RT Journal Article SR Electronic T1 Spontaneous drainage of an ethmoidal mucocele: a possible cause of pneumosinus dilatans. JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 729 OP 731 VO 12 IS 4 A1 R A Benedikt A1 D C Brown A1 M K Roth A1 C A Geyer A1 V N Ghaed YR 1991 UL http://www.ajnr.org/content/12/4/729.abstract AB