Biomedical subjects
Publications and source records attributed to K Imanaka.
We report on an adult case of preduodenal portal vein illustrated by computed tomography (CT) and angiography. These diagnostic modalities were initially performed to evaluate a coexisting pancreatic cancer. Contrast-enhanced CT demonstrated unusual positioning of the portal vein ventral to the duodenum. The superior mesenteric-portal vein, which was L-shaped and convexly caudad, strongly suggested this anomalous condition.
We examined the modulation of somatosensory evoked potentials (SEPs) during upper arm compression and following voluntary movement during upper arm compression. Most SEPs were significantly decreased, although some SEPs showed a slight, non-significant diminution. SEPs are mediated not only by myelinated fibers but also by mixed nerves and afferents from cutaneous, joints, and deep tissues, these being dependent upon the dorsal column-medical lemniscal system. Therefore, most of the diminution in SEPs found here may have been due to afferent occlusion from muscle, cutaneous, joints, and deep tissues, since normal SEPs are selectively modulated, corresponding to motor or mental tasks, regardless of whether gating is centrifugal or centripetal. In addition, the present experiments showed that all the SEPs at FZ, C3' and CZ were significantly decreased following voluntary movement at a pressure 25%-30% higher than the subject's systolic blood pressure. Comparing SEPs during upper arm compression and those following voluntary movement during upper arm compression at these pressures, we found that the SEPs at C3' were significantly diminished following voluntary movement during upper arm compression, with other SEPs showing slight, non-significant attenuation. In conclusion, it is possible that the diminution in SEPs following voluntary movement could be responsible for sensory inputs, however, when sensory inputs are present, centrifugal modulation would also be responsible for this diminution.
We report a case of 64-year-old man with chronic hemorrhagic empyema. T1- and T2-weighted MR images showed variably hyperintense areas in the tumor that reflected the presence of fresh and old hematoma. Gd-DTPA-enhanced MRI revealed capillary bleeding in the periphery of the mass.
Three patients with recurrence of brain metastases from small cell lung cancer were treated with whole brain reirradiation therapy. A total dose of 20 Gy was administered to two patients with hyperfractionation (20 fractions) and to one with conventional fractionation (10 fractions). Two cases achieved PR and the other NC. Survival after reirradiation was four months for all patients. Two patients died of progressive brain metastases and one patient of liver metastases. No radiation injury was observed during follow-up. Whole brain reirradiation at a dose of 20 Gy in 10 or 20 fractions was therefore considered useful and safe for brain recurrence of small cell lung cancer.