BackgroundTransradial access (TRA) for neurointervention is becoming increasingly popular as experience with the technique grows. Despite reasonable efficacy using femoral catheters off-label, conversion to femoral access occurs in approximately 8.6–10.3% of TRA cases, due to an inability of the catheter to track into the vessel of interest, lack of support, or radial artery spasm.MethodsThis is a multicenter, retrospective case series of patients undergoing neurointerventions using the Rist Radial Access System. We also present our institutional protocol for using the system.Results152 patients were included in the cohort. The most common procedure was flow diversion (28.3%). The smallest radial diameter utilized was 1.9 mm, and 44.1% were performed without an intermediate catheter. A majority of cases (96.1%) were completed successfully; 3 (1.9%) required conversion to a different radial catheter, 2 (1.3%) required conversion to femoral access, and 1 (0.7%) was aborted. There was 1 (0.7%) minor access site complication and 4 (2.6%) neurological complications.ConclusionsThe Rist catheter is a safe and effective tool for a wide range of complex neurointerventions, with lower conversion rates than classically reported.
Renal oncocytoma is an uncommon benign renal neoplasm of unknown etiology. Bilateral, multicentric renal oncocytomas are rare and diffuse renal oncocytomas are even rarer. We report a patient with incidentally detected marked bilateral nephromegaly due to innumerable oncocytomas. The term "oncocytomatosis" should be strictly applied to cases in which oncocytomas diffusely infiltrate the kidneys.
Because of inability to access a cavernous-carotid fistula through conventional means, a superior ophthalmic vein approach was used to allow access for embolization. Although there was initially robust flow through both the fistula and the ophthalmic artery on angiography, the flow stopped during the procedure, and the patient was found to have an orbital hemorrhage. Immediately on emergent canthotomy and evacuation of the hemorrhage, angiographic evidence of restoration of flow was noted. This finding suggests that vision loss in orbital compartment syndrome may be due to arterial occlusion in some cases, and may be reversible if prompt action is taken.
Four cases in which the diagnosis of developmental venous anomaly (DVA) was made using CT angiography are illustrated. The diagnosis of DVA was confirmed by either MR (all cases), digital subtraction angiography (two cases), or both (one case). This is the first report, to our knowledge, of the CT angiographic appearance of DVA.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.