破裂巨大腎動脈瘤の1例

64歳女, 下腹部不快, 失神発作にて発症したエコー, CTにて腎動脈瘤の破裂を強く疑い, 血管造影にて確診した。この際コイルによる塞栓を試みたが不能で, 腎摘出を行い救命しえたWe report a case of rupture of giant renal artery aneurysm (10 cm diameter) with lower abdominal discomfort and a syncopal attack. The patient was successfully treated by nephrectomy. Rupture of a giant renal artery aneurysm is lethal in most cases and prompt diagnosis is indispensable. As preoperative diagnosis, ultrasonography was useful as it showed the blood flow in the renal artery aneurysm in real-time. CT scan was also useful in determining accurately the size of the aneurysm and extension of hematoma in its surroundings

Self-potential studies in volcanic areas(5) : Rishiri, Kusatsu-Shirane, and White Island

We performed self-potential (SP) profiling or mapping in three volcanic fields, Rishiri (northern Hokkaido), Kusatsu-Shirane (central Honshu) and White Island (northern New Zealand). The SP profile on the western flank of Rishiri volcano showed a remarkable high in the summit side, which is similar to many other active volcanoes. Assuming a negative ζ-potential, it is likely that Rishiri volcano has a large hydrothermal circulation system, and therefore still has enough thermal energy to maintain this circulation. Kusatsu-Shirane volcano inversely showed a decreasing trend toward the summit. It is a contradictive result to the previous knowledge that a volcano with remarkable hydrothermal system shows negative SP on the top. We suspect that the low pH of ground water in this area makes ζ-potential null or positive, resulting in the reversed surface SP profile to ordinary cases. This idea should be examined by laboratory experiments in the future. In the Main Crater of White Island volcano, we found some small-scale anomalous patches associated with fumaroles and steaming ground. The small variability of SP is probably attributed to the very low resistivity of the ground. 1