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Biomedical subjects

G Uchiyama

Publications and source records attributed to G Uchiyama.

102 records · Page 6Linked to original sources
PubMedDate not supplied

Adrenal tissue characterization with 0.5-T MR imaging: value of T2*-weighted images.

The authors investigated the value of magnetic resonance (MR) imaging at 0.5 T for distinguishing adrenal adenomas from adrenal metastases. The series included 23 adrenal adenomas (18 nonhyperfunctioning, five hyperfunctioning) and 23 adrenal metastases from various organs. Adrenal tumor-liver signal intensity ratios on T1-, T2-, and T2*-weighted images were calculated for adrenal tissue characterization. Adrenal adenomas were more precisely distinguished from adrenal metastases on T2*-weighted images (21 of 23, 91%) than on T2-weighted images (15 of 23, 65%). T1-weighted images were not useful for this distinction. In conclusion, T2*-weighted images were better than routine T2-weighted images for distinguishing adrenal adenomas from adrenal metastases. It can be postulated that the total signal intensity of adrenal adenomas, which contain some fat components, decreased on T2*-weighted images because of an out-of-phase effect.

Adenoma↗
PubMedDate not supplied

Diffuse arteriovenous malformation involving jejunum and total colon with mesenteric varices. Case report.

Diffuse intestinal arteriovenous malformation (AVM) is very rare. We describe a case of diffuse AVM involving the jejunum and the total colon in an adult. In addition, mesenteric varices without portal hypertension is demonstrated on angiography of the superior mesenteric artery. The high flow through the AVMs may be a major component in the etiology of the mesenteric varices in our case.

Aged↗
PubMedDate not supplied

Exophytic regenerating nodule of the liver: misleading appearance on iodized-oil CT.

Iodized-oil CT in a patient with chronic liver disease revealed focal accumulation of iodized oil in an exophytic mass. Single photon emission CT (SPECT) with [99mTc]phytate showed the existence of functioning Kupffer cells, excluding hepatocellular carcinoma. Biopsy revealed a regenerating nodule. Positive iodized-oil CT does not always indicate hepatoma. In such cases, SPECT with [99mTc]phytate will help to make a correct diagnosis.

Aged↗
PubMedDate not supplied

Dense parenchymal accumulation of Lipiodol after transarterial chemoembolization.

Dense accumulation of Lipiodol in hepatic segmental parenchyma was studied by computed tomography (CT) after transarterial chemoembolization (TACE) for hepatic tumor. Six patients showed dense accumulation of Lipiodol in hepatic segmental parenchyma on CT two weeks after TACE. Four of the six showed parenchymal accumulation of Lipiodol as dense as that in a tumor at three weeks after TACE. Therefore, it was considered that evaluation with CT should be performed after one month or more in order to differentiate between Lipiodol accumulation in tumors and that in non-neoplastic liver parenchyma.

Carcinoma, Hepatocellular↗
PubMedDate not supplied

Multilocular cystic hemangioma: CT and MR appearance.

An atypical case of multilocular cystic hemangioma is presented. A 4.5 cm multilocular cystic mass was incidentally found in a 66-year-old healthy woman on ultrasound screening. CT, MR imaging, and angiography were performed: however, the features that are characteristic of cavernous hemangioma were not obtained. The final diagnosis could not be made until surgery.

Aged↗
PubMedDate not supplied

Hypertrophic pulmonary osteoarthropathy inactivated by antitumor chemotherapy.

A case of hypertrophic pulmonary osteoarthropathy (HPO) associated with carcinoma of the lung is reported. HPO in this patient was documented by Tc-99m methylene diphosphonate scans over a period of seven months. He was treated solely by antitumor chemotherapy, and his HPO was inactivated in three months. Whereas most reports refer to surgery, vagotomy, or radiotherapy for the treatment of lung carcinoma, this case demonstrates the effect of palliative chemotherapy in inactivating HPO in a rather short period of time.

Bone and Bones↗
PubMedDate not supplied

A study of chondroitin sulfate iron colloid as a liver specific MR contrast agent.

Chondroitin sulfate iron colloid (CSIC) is a therapeutic agent for iron deficiency anemia. The potential of CSIC to decrease liver signal intensity at magnetic resonance (MR) imaging has already been tested. Enhanced detection of liver carcinoma by CSIC at MR imaging was studied in vivo. Our purpose was to determine the time period required to obtain the maximum contrast enhancement from CSIC at different dose levels. We performed MR imaging of eight rats with hepatic carcinoma before and after CSIC administration. For all dose groups it was found that on T2-weighted images the maximum contrast to noise ratio (C/N) was at 4-8 hours after the drug administration, while on proton density-weighted images the maximum C/N was at 2-8 hours.

Adenocarcinoma↗
PubMedDate not supplied

A case of intracranial involvement of Hodgkin's disease.

We report a rare case of Hodgkin's disease in which intracranial involvement developed during the course of the patients illness. A 20-year-old man who had complained of lymph node swelling on the right neck was admitted to a hospital in December 1978. Lymph node biopsy revealed Hodgkin's disease, and he was treated by various series of chemotherapy and radiotherapy with unsatisfactory results. He was transferred to Yamanashi Medical College Hospital in June 1985. He was in a far-advanced state at the time, and palliative treatment was applied. In the middle of May 1986, he complained of headache, tinnitus, and sleeplessness. Vomiting and tremor were observed by the end of May 1986. Brain CT scan revealed a space occupying lesion in the right temporal region. Whole brain irradiation of 45 Gy was effective, and the lesion disappeared. However, his general condition deteriorated and he died in November 1986. Brain autopsy could not be performed.

Adult↗
PubMedDate not supplied

Decreased signal intensity of cerebral cortex on T2-weighted MR images.

To define the frequency of decreased signal intensity (DSI) in cerebral cortex on T2-weighted images relative to aging and to the incidence of identifying white matter pathology, T2-weighted MR brain images of 906 patients consecutively examined between July 1989 and June 1991 were reviewed. MR images of cerebral cortex were divided into five areas: frontal lobe (F), pre- and postcentral gyri (C), parietal lobe (P), occipital lobe (O) and temporal lobe (T). Each area was separately and independently evaluated for the presence or absence of DSI. The frequency of DSI in each area was plotted against patients' ages. The severity of leukoaraiosis was evaluated in relation with DSI in each cortical area. Patients with DSI in area F numbered 61 (5.7%), in area C 236 (26.0%), in area P 174 (15.9%), in area O 428 (47.2%), and in area T 10 (1.1%). The number of patients with DSI in each area increased with age. The greater the severity of leukoaraiosis, the greater the chance of finding DSI of the cerebral cortex. The incidence of DSI in the cerebral cortex increased with the patient's age as well as with the severity of co-existent white matter pathology.

Adolescent↗