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Biomedical subjects

Y Amamoto

Publications and source records attributed to Y Amamoto.

14 recordsLinked to original sources

Five-year clinical course of aortic regurgitation without coronary aneurysm following Kawasaki disease.

Kawasaki disease has recently been considered as a major cause of acquired valvular diseases in infants and children. But there have been few reports on the clinical course of the lesions caused by this disease, particularly aortic regurgitation. In February 1982, we examined a six-month-old male infant who had Sellers third degree aortic regurgitation (AR) and Sellers first degree mitral regurgitation (MR) without discernible dilatation, aneurysm formation or stenosis of the coronary arteries, and in January 1987 we performed a second cardiac catheterization in order to estimate the progress of these lesions. The results were: 1) His AR showed no apparent worsening; 2) His MR had completely recovered; 3) His volume and pressure studies were almost normal. The catheterization data were compatible with those of other clinical examinations. He no longer had cardiac enlargement as seen on a chest roentgenogram, and there were no signs of left ventricular hypertrophy on an electrocardiogram (ECG).

Aortic Valve Insufficiency

Congenital internal mammary artery-to-pulmonary artery fistulas: a case report.

A case of congenital internal mammary artery-to-pulmonary artery fistulas is reported. The patient was a 7-year-old boy in whom this condition was suspected from an abnormal shadow in the left upper lung field upon chest X-ray examination and continuous murmur. A definite diagnosis was made by selective angiography of the internal mammary artery. This condition is extremely rare. Our patient is the youngest among the 16 cases which have been reported so far in the English literature. Surgical treatment may be indicated because there is a risk of rupture of the fistula, endarteritis, and congestive heart failure.

Angiography

[Effective radiation therapy of two cases of primary Ewing's sarcoma of the rib].

Two cases of primary Ewing's sarcoma of the rib are reported, in which radiation therapy was quite effective. Case 1 was an 18-year-old female who had had an operation and radiation therapy for Ewing's sarcoma of the left 7th rib. She was referred to our hospital after a recurrent tumor was found. Radiation therapy (tumor dose 46.2 Gy) and chemotherapy were given. The tumor disappeared and there has been no relapse for 1 year and 3 months after the treatment. Case 2 was a 2-year-old-infant. Radiation therapy (tumor dose 74 Gy) was given for primary Ewing's sarcoma of the left 6th rib. The tumor became small and was successfully removed at operation. There has been no relapse or distant metastasis for 8 months following the operation. We emphasize the importance of multidisciplinary treatment in case 1 and the usefulness of preoperative radiotherapy in case 2.

Adolescent

Mesenteric varices demonstrated by transhepatic portography.

A case of mesenteric varices draining into the left renal vein is reported. The varices were well demonstrated by percutaneous transhepatic portography and were obliterated. This disease entity should be considered in the differential diagnosis of patients with lower gastrointestinal tract hemorrhage and portal hypertension.

Adult

Membranous obstruction of the inferior vena cava associated with intrahepatic portosystemic shunt.

Two cases of membranous obstruction of the IVC at hepatic portion associated with intrahepatic portosystemic shunts, which presumably represent the persistent vitelline sinusoids, are presented. The association of these two conditions has not been previously reported and may support the congenital etiology of the membranous obstruction of the IVC. The caval membrane was successfully dilated percutaneously with a balloon catheter in each case.

Budd-Chiari Syndrome

Spontaneous resolution of bilateral renal artery dissection: a case report.

We report a case of simultaneous bilateral dissection of the renal arteries with partial renal infarction. Of interest is the fact that the dissection resolved spontaneously during the 1-year followup. The radiology, including angiography, computerized tomography and ultrasonography, findings are described. The etiology and treatment of isolated dissection of the renal artery also are discussed.

Adult

Computed tomography of multicystic kidney.

A case of multicystic kidney diagnosed by computed tomography (CT) and confirmed at surgery is presented. On CT, the lesion appeared as an abnormal mass composed of numerous walled, low density areas of varying sizes consistent with the surgical finding of congenital multicystic kidney.

Female

Right-sided cervical aortic arch associated with tetralogy of Fallot and peculiar tortuosity of the descending aorta.

A right-sided cervical aortic arch, tetralogy of Fallot, and a peculiar tortuosity of the descending aorta in which the aorta formed triple loops were diagnosed by angiocardiography in a 12-year-old girl. Histologic examination of the biopsied wall of the left subclavian artery, taken at the time of a Blalock-Taussig anastomosis, revealed no elastic-tissue defect.

Angiocardiography

Therapeutic ethanol injection of hepatocellular carcinomas undetectable by angiography and Lipiodol computed tomography.

Seven smaller than 2 cm in diameter hepatocellular carcinomas (HCC) undetectable by hepatic arteriography and computed tomography (CT) after intraarterial injection of iodized oil (Lipiodol CT) were diagnosed by ultrasonography-guided fine-needle biopsy in 6 patients. All lesions were treated by percutaneous ethanol injection (PEI) in 1-3 weekly intervals. No recurrences have been demonstrated after 7-15 months. The treatment of HCCs undetectable by angiography and Lipiodol CT presents a problem as transcatheter arterial embolization is considered ineffective due to poor vascularity. PEI appears to be an excellent treatment for these small HCCs.

Aged

Multiseptate gallbladder: computed tomographic appearance.

We report a case of multiseptate gallbladder in a 43-year-old female with ultrasonographic and computed tomographic (CT) findings. The postcontrast CT delineated multiple septations with honeycomb appearance in the gallbladder. This finding should raise the suspicion of multiseptate gallbladder.

Adult