Hidenori Ohbuchi

Nagoya Second Red Cross Hospital, Nagoya, Aichi, Japan

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Publications (13)1.9 Total impact

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    ABSTRACT: Among 238 patients with bilateral trigeminal neuralgia(TN)who visited our hospital between April 2007 and June 2014, 5(2%)were surgically treated by microvascular decompression(MVD). The initial symptom was on the right side in four and on both sides in one patient. Intervals between the initial and second onset on the other side(left)were two months, and four, six, and eight years. None of the patients showed involvement of the first branch of the trigeminal nerve. The patients with bilateral TN were younger than the 154 patients with unilateral TN who were treated surgically by MVD in this period(45 vs. 65 years), and the bilateral TN patients predominantly were women(4/5 vs. 99/154). In the surgical field, the trigeminal nerve and root entry zone were compressed more by veins in the bi lateral TN patients than in the unilateral TN(4/5 vs. 60/154, respectively)patients. We could not identify any differences in MRI CISS before versus after the onset of left trigeminal neuralgia, suggesting that compression is not the sole cause of the symptom.
    No shinkei geka. Neurological surgery 02/2015; 43(2):127-32. DOI:10.11477/mf.1436202967 · 0.13 Impact Factor
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    ABSTRACT: Abstract Ocular ischemic syndrome occurs when ocular circulation becomes impaired owing to various causes, leading to disturbances in the visual function. It ultimately progresses to neovascular glaucoma and loss of sight. Therefore, the early diagnosis and treatment of patients with ocular ischemic syndrome has a major effect on their visual prognosis. Herein, we describe a patient who complained of decreased vision in one eye. The patient was subsequently diagnosed with internal carotid artery stenosis because of neovascularity (rubeosis iridis) around the iris in the anterior eye. The vision of the patient improved immediately after carotid artery stenting. A review of the literature indicated that the visual improvement could be attributed to the reversal of retrograde blood flow, caused by internal carotid artery stenosis, to normal levels; the resolution of rubeosis in the anterior eye; and improvement in the visual field constriction. (Received February 21, 2014; Accepted May 12, 2014; Published December 1, 2014).
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    ABSTRACT: A 59-year-old man presented with right trigeminal neuralgia of the second branch, which had been treated with carbamazepine. The pain could not be controlled adequately because of side effects. CT and MRI revealed a 2-cm lesion in the right cerebellopontine angle. Retrosigmoid lateral suboccipital craniectomy was performed, and a soft yellowish mass was found to be associated with the 5th, 7th, and 8th cranial nerves, anterior inferior cerebellar artery, and small vessels. The lipoma was partially resected from around the root entry zone(REZ)of the 5th nerve and small vessels were coagulated around the REZ. After surgery, there was no trigeminal neuralgia, but facial numbness and cerebellar signs were noted. Postoperative MRI showed decompression of the trigeminal nerve and venous infarction in the middle cerebellar peduncle. Reviewing similar cases, we found 19 lipoma patients presenting with trigeminal neuralgia. Symptoms of involvement of other cranial nerves were also present in 11 patients, and 14 were younger than 30 years old. Of 17 surgical cases, total resection was not attempted apart from one case. Although pain relief was achieved in all surgical cases, complications developed in 11. Surgery should be performed only in patients with disabling and uncontrolled symptoms.
    No shinkei geka. Neurological surgery 12/2014; 42(12):1131-6. DOI:10.11477/mf.1436200048 · 0.13 Impact Factor
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    ABSTRACT: Abstract A 76-year-old woman presented at our hospital complaining of loss of consciousness, dysarthria, and upper extremity paresis. Head CT showed no remarkable findings. 3D CT angiography (CTA) and CT perfusion (CTP) revealed acute aortic dissection (AAD) involving the innominate artery and decreased cerebral blood flow in the right cerebral hemisphere, although there were no clinical signs of AAD. The patient underwent emergency allograft replacement performed by cardiovascular surgeons. The symptoms disappeared within several days and no cerebral infarction developed. Although patients with AAD and neurological symptoms can show a fatal course when they receive tissue plasminogen activator (tPA), it is difficult to exclude patient with AAD as candidates for tPA treatment. Routine use of 3D CTA and CTP in the diagnosis of acute stroke may help overcome the above problem. (Received October 7, 2013; Accepted January 17, 2014; Published August 1, 2014).
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    ABSTRACT: Epidermoid rarely appears in the cavernous sinus. We encountered a 41-year-old man with left abducens nerve palsy. A round-shaped, low-density lesion on CT was located lateral to the left cavernous sinus with a compressed and thinned lateral wall of the sphenoid sinus. We could not identify cranial nerves in the cavernous sinus, which was found to be packed with a non-enhanced, high-intensity tumor on both T1 and T2 MRI. Part of the tumor capsule and its pearly contents were removed with an intradural subtemporal approach, and an inner membranous layer with cranial nerves and a tumor capsule were seen at the bottom of the tumor cavity. Postoperatively, complete cure was achieved. Reviewing similar cases, we found 18 cavernous sinus epidermoids:extracavernous type in 5;interdural in 10;and intracavernous in 3. The interdural type could be further divided into two subtypes:superficial cavernous sinus and inner membranous types. The present case belongs to the former. Frontotemporal and subtemporal procedures via both intra- and extradural approaches are relatively safe for lesions except for the intracavernous type, because cranial nerves are not located in the lateral wall of the tumor. MRI provides more useful information on cranial nerves and aid in choosing a better treatment strategy.
    No shinkei geka. Neurological surgery 02/2014; 42(2):149-55. · 0.13 Impact Factor
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    ABSTRACT: We aimed to determine the sensitivity of CT perfusion (CTP) for the diagnosis of cerebral infarction in the acute stage. We retrospectively reviewed patients with ischemic stroke who underwent brain CTP on arrival and MRI-diffusion weighted image (DWI) after hospitalization between October 2008 and October 2011. Final diagnosis was made from MRI-DWI findings and 87 patients were identified. Fifty-five out of 87 patients (63%) could be diagnosed with cerebral infarction by initial CTP. The sensitivity depends on the area size (s): 29% for S < 3 cm(2), 83% for S ≥ 3 cm(2) - < 6 cm(2), 88% for S ≥ 6 cm(2) - < 9 cm(2), 80% for S ≥ 9 cm(2) - < 12 cm(2), and 96% for S ≥ 12 cm(2) (p < 0.001). Sensitivity depends on the type of infarction: 0% for lacunar, 74% for atherothrombotic, and 92% for cardioembolism (p < 0.001). Sensitivity is not correlated with hours after onset. CT perfusion is an effective imaging modality for the diagnosis and treatment decisions for acute stroke, particularly more serious strokes. J. Med. Invest. 61: 41-45, February, 2014.
    The Journal of Medical Investigation 01/2014; 61(1.2):41-5. DOI:10.2152/jmi.61.41
  • Surgery for Cerebral Stroke 01/2013; 41(4):269-275. DOI:10.2335/scs.41.269
  • Surgery for Cerebral Stroke 01/2013; 41(3):187-190. DOI:10.2335/scs.41.187
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    ABSTRACT: We reported a case of trigonal cavernous malformation (CM) with intraventricular hemorrhage. This 67-year-old woman experienced sudden onset of loss of consciousness and her Glasgow Coma Scale (GCS) was 5 points (E1V1M3) on admission. CT scan demonstrated intraventricular hemorrhage and acute hydrocephalus. Angiography did not demonstrate any vascular abnormality. Ventricular drainage was performed for acute hydrocephalus and the postoperative course was good. CT showed a hyperdense lesion in the left trigone, which was contrast-enhanced on T1-weighted MR. Removal of CM was performed via the left middle temporal sulcus. We conducted a Pub Med search for trigonal CM and found 17 cases. Herein we discuss the symptoms, CT and MR findings and treatment. J. Med. Invest. 59: 275-279, August, 2012.
    The Journal of Medical Investigation 01/2012; 59(3-4):275-9. DOI:10.2152/jmi.59.275
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    ABSTRACT: A 62-year-old man with hypertension and diabetes mellitus controlled by medication suddenly noticed slight hemiparesis and was admitted to our hospital. Tissue-plasminogen activator (t-PA) was administered as his NIHSS was 6 and there were no contraindications. His symptoms completely resolved after t-PA injection. He was discharged on Day 9 without neurological deficits despite minor bleeding being detected in a small, low-density area in the right post-central region on CT. However, the hemiparesis gradually recurred subsequently and the low-density area had increased. He was readmitted on Day 38 due to deterioration of symptoms and enhanced CT imaging exhibited a large, low-density area in the central parasagittal region with enhancement was seen. An open biopsy was performed on Day 52 for diagnostic purposes. Histology demonstrated increased small vessels surrounded by many non-specific inflammatory cells and abundant reactive astrocytes. To date, reports of prolonged cerebral edema lasting more than 1 month after cerebral infarction are rare. This condition may be due to angiogenesis induced by t-PA. Another reason may have been the location, i.e., the parasagittal region, which is the most common area for severe cerebral edema after gamma knife surgery.
    Brain and nerve = Shinkei kenkyū no shinpo 01/2012; 64(1):79-84.
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    ABSTRACT: A 63-year-old man presented with an extremely rare variant of persistent primitive hypoglossal artery (PHA), which was found incidentally during examination for a contralateral asymptomatic internal carotid artery (ICA) stenosis. This anastomotic vessel arose from the external carotid artery, not the ICA, and joined the vertebrobasilar artery through the hypoglossal canal. Persistent PHA is rare and the reported incidence is 0.027-0.26%. Recognition of the existence of this variant vessel and preservation during neuroradiologic intervention or surgery is important to prevent possible ischemic complications.
    Neurologia medico-chirurgica 01/2012; 52(7):513-5. DOI:10.2176/nmc.52.513 · 0.65 Impact Factor
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    ABSTRACT: We report a case of gangliocytoma at a cortical and subcortical area in the right parietal lobe. The patient had a generalized seizure at 11 years of age. The MRI shows an ill-demarcated high intensity area in T2 weighted images including an enhancing tumor of 10 mm in diameter. At first, the tumor was carefully followed up because of its small size and the surgical risk. Three years after the onset, a cyst formed at the area of the brain edema adjacent to the tumor. The cyst gradually grew to 21 mm in diameter, the edema had disappeared, and the size of the tumor became smaller (7 mm) within the next 3 years. A mural nodule, jelly-like tumor with calcification was totally removed and diagnosed as gangliocytoma. The cyst fluid was watery-clear, its wall did not contain any tumor. This is the first report of a six-year follow-up of cyst formation of gangliocytoma supporting the concept that edema is a precursor to central nervous system peritumoral cyst formation based on the similar observation of hemangioblastomas.
    No shinkei geka. Neurological surgery 01/2010; 38(1):61-6. · 0.13 Impact Factor
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    ABSTRACT: This study evaluated the clinical and angiographic outcome of large aneurysms treated with coil embolization at an acute stage in patients with poor-grade subarachnoid hemorrhage (SAH). Between July 1, 2001 and June 30, 2004, eight consecutive WFNS grade 5 patients with large aneurysms (15~23 mm) were treated with endovascular coil embolization within two days and followed for at least 30 months. There were three middle cerebral and five internal carotid artery aneurysms. No patients were treated by craniotomy and none survived without treatment. Two patients died of primary brain damage or cerebral vasospasm within one month. One patient died of pneumonia at 24 months. Four patients were alive with good recovery or moderate disability at the time of final follow-up (30~66 months). Angiography immediately after the procedure showed complete occlusion in three, neck remnant in four, and body filling in one patient. No complication was seen related to the procedure. Three aneurysms that were initially neck remnant developed body filling due to coil compaction. Two were re-treated with coils at six and 12 months and resulted in neck remnant. One patient refused re-treatment and died of re-bleeding. Endovascular coil embolization can be selected at an acute stage for the treatment of aneurysms in patients with poor-grade SAH without intraparenchymal hematoma even if the aneur-ysm is large. Serial follow up by MRA/angiography is necessary for at least 12 months.
    Interventional Neuroradiology 03/2009; 15(1):45-51. · 0.73 Impact Factor