Flammer, B. Wicki, R.H. Laeng, Acute asymmetric upper nasal quandrantanopsia caused by a chiasmal colloid cyst in a patient with multiple sclerosis and bilateral retrobulbar neuritis, Am. J. Ophthalmol. 132 (2001) 286- 288.Hanspeter E. Killer MD Josef Flammer MD Barbara Wicki MD and ...