TY - JOUR T1 - Primary mucocele of the petrous apex: MR appearance. JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 203 LP - 204 VL - 13 IS - 1 AU - T L Larson AU - M L Wong Y1 - 1992/01/01 UR - http://www.ajnr.org/content/13/1/203.abstract N2 - Mucoceles of the petrous apex are rare. Their MR appearance varies depending on the degree of hydration or inspissation of the contents. Concise preoperative diagnosis is helpful, since mucoceles are better drained to the mastoids via an infralabyrinthine approach rather than the more risky middle cranial fossa approach used for cholesteatomas. ER -