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Biomedical subjects

O Sato

Publications and source records attributed to O Sato.

At least 217 records · Page 12Linked to original sources
PubMed1984

[Cessation of cerebrospinal fluid rhinorrhea by bromocriptine treatment of a patient with invasive prolactinoma].

As an unusual complication of bromocriptine treatment for prolactinoma, CSF rhinorrhea has been reported in the relevant literature. The authors, on the contrary, experienced cessation of CSF rhinorrhea during bromocriptine treatment. A 37-year-old man with invasive prolactinoma underwent a frontal craniotomy for removal of pituitary adenoma on February 2, 1978. Postoperative CT showed residual adenoma within the sella and the sphenoid sinus. Postoperative irradiation was started on February 27 and given in a total dose of 5,000 rad. On March 30, 1979, the patient noticed clear fluid dropping out of his nostrils, the fluid contained glucose and CSF rhinorrhea was suspected. The CSF rhinorrhea was considered due to the regrowth of adenoma in the paranasal sinuses. On June 27, 1979, the patient developed headache together with fever and CSF rhinorrhea. On examination, the patient was drowsy and showed marked nucheal rigidity. Under the diagnosis of meningitis caused by CSF rhinorrhea antiseptic chemotherapy was started. Hypocycloidal tomogram showed extensive destruction of the sella and a soft density mass in the sphenoid and the ethmoid sinuses. CT also showed intrasphenoidal and lateral extension of the adenoma. To repair of the CSF leak, transsphenoidal surgery was performed on August 2, 1979 when the patient was in favorable condition. The sphenoid sinus was full of adenoma and it was removed, however, the exact location of the CSF leak could not be identified. The sphenoid sinus was packed with muscle tissue. Bromocriptine treatment was postoperatively started with 5 mg per day on August 25, 1979. The patient sustained CSF rhinorrhea which was decreased by lumbar drainage.(ABSTRACT TRUNCATED AT 250 WORDS)

Adenoma↗
PubMed1984

[Diagnosis of pituitary microadenoma by magnification carotid angiography and intercavernous sinus venography].

Carotid angiography was performed on 12 cases of pituitary microadenomas at 2.3 X magnified frontal projection and 3.0 X magnified lateral projection. Magnification carotid angiograms were analyzed to determine the pathologic findings in 12 cases on 23 sides. Carotid angiograms demonstrated compressed posterior pituitary gland in 3 of 12 cases and 4 of 23 sides which resulted from the expansion of pituitary microadenomas. But carotid angiogram failed to demonstrate any evidence of tumor stain, abnormal capsular arteries or hypertrophied inferior hypophyseal arteries. These results suggested that magnification carotid angiography was not a useful diagnostic procedure for the detection of pituitary microadenomas. Intercavernous sinus venography was performed on 12 cases of pituitary microadenomas. The technique consisted in catheterization into the inferior petrosal sinus after puncture of the femoral vein. Injection of 10 ml. of contrast medium into the inferior petrosal sinus at a rate of 5 ml. per second. The base projection is most demonstrable and routinely used. Intercavernous sinus venography identified the presence of microadenoma in 10 of 12 cases and false negative in two cases. Nine of 12 cases demonstrated narrowing, interruption and disappearance of the anterior and inferior intercavernous sinuses. Only 3 of 12 cases demonstrated narrowing of the posterior intercavernous sinus and nine cases demonstrated compression signs of the venous strips of the cavernous sinus.(ABSTRACT TRUNCATED AT 250 WORDS)

Adenoma↗
PubMed1984

[Renovascular hypertension with a solitary kidney associated with retrocaval ureter: a case report].

A case of renovascular hypertension in a patient with a congenitally solitary kidney associated with retrocaval ureter is reported. Aortorenal bypass with autogenous saphenous vein graft and concomitant mobilization of the ureter by division and reanastomosis of the inferior vena cava were performed. Pathogenesis of the stenotic lesion of the renal artery was fibromuscular dysplasia. Postoperative improvement of hypertension was not so good as expected. Soon after administration of nifedipine (20mg/day) was started, blood pressure decreased down to 130/80mmHg and had been well controlled. Problems regarding renovascular hypertension with a solitary kidney and surgical treatment of retrocaval ureter are discussed.

Adult↗
PubMed1984

[Isolated iliac aneurysms].

An isolated iliac aneurysm is an uncommon entity with a relative incidence to abdominal aortic aneurysm of 0.9 to 1.9 percent. Analysis of 16 cases with 20 isolated iliac aneurysms experienced at our vascular service makes the basis of this report. Seventeen aneurysms involved the common iliac artery, two the internal iliac artery and one the external iliac artery. As we experienced 341 abdominal aortic aneurysms during the same period, relative incidence of isolated iliac aneurysm to abdominal aortic aneurysm was 4.7 percent. Fifteen of the 16 cases were male; isolated iliac aneurysms had significantly higher preponderance for the male. Six of the cases were presented with ruptured aneurysms, giving a rupture rate of 37.5 percent. This rupture rate was significantly higher than that of abdominal aortic aneurysms of 11.1 percent. Operation was performed on 15 patients; the remaining one died before surgery. Although there was no operative death among the elective cases, three patients in the ruptured group died postoperatively giving a mortality rate of 60 percent. The least diameter of the ruptured aneurysms was 3.5 centimeter. Among the 16 patients 5 presented with a ruptured aneurysm and 3 had no symptoms related to the aneurysm. Five patients complained of a pulsatile abdominal mass. Two of the ruptured aneurysms were associated with an iliac arteriovenous fistula. Both of them involved the common iliac artery. Although emergency operation was performed on one of them, he died of acute renal failure due to preoperative dehydration and hypovolemia. The another one was operated on electively after intensive medical treatment for heart failure and the patient survived.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed1984

Peripheral aneurysms of the posterior inferior cerebellar artery.

Nonmycotic peripheral posterior inferior cerebellar artery (PICA) aneurysms are rare. The authors report six cases of peripheral PICA aneurysm. Two of these are unusual; one was fusiform and another was a double aneurysm arising from the peripheral PICA. The previously reported 40 cases of peripheral PICA aneurysm are reviewed.

Adult↗
PubMed1983

Successful removal of pontine haematoma due to rupture of cryptic arteriovenous malformation. Case report.

One case of a pontine haematoma with clinical symptoms of cerebellopontine angle tumour is described. The haematoma was successfully evacuated, and preoperative neurological deficits disappeared except for minimal right fifth nerve palsy. The pathological specimen was diagnosed as arteriovenous malformation. Lateropontine haematomas must be included in the differential diagnosis of cerebellopontine angle tumours.

Cerebellar Neoplasms↗
PubMed1983

[Hypothalamic histiocytosis X--report of a case].

Histiocytosis X is a non-neoplastic disorder of unknown etiology characterized by a mass of proliferating histocytes, plasma cells and inflammatory cells forming a granuloma within the reticuloendothelial elements of any organ system in the body. The three clinical syndromes of this condition, eosinophilic granuloma, Hand-Schüller-Christian disease and Letterer-Siwe disease were unified into a single nosological entity by Lichtenstein in 1953. The complication of the central nervous system is shown in the cerebrum, cerebellum, sella turcica, hypothalamus and so on. Hypothalamic histiocytosis X is often found in cases of disseminated histiocytosis X, but an isolated histiocytosis X of the hypothalamus is very rare. Including our case, 16 cases of hypothalamic histiocytosis X were reviewed in this paper. Age at onset was older than disseminated histiocytosis X. The sex ratio was almost equal. Diabetes insipidus was equally found as in other suprasellar masses and it was important as an initial symptom. The CT finding was shown as a homogeneously enhanced mass but no specific finding of CT was seen as suprasellar histiocytosis X. Therefore, differential diagnosis was very difficult. Treatments for this disease were variable. Chemotherapy, irradiation or combination of both were reported. The combination therapy was thought to be the most effective treatment. The relation between this disease and disseminated histiocytosis X is not known. But possibility of transformation of this disease into disseminated histiocytosis X was reported in some papers. Therefore, early diagnosis by biopsy of the hypothalamic lesion was stressed.

Adult↗
PubMed1983

[Investigation of tin and chromium grain boundary diffusion in iron by microautoradiography].

Microautoradiography using conversion electron and Auger electron of the isotopes 119mSn and 51Cr which were diffused from the surface in pure iron was investigated. The surface layers were removed successively by chemical reagents to prepare the specimen for microautoradiographs. The density of silver particles was measured in the boundary region and was normalized by comparing with the density near the triple point of the grain boundary. Differences of the diffusion coefficients in the grain boundary were investigated from the frequency diagram of the isotope concentrations near the boundary in individual specimens.

Autoradiography↗