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Biomedical subjects

Hidemasa Takao

Publications and source records attributed to Hidemasa Takao.

14 recordsLinked to original sources
PubMed2004

Gastrointestinal stromal tumor of the retroperitoneum: CT and MR findings.

Gastrointestinal stromal tumor (GIST) is a non-epithelial neoplasm arising from the wall of the gastrointestinal (GI) tract. Although the majority of GISTs are located in the GI tract, some GISTs occur in the omentum, mesentery and retroperitoneum. GIST arising in the retroperitoneum is extremely rare, and its radiological findings have not been well described. We report a case of primary retroperitoneal GIST and discuss its imaging findings.

Aged↗
PubMed2003

Central neurocytoma with craniospinal dissemination.

Central neurocytoma was first described by Hassoun et al. in 1982. The tumor is a rare benign tumor of the central nervous system, usually located in the lateral ventricles. Most reported cases are histologically and clinically benign. Several cases with recurrence have been described. Including the case presented here, only seven cases with craniospinal dissemination have been reported. None of the previous cases with dissemination had histological atypia but most did have a high MIB-1 labeling index (MIB-1 LI). Our patient had a high MIB-1 LI (4.6%) and dissemination was found to have advanced through the anterior horns of the lateral ventricles and to the spinal cord at the T4 level. The patient underwent partial resection of the tumor with follow-up radiation treatments for the residual tumor and dissemination. After the radiation, the size of the tumor decreased. The report of this casewill be helpful in the treatment of disseminated central neurocytoma.

Adult↗
PubMedDate not supplied

Coil embolization of an arteriobiliary fistula caused by hepatic intra-arterial chemotherapy.

Arteriobiliary fistula is a rare complication of hepatic intra-arterial chemotherapy. We report successful coil embolization of an arteriobiliary fistula. An 80-year-old woman underwent percutaneous placement of an indwelling catheter into the replaced right hepatic artery for intra-arterial chemotherapy of liver metastases. Coil embolization of the left hepatic artery was not performed. The patient complained of abdominal pain during intra-arterial chemotherapy. Angiography revealed a fistula between the replaced right hepatic artery and the common bile duct. The fistula was successfully treated by coil embolization via the indwelling catheter, and the indwelling catheter was removed. Although such complications usually herald the termination of intra-arterial chemotherapy, the patient underwent percutaneous implantation of a new catheter-port system, and intra-arterial chemotherapy was restarted.

Abdominal Pain↗
PubMedDate not supplied

Ectopic thyroid in the adrenal gland: Computed tomography findings.

Ectopic thyroid in the adrenal gland is extremely rare, and its radiologic findings have not been reported in the radiologic literature. A case of ectopic thyroid in the adrenal gland is reported, and its imaging findings on computed tomography are discussed.

Adrenal Gland Diseases↗
PubMedDate not supplied

Temporal subtraction of thin-section thoracic computed tomography based on a 3-dimensional nonlinear geometric warping technique.

The authors developed a computer system that automatically produces temporal subtraction images on thin-section thoracic computed tomography based on a 3-dimensional nonlinear geometric warping technique. The automated subtraction system was applied to data from 20 subjects with lung diseases. Nineteen (95%) of 20 results showed good or excellent image quality. The remaining 1 (5%) showed adequate image quality. Our preliminary computer system demonstrates the potential for a clinically useful automated subtraction system.

Humans↗
PubMedDate not supplied

Diffusion-weighted magnetic resonance imaging in pituitary abscess.

Pituitary abscess is a rare but potentially life-threatening disease. The correct preoperative diagnosis of pituitary abscess is difficult and rarely made. We present a case of pituitary abscess where diffusion-weighted magnetic resonance imaging was useful in making the preoperative diagnosis of pituitary abscess.

Adult↗
PubMedDate not supplied

Cerebral lipiodol embolism after transcatheter arterial chemoembolization of hepatocellular carcinoma.

A case of cerebral lipiodol embolism after transcatheter arterial chemoembolization (TACE) of hepatocellular carcinoma is presented. A 76-year-old man underwent TACE for advanced hepatocellular carcinoma. Immediately after chemoembolization, his level of consciousness deteriorated. Computed tomography revealed deposition of iodized oil in the cerebral cortex, basal ganglia, and thalami. Magnetic resonance imaging showed restricted diffusion within the thalami and basal ganglia. The patient's level of consciousness gradually improved, and all neurologic symptoms disappeared over 6 weeks.

Aged↗
PubMedDate not supplied

Serial diffusion-weighted magnetic resonance imaging in methanol intoxication.

We report the serial magnetic resonance imaging (MRI) findings in a case of methanol intoxication. A 50-year-old man who had accidentally ingested methanol was admitted to our institution. The patient was almost blind, and became comatose. The MRI showed bilateral putaminal lesions with restricted diffusion. The MRI, which was performed on the third day after admission, showed new lesions in the subcortical white matter. The patient's general condition improved. His visual acuity, however, did not improve.

Blindness↗