Biomedical subjects

Osamu Matsui

Publications and source records attributed to Osamu Matsui.

60 records · Page 4Linked to original sources

PubMedDate not supplied

Spontaneous hemothorax in neurofibromatosis treated with percutaneous embolization.

We evaluated the effectiveness of transcatheter arterial coil embolization therapy for the treatment of spontaneous hemothorax followed by aneurysm rupture in neurofibromatosis patients. Three patients were treated for massive hemothorax caused by arterial lesions associated with neurofibromatosis. Bleeding episodes were secondary to ascending cervical artery aneurysm and dissection of vertebral artery in 1 patient, and intercostal artery aneurysm with or without arteriovenous fistula in 2 patients. Patients were treated by transarterial coil embolization combined with chest drainage. In 1 patient, the ruptured ascending cervical artery aneurysm was well embolized but, shortly after the embolization, fatal hemorrhage induced by dissection of the vertebral artery occurred and the patient died. In the other 2 patients, the ruptured intercostal artery aneurysm was well embolized and they were successfully treated and discharged. Transcatheter arterial coil embolization therapy is an effective method for the treatment of spontaneous hemothorax followed by aneurysm rupture in neurofibromatosis patients.

Adult↗

PubMedDate not supplied

Peritumoral rim enhancement of liver metastasis: hemodynamics observed on single-level dynamic CT during hepatic arteriography and histopathologic correlation.

PURPOSE: The purpose of this work was to clarify the mechanism of peritumoral rim enhancement of metastatic liver cancer. METHOD: Twenty-nine liver metastases of colon cancer were examined by single-level dynamic CT during hepatic arteriography, which was performed without table feed. We analyzed these findings and correlated them with the histopathologic findings. RESULTS: Eleven metastases were hypervascular and 18 were hypovascular. Early appearance of rim enhancement was seen in 3 of 10 hypervascular metastases and 17 of 18 hypovascular metastases (p < 0.01). The time of appearance and thickness of peritumoral rim enhancement showed no apparent correlation with the desmoplastic reaction or inflammation in the surrounding hepatic parenchyma. CONCLUSION: Two types of intra- and peritumoral enhancement were observed. Peritumoral rim enhancement was considered to be due mainly to the drainage of blood flow from the tumor to the surrounding hepatic parenchyma in hypervascular metastasis or increased arterioportal shunts surrounding the tumor in hypovascular metastasis.

Angiography↗

PubMedDate not supplied

Unilateral stent implantation for renal function in bilateral atherosclerotic renovascular hypertension--a case report.

Renal artery stenting improves or preserves renal function in patients with bilateral renovascular disease and chronic renal insufficiency. An 80-year-old male was admitted to the hospital for elevated blood pressure accompanied by congestive heart failure. He had renal insufficiency and severe hypertension secondary to bilateral atherosclerotic renal artery stenosis. Unilateral renal artery stenting in the left kidney resulted in the recovery of renal function, whereas renal artery stenting in the right kidney was technically difficult due to a tortuous aorta. After the left unilateral stent implantation, the serum creatinine concentration decreased from 2.0 to 1.3 mg/dL, and control of his blood pressure required fewer antihypertensive drugs, namely a calcium antagonist, an angiotensin-converting enzyme inhibitor, and diuretics. Fifteen months after stenting, renal scintigraphy demonstrated improved function of the right kidney, despite severe renal artery stenosis, as well as improved function of the left kidney. Renal angioplasty or stenting should be attempted in bilateral atherosclerotic renovascular hypertension with renal insufficiency, even though it may only be successful unilaterally.

Aged↗

PubMedDate not supplied

An experimental study of a new pull-through technique for aortic arch aneurysm in a porcine model.

A new pull-through technique for placement of the aortic arch stent-graft was developed. Self-expandable curved stents (Matsui-Kitamura stents) were used on 4 pigs. With use of the endoscopic system, the sheath insertion was performed at the ascending aorta. By this pull-through method from the ascending aorta to the femoral artery, the stent was deployed into the aortic arch. All stents were successfully deployed into the correct position, and they fitted into the curvature of the aortic arch wall. By this method, stent-grafting for aortic arch aneurysm is expected to be performed with more accuracy and safety.

Animals↗

PubMedDate not supplied

Cisternal segment of the normal abducent nerve: MR imaging with 3D fast asymmetric spin echo sequence.

PURPOSE: The aim of this study was to reveal the techniques and findings of the 3D fast asymmetric spin echo (3D FASE) sequence for imaging the cisternal segment of the normal abducent nerve. METHODS: Ten healthy volunteers were examined using the 3D FASE sequence, and oblique coronal and oblique sagittal images were reconstructed according to the specific course of the abducent nerve. RESULTS: The abducent nerve was identified with certainty and displayed on the oblique coronal and oblique sagittal reconstructed images in 80% of cases using Dorello's canal as landmark. The bilateral nerve of one case and unilateral nerve of two cases could not be identified and displayed. The mean diameter of the cisternal segment was 1.39 mm on 3D FASE image. CONCLUSIONS: The 3D FASE sequence can be used to image the cisternal segment of the abducent nerve with Dorello's canal as a landmark.

Abducens Nerve↗

PubMedDate not supplied

Prevention of hepatic infarction as acute-phase complication of TIPS by temporary balloon occlusion in a patient with primary myelofibrosis.

Severe acute liver dysfunction occurred following transjugular intrahepatic portosystemic shunt (TIPS) creation in a patient with massive ascites due to portal hypertension associated with primary myelofibrosis. On US and TIPS venography, we considered that the acute liver ischemia was induced by TIPS. To avoid diffuse hepatic infarction and irreversible liver damage, a balloon catheter was inserted transjugularly into the TIPS tract and occluded it to increase portal venous flow toward the peripheral liver parenchyma. The laboratory data indicating hepatic dysfunction were improved after the procedure. We should pay attention to the possible occurrence of acute hepatic ischemia and infarction after TIPS creation even in a case of noncirrhotic portal hypertension. In such cases, temporary balloon occlusion of TIPS is an effective therapeutic method, probably as a result of inducing the development of arterial compensation through the peribiliary plexus.

Acute-Phase Reaction↗