1/2. Limitations of color Doppler sonography in the imaging of ocular vessels.PURPOSE: To describe a case where detection of blood flow in the central retinal artery and the central retinal vein was limited by an artifact evoked by the optic disc drusen. methods Case report. RESULTS: During color Doppler sonography, examination of optic disc drusen may generate an artifact--the so-called twinkling artifact--which can simulate blood flow and make evaluation of the central retinal vessels impossible. CONCLUSIONS: Twinkling artifact does not allow evaluation of color Doppler sonography in the imaging of ocular vessels.- - - - - - - - - - ranking = 1keywords = vessel (Clic here for more details about this article) |
2/2. Clinical studies on the occurrence and the pathogenesis of optociliary veins.We reviewed retrospectively 20 cases of optociliary vein over the past 5 years. Fifteen of the 20 cases (75%) were over 40 years of age. There was no sex differences (9 males and 11 females). Causative ocular diseases were: central retinal vein occlusion (14 cases, 70%); optic disc drusen (2 cases, 10%); and optic nerve sheath meningioma, high myopia, glaucoma, congenital anomaly (1 case each, total 20%). The number of patients with an optociliary vein was high in central retinal vein occlusion (14/190 cases, 7.4%). We concluded that occurrence of optociliary vein is not restricted to cases with optic nerve sheath meningioma and this shunt vessel may occur under other conditions in which central retinal venous return is seriously disturbed. The most common cause of optociliary vein is central retinal vein occlusion.- - - - - - - - - - ranking = 0.16666666666667keywords = vessel (Clic here for more details about this article) |