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Biomedical subjects

K Ogane

Publications and source records attributed to K Ogane.

7 recordsLinked to original sources
PubMed1992

[Two cases of failure of a programmable pressure valve].

Two cases of a programmable pressure valve trouble are reported. Case #1 was that of a 49-year-old male who had received a ventriculoperitoneal shunt (VPS) using a Sophy programmable pressure valve (Model S3) after the removal of the fourth ventricle ependymoma. After the VPS, the patient went through several episodes of complaining of headache due to the spontaneous movement of the rotor from the high pressure position to the medium or low pressure position. The symptom had disappeared after exchanging the valve for a new one and by setting the valve pressure at high. Examination of the removed valve revealed that the bending-degree of the spring tip was insufficient, and that the opening pressures at the medium and high pressure positions were both lower than the desired range. Case #2 was that of a 62-year-old female who had received a VPS for normal pressure hydrocephalus using a Sophy programmable pressure valve (Model S3) with the valve pressure set a high. However, her symptoms did not improve, so an attempt was made to change the valve pressure from the high pressure position to the medium pressure position with a ring magnet. But the rotor could not be moved. The valve was exchanged and the valve pressure was set at medium, and the symptoms of the patient improved postoperatively. Examination of the removed valve revealed that the movement of the rotor with a ring magnet was not able to be carried out smoothly.(ABSTRACT TRUNCATED AT 250 WORDS)

Cerebral Ventricle Neoplasms↗
PubMed1991

[P3 portion aneurysm of the posterior cerebral artery; a case report].

A case was reported of surgically treated saccular aneurysm located at the right posterior temporoparietooccipital artery junction (P3 portion of PCA). An aneurysm of this portion is said to be rare, and only 7 cases have been described so far. A 74-year-old female was transferred to our clinic, after 3, 5 months of sustaining aneurysmal rupture, for surgical treatment. The patient had been treated conservatively because of her severe condition in the early stage. She was in nearly apallic state with left hemiparesis at the time of admission to our clinic. During the acute stage of her illness, moderate hematoma in the right ambient cistern without hydrocephalus, and an aneurysm at P3 portion of the right posterior cerebral artery with marked arteriosclerosis were delineated by CT, and by right vertebral angiography respectively. However, in the CT taken 3, 5 months after the onset, moderate hydrocephalus and a low density area in the right internal capsule were detected. Aneurysmal neck clipping was performed using the right posterior subtemporal approach, without any deformity of the parent arteries. Occlusion of the right parietooccipital artery occurred, however, probably on the 2nd postoperative day. Despite the newly developed left homonymous hemianopsia, general condition, including consciousness level, improved postoperatively particularly after the ventriculo-peritoneal shunt was carried out.

Aged↗
PubMed1990

[Subependymoma of the septum pellucidum. MRI features and its usefulness in planning surgery].

A 61-year-old female was referred because of headache and gait disturbance. A computed tomography (CT) scan revealed a midline isodense mass lesion. The limit of the tumor was equivocal even after administration of contrast medium. Magnetic resonance imaging (MRI) study, however, clearly showed the relationship between the tumor and the surrounding structures, such as the corpus callosum, the ventricular cavities. The tumor had originated from the region of the septum pellucidum and positioned just beneath the corpus callosum from the genu to the splenium with the roof of the third ventricle pushed downward. The tumor was totally extirpated via the interhemispheric paratranscallosal route. The tumor was typical subependymoma. The post-operative course was uneventful. Transient psychiatric disturbance and inability to retain recent memory were observed and the former subsided in several weeks. CT and MRI characteristics of subependymoma are summarized and the usefulness of MRI to locate tumors and to plan proper surgical approaches are emphasized.

Cerebral Ventricle Neoplasms↗
PubMed1990

[Disproportionately large communicating fourth ventricle with bilateral exotropia: report of two cases].

Two cases of disproportionately large communicating fourth ventricle (DLCFV) accompanied by consciousness disturbance and bilateral exotropia are reported. Case #1 was a 21-year-old male who suffered from consciousness disturbance and bilateral exotropia due to malfunction of the ventriculoperitoneal shunt (VPS) which had previously been operated on twice for a left parietal arteriovenous malformation, which had caused ventricular hemorrhage several times. The last hemorrhage was massive and made ventricular casting, including the fourth ventricle. Both bilateral exotropia and the fourth ventricular dilatation were well controlled by the reconstruction of the VPS. Case #2 was a 66-year-old female, semicomatous because of massive subarachnoid hemorrhage with ventricular casting hematoma due to rupture of the right middle cerebral aneurysm. Though an improvement of the consciousness disturbance was obtained by continuous ventricular drainage (CVD), bilateral exotropia and consciousness deterioration appeared after lumboperitoneal shunt followed by the removal of the CVD. Another CVD was then carried out and some improvement was obtained again. However, the same symptoms appeared again after the VPS, followed by the removal of the CVD. The patient finally died despite a third CVD. Autopsy revealed a markedly dilated fourth ventricle and massive subarachnoid clots particularly around the foramen of Magendie and Luschka. The pathogenesis of DLCFV and bilateral exotropia are also discussed.

Adult↗
PubMed1990

[Cyst formation of meningioma: report of two cases and review of literature].

Cystic meningioma is rare and said to account for 1 to 2% of all types of meningioma. Here we report two cases of cystic meningioma. Case 1 is a 25-year-old man. He had suffered from sporadic epileptic seizure for about two years until the first CT was performed. It revealed a large cystic lesion at the right parietal region in touch with the midline structure. A nodular high density area was delineated in the contrast enhanced CT on the medial wall of the cyst. He showed no neurological abnormality at all. Case 2 is a 56-year-old female who had been complaining of memory disturbance, and an episode of sudden dizziness followed by a syncope that lasted for a few minutes. Neurological examination revealed slight right hemiparesis, right homonymous hemianopsia and left papilledema. A large cystic lesion was delineated at the temporal region in the plain CT, and no positively enhanced region could be found in the contrast enhanced CT. After surgical removal of the tumors, both cases were identified as cases of meningioma. They were diagnosed histopathologically as a fibroblastic meningioma and a meningotheliomatous meningioma respectively. The wall of the cyst consisted of the cortical surface per se in both cases. Preoperative diagnosis of such cases and the mechanism by which the cyst is formed were also discussed.

Adult↗