ◽  
Surgical Removal ◽  
Malignant Teratoma ◽  
Content Type ◽  
Fine Print

✓ The author reports a rare case in which a primary malignant teratoma presented as an obstructing mass in the fourth ventricle. The tumor was not cystic but well encapsulated, and a gross total surgical removal was accomplished. A fatal recurrence occurred within 3 months.

Axillary nerve entrapment in the quadrilateral space

1987 ◽  
Vol 66 (6) ◽  
pp. 932-934 ◽  
Author(s):  
H. Carson McKowen ◽  
Rand M. Voorhies
Keyword(s):  
Upper Extremity ◽  
Shoulder Pain ◽  
Posterior Approach ◽  
Axillary Nerve ◽  
Nerve Entrapment ◽  
Neutral Position ◽  
Circumflex Artery ◽  
Content Type ◽  
Radiographic Features ◽  
Fine Print

✓ The quadrilateral space syndrome is a recently established entity with seemingly consistent pathological and radiographic features. An example of this syndrome is reported. In this patient, entrapment of the axillary nerve by fibrous bands in the quadrilateral space caused shoulder pain with paresthesias in the upper extremity. Subclavian angiography provided the diagnosis by demonstrating that the posterior humeral circumflex artery, which was normal when the arm was in a neutral position, was occluded when the arm was abducted and externally rotated. Axillary neurolysis through a posterior approach resulted in relief of symptoms.

Transcerebellomedullary fissure approach with special reference to the methods of dissecting the fissure

2001 ◽  
Vol 94 (2) ◽  
pp. 257-264 ◽  
Author(s):  
Toshio Matsushima ◽  
Tooru Inoue ◽  
Takanori Inamura ◽  
Yoshihiro Natori ◽  
Kiyonobu Ikezaki ◽  
...  
Keyword(s):  
Fourth Ventricle ◽  
Posterior Margin ◽  
Lateral Wall ◽  
Microsurgical Anatomy ◽  
Optimal Method ◽  
Content Type ◽  
Lateral Recess ◽  
Tela Choroidea ◽  
Opening Method ◽  
Fine Print

Object. The purpose of the present study was to refine the transcerebellomedullary fissure approach to the fourth ventricle and to clarify the optimal method of dissecting the fissure to obtain an appropriate operative view without splitting the inferior vermis. Methods. The authors studied the microsurgical anatomy by using formalin-fixed specimens to determine the most appropriate method of dissecting the cerebellomedullary fissure. While dissecting the spaces around the tonsils and making incisions in the ventricle roof, the procedures used to expose each ventricle wall were studied. Based on their findings, the authors adopted the best approach for use in 19 cases of fourth ventricle tumor. The fissure was further separated into two slit spaces on each side: namely the uvulotonsillar and medullotonsillar spaces. The floor of the fissure was composed of the tela choroidea, inferior medullary velum, and lateral recess, which form the ventricle roof. In this approach, the authors first dissected the spaces around the tonsils and then incised the taenia with or without the posterior margin of the lateral recess. These precise dissections allowed for easy retraction of the tonsil(s) and uvula and provided a sufficient view of the ventricle wall such that the deep aqueductal region and the lateral region around the lateral recess could be seen without splitting the vermis. The dissecting method could be divided into three different types, including extensive (aqueduct), lateral wall, and lateral recess, depending on the location of the ventricle wall and the extent of surgical exposure required. Conclusions. When the fissure is appropriately and completely opened, the approach provides a sufficient operative view without splitting the vermis. Two key principles of this opening method are sufficient dissection of the spaces around the tonsil(s) and an incision of the appropriate portions of the ventricle roof. The taenia(e) with or without the posterior margin of the lateral recess(es) should be incised.

Fourth ventriculoceles with extracranial extension

1984 ◽  
Vol 61 (2) ◽  
pp. 348-350 ◽  
Author(s):  
Robert A. Fenstermaker ◽  
Uros Roessmann ◽  
Harold L. Rekate
Keyword(s):  
Cerebrospinal Fluid ◽  
Clinical Outcome ◽  
Fourth Ventricle ◽  
Pathological Findings ◽  
Direct Communication ◽  
Content Type ◽  
Cyst Excision ◽  
Occipital Encephalocele ◽  
Fine Print

✓ The radiographic features and long-term clinical outcome in three patients who presented at birth with a cystic suboccipital mass in direct communication with the fourth ventricle are reviewed. The pathological findings in a fourth infant who died are also discussed. All surviving infants were treated with cyst excision and diversion of cerebrospinal fluid. The prognosis in these children, followed from 6 to 20 years, surpasses that of the more common occipital encephalocele, for which this entity could be mistaken. The morphogenetic implications relative to more common congenital lesions in this location are discussed.

Hydrocephalus due to membranous obstruction of the fourth ventricle

1971 ◽  
Vol 35 (6) ◽  
pp. 672-676 ◽  
Author(s):  
A. Loren Amacher ◽  
Larry K. Page
Keyword(s):  
Posterior Fossa ◽  
Fourth Ventricle ◽  
Clinical Findings ◽  
Posterior Fossa Tumor ◽  
Cerebellar Development ◽  
Rare Entity ◽  
Content Type ◽  
Operative Findings ◽  
Membranous Obstruction ◽  
Fine Print

✓ Four patients with hydrocephalus due to membranous obstruction of the fourth ventricle are presented. This rare entity produced radiographic and clinical findings suggestive of posterior fossa tumor. Operative findings included normal cerebellar development and a translucent membrane just above the foramen of Magendie. Etiological possibilities are discussed.

Endoscopic removal of cysticercal cysts within the fourth ventricle

1999 ◽  
Vol 91 (2) ◽  
pp. 340-345 ◽  
Author(s):  
Marvin Bergsneider
Keyword(s):  
Fourth Ventricle ◽  
Treatment Options ◽  
Primary Treatment ◽  
Surgical Removal ◽  
Endoscopic Removal ◽  
Content Type ◽  
Suboccipital Craniectomy ◽  
The Mean ◽  
Optimum Management ◽  
Fine Print

✓ There is no consensus as to the optimum management of patients who harbor cysticercal cysts within the fourth ventricle. Compared with the alternative treatment options of anthelmintic medication and/or cerebrospinal fluid shunt placement, the surgical removal of the cyst has the advantage of eliminating the inflammatory nidus and potentially obviating the need for a complication-prone shunt. Here, an endoscopic surgical approach is described and proposed as an alternative to the standard suboccipital craniectomy for removal of cysticercal cysts within the fourth ventricle.A retrospective analysis of five consecutive endoscopic cases was performed. Endoscopic removal of all cysts within the fourth ventricle was successful in each case. The mean length of operative time was short and blood loss was insignificant. The endoscopic procedure was safe and associated with minimal postoperative discomfort in most patients.In properly selected patients, the endoscopic removal of cysticercal cysts located within the fourth ventricle should be considered as the primary treatment for this condition.

Isolated fourth ventricle as a complication of ventricular shunting

1978 ◽  
Vol 49 (6) ◽  
pp. 910-913 ◽  
Author(s):  
John C. Hawkins ◽  
Harold J. Hoffman ◽  
Robin P. Humphreys
Keyword(s):  
Computerized Tomography ◽  
Fourth Ventricle ◽  
Obstructive Hydrocephalus ◽  
Normal Function ◽  
Shunt Malfunction ◽  
Cerebellar Dysfunction ◽  
Content Type ◽  
Isolated Fourth Ventricle ◽  
Ventricular Shunting ◽  
Fine Print

✓ Signs of cerebellar dysfunction combined with signs suggestive of shunt malfunction developed in three children with obstructive hydrocephalus. Shunt function was normal. In all cases, the cerebellar signs persisted and computerized tomography scans revealed enlargement of the fourth ventricle. Shunting of the fourth ventricle returned the patients to normal function.

Histiocytic lesion mimicking intrinsic brainstem neoplasm

1999 ◽  
Vol 91 (6) ◽  
pp. 1037-1040 ◽  
Author(s):  
Kyle D. Weaver ◽  
Diane Armao ◽  
Joseph M. Wiley ◽  
Matthew G. Ewend
Keyword(s):  
Differential Diagnosis ◽  
Fourth Ventricle ◽  
Pathological Examination ◽  
Subtotal Resection ◽  
Imaging Studies ◽  
Content Type ◽  
Brainstem Lesions ◽  
History Of ◽  
Initial Imaging ◽  
Fine Print

✓ This 10-year-old girl presented with a 1-month history of progressive bulbar palsy and a solitary enhancing mass originating within the floor of the fourth ventricle. Results of initial imaging studies and presentation were suggestive of neoplasia. Subtotal resection was performed and pathological examination revealed the mass to be a histiocytic lesion, with no evidence of a glioma. The patient had no other stigmata of histiocytosis and was treated with steroid medications, resulting in prolonged resolution of the lesion. This case demonstrates that for discrete brainstem lesions the differential diagnosis includes entities other than glioma for which treatment is available. Biopsy sampling should be considered when technically feasible.

Compartmentation of the jugular foramen

1972 ◽  
Vol 36 (3) ◽  
pp. 340-343 ◽  
Author(s):  
Robert Shapiro
Keyword(s):  
Jugular Foramen ◽  
Complete Separation ◽  
Content Type ◽  
Radiographic Features ◽  
Fine Print

✓ The radiographic anatomy of the jugular foramen is described. Normal variations in size and configuration are discussed and principal pathological configurations listed. The radiographic features of complete separation of the jugular foramen into separate neural and vascular components are presented.

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