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Biomedical subjects

T Hiromura

Publications and source records attributed to T Hiromura.

At least 19 recordsLinked to original sources
PubMed1998

[A method for ordering CT examinations on the Intranet].

We have created a method for ordering CT examinations on the Intranet. Using user-friendly, free software for Web browsers and server applications, this method is easy to operate and inexpensive to install. The database engine, originally developed with Perl (Practical Extraction and Report Language), performed quickly. Equipped with security and access control functions, the method prevents not only illegal access, but also multiple orders placed simultaneously. This method enables personal computer users to order CT examinations quickly and with assurance.

Computer Communication Networks↗
PubMed1996

Simple and rapid production of radiographic slides or prints using a personal computer and a laser imager.

A simplified and rapid method for making radiographic slides or prints using a personal computer, a computer monitor adapter and a laser imager is described. When the divided monitor output of a personal computer is connected to a laser imager in the Radiology Department, radiographs and text on the personal computer can be printed out from the laser imager. By selecting slide size print format, 12 slide-sized images can be printed on a film. In addition, by selecting other print formats various sized images can be printed on film, which then can be used as teaching files or as backlight display panels for scientific exhibits. This method can only produce gray-scale printouts, which are sufficient for radiological presentations. Any radiology department can utilize this system by simply installing a computer monitor adapter.

Audiovisual Aids↗
PubMed1996

[Simplified radiographic slide production utilizing a laser imager and personal computer].

A simple, rapid, inexpensive method for producing radiographic slides is described. By connecting the divided monitor output of a personal computer to a laser imager in the Radiology Department, radiographics and text displayed on the personal computer could be printed out from the laser imager. By selecting a print format of slide size, 12 slide-sized images could be printed on film. In addition, by selecting other print formats, various sized hard-copy images could be obtained. These print-outs could only be produced in black and white, but were convenient for radiology conferences and teaching files.

Humans↗
PubMed1996

[Renal lobar dysmorphism: dynamic CT or helical CT diagnosis].

Renal lobar dysmorphism (RLD), a developmental malposition of a renal lobe, contains both cortical and pyramidal structures. Of our ten cases, two were found as peripelvic masses on US, and one on MRI and angiography. The others were found incidentally within an eight-month period on abdominal helical CT performed for the detection of other diseases. These ten cases were correctly diagnosed on dynamic CT or helical CT because they clearly showed the typical cortical and pyramidal structures of RLD. In the corticomedullary phase of CT, the oval-shaped cortex of the RLD was demonstrated in the perihilar medulla of the kidney. The nephrographic phase revealed accumulation of contrast medium within the pyramid of the RLD. The so-called "junctional parenchyma" which was discussed recently was not confirmed in our cases. RLD has no pathological significance. To avoid unnecessary additional examinations or surgical intervention, it is important to recognize the entity of RLD and its correct diagnosis by dynamic or helical CT.

Adult↗
PubMed1995

Lobar dysmorphism of the kidney.

We report a case of a 38-year-old woman with lobar dysmorphism of the kidney. Lobar dysmorphism is a pathology classified under renal pseudotumor, which has received little attention. It is presumed that these cases will increase in number with advances in imaging diagnosis. Dynamic CT scan is useful for the diagnosis of this disease.

Adult↗
PubMed1994

[Ultrasonography of cystic thyroid nodules: sonographic-pathologic correlation].

Retrospectively the ultrasonographic findings of 153 surgically resected cystic thyroid nodules were reviewed. The pathologic findings in this series revealed that 86% were degenerating benign adenomas or adenomatous goiters, and 14% were malignant tumors. The sonographic appearance of these lesions was classified into 7 groups as follows: type I: entirely cystic (less than 1cm), type II: cystic(more than 1cm) [II(a)], and with small polyp or dome-like elevation on the cyst wall [II(b)], type III: larger cyst with projection (more than 1cm) into the lumen, type IV: cyst with a peripherally localized solid component, type V: irregularly mixed cystic and solid components, type VI: a solid mass with multiple crescentic cysts [VI(a)], or round cysts [VI(b)], type VII: a solid mass with only one or two cysts. Pathologic correlation revealed that malignancy in this series ranged from 80% in type III and V to only 4% in type II, where most of the lesions in this group were composed of granulation tissue in degenerating adenomatous polyps and cyst walls. Lesions in type IV showed malignancy rate of 40%. Type III showed characteristic sonographic findings seen in cystic papillary carcinomas (CPCs), with multiple punctate echogenic foci in large pedunculated projections. The typical psammomatous calcifications specific in this group were confirmed in 6 of the 8 type III CPCs. The multiple crescentic cysts in type VI(a) lesions were characteristic sonographic signs seen in adenomatous goiters, representing the pathologic finding of cysts forming around each of multiple adenomatous nodules in this group. Type VII represented non specific appearing lesions, included adenomas, adenomatous goiters, CPCs and follicular carcinomas.(ABSTRACT TRUNCATED AT 250 WORDS)

Adenoma↗
PubMed1991

[A case of bronchial artery aneurysm demonstrating a mass shadow on chest X-ray film].

A 66-year-old woman was admitted on May 13, 1989, because of an abnormal round shadow in the right hilum on chest X-ray film. Bronchoscopy revealed a stenosis of the right B8 caused by a bulging lesion. An aortogram showed a large meandering bronchial artery and a saccular aneurysm. The aneurysm was about 25 mm in diameter and associated with a bronchopulmonary anastomosis. It was surgically removed by right lower lobectomy. Pathological examination proved that the resected lesion was an arterial aneurysm. Patchy arteriosclerotic change was present in the intima of the aneurysm, but there was no evidence of inflammatory change in the arterial wall and the adjacent alveoli and bronchi. Twenty-six cases of bronchial artery aneurysm have been previously reported in the literature, but this is the first case that appeared as a solitary nodule on conventional chest X-ray.

Aneurysm↗
PubMed1990

[Cystic papillary carcinoma of the thyroid--sonographic-pathologic correlation].

Ultrasonographic findings of 13 patients with cystic papillary carcinoma (CPC) of the thyroid gland were reviewed retrospectively correlating with pathologic findings. A 4-6 cm oval cystic structure with a 2-3 cm pedunculated projection of mass into the lumen was the characteristic sonographic findings of CPC. However, other sonographic findings of CPC simulated adenoma, nodular goiter or follicular carcinoma. Pathological investigation revealed that malignant cells tended more to be located in intracystic pedunculated mass and/or pericystic region than in the cyst wall. In most of the cases cyst walls were chiefly composed of granulomatous tissue with scattered malignant cells. These findings indicate that the needle biopsy should be done under ultrasonographic guidance to obtain sufficient material for accurate cytologic and/or pathologic diagnosis, thereby reducing the number of false negative cases.

Adult↗
PubMed1990

[CT in staging gastric cancer].

CT pictures of 26 cases of advanced gastric cancer were reviewed. All the cases of gastric cancer were staged surgically and also histologically. 1) Gastric cancer was enhanced intensely. 2) About the diagnosis of the extension of the tumor, there were many problems to be solved in the future, but the result of final staging was satisfactory. 3) With further advent of technology and methodology in the field of CT, CT will play an important role in staging diagnosis of gastric cancer.

Humans↗
PubMed1989

[Computed tomography of the kidney with diuretics--a method for avoiding artifacts due to nonionic contrast media].

We devised a method for avoiding beam-hardening artifacts, which interfere with enhanced CT images of kidney due to nonionic contrast medium. The radiographic effect and the frequency of beam-hardening artifacts on enhanced CT of kidney were studied by prospective comparison among three groups: a group of 20 patients examined with furosemide (f-d. CT), a group of 20 patients examined without diuretics (non-d. CT) and a group of 20 patients examined after water intake (w-d. CT). In all patients of f-d. CT group, the renal parenchyma from the cortex to the papilla was almost evenly enhanced, free from artifacts. The density of the renal papilla and pelvis in non-d. CT and w-d. CT groups was significantly higher than that in f-d. CT group, and artifacts were also observed in 14 (70%) of non-d. CT group and 12 (60%) of w.d. CT group, respectively. Satisfactory CT of kidney free from artifacts was obtained by f-d. CT, providing easy evaluation of renal pelvic or peripelvic lesions. In conclusion, this technique can be used in those pathologic cases of renal pelvis or peripelvic region, that are not clear on routine CT because of artifacts.

Adult↗
PubMed1989

[Cystic thyroid masses: ultrasonographic and pathologic correlation].

Forty-nine patients with 63 cystic thyroid masses who had undergone preoperative sonography were retrospectively reviewed. 52 lesions (83%) were benign and others (17%) were malignant. Among various sonographic findings of cystic thyroid masses, oval cystic lesions with polyp or dome like solid component projecting into the lumen were all diagnosed adenomatous goiter. Irregular cystic structures with more than 2 cm finger like pedunculated mass extended into and/or out of the lumen were all diagnosed papillary carcinoma. Small oval cysts (less than or equal to 1 cm) with strong echo were all diagnosed colloid goiter. The other sonographic type of cystic thyroid masses had somewhat malignancy (12-30%), not having characteristics which differentiate benign from malignant lesions. Pathologic findings of malignant lesions showed that cancer cells existed rather in pericystic portion than in cyst wall except for finger like solid component projecting into the lumen which was papillary carcinoma itself. Ultrasonically guided needle biopsy should be performed to get samples of above portions.

Adenoma↗
PubMed1989

[Ultrasonography of ganglions in the extremities].

Ultrasonography of 8 cases of cystic mass in extremities (7 ganglions, 1 popliteal cyst) were reviewed and evaluated. The lesions were demonstrated as round, oval or flattened shaped masses with no echo signal. However, in most cases, there was no sign of posterior echo enhancement, which may be the effect of posterior bony structure. It seemed important to handle probe with adequate palpation, which enables examiner to get further anatomical information.

Adult↗
PubMed1989

[A case of essential mesocaval shunt].

Essential mesocaval shunt is very rare entity. A case of chronic cholecystitis with mesocaval shunt from the branch of superior mesenteric vein was reported. This rare hepatofugal pathway was clearly demonstrated by percutaneous transhepatic portography. Selective middle colic venography showed that the branch of this vein was directly connected to the inferior vena cava. After ligation and resection of the shunt, the level of patient's blood ammonia was decreased and the pressure of portal vein was increased. This rare case indicate that the possibility of early diagnosis and interventional radiology for +hepatic encephalopathy.

Aged↗
PubMed1988

[An analysis of needle biopsy under ultrasonography of the thyroid gland].

A multivariate analysis of 47 thyroid nodules and 34 diffuse goiters has been employed to determine the cause of failure in thyroid biopsy under ultrasonography. In the thyroid nodule cases, 30 percent were found to have been misdiagnosed or judged to be an inappropriate sampling. The most important factor leading to failure is a size of tumor. Only one fourth of the small tumors of less than 1 cm were correctly diagnosed and, in cases of a relatively large cystic tumor or a peripherally located nodule, an exact diagnosis was difficult, though 90 percent of the diffuse goiters were difficult, though 90 percent of the diffuse goiters were correctly diagnosed by this method. This result indicates that needle biopsy of the thyroid gland is reliable in cases of a diffuse goiter but problems remain to be resolved in cases of small or cystic tumors and peripherally located nodules.

Adolescent↗