TY - JOUR T1 - Pericoccygeal hidrocystoma. JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 587 LP - 588 VL - 19 IS - 3 AU - S C Chin AU - C Y Chen AU - R A Zimmerman Y1 - 1998/03/01 UR - http://www.ajnr.org/content/19/3/587.abstract N2 - We report the imaging findings of pericoccygeal hidrocystoma in a 52-year-old woman. Sonography showed a large cystic lesion with internal echoes in the pericoccygeal region; it appeared as a well-defined, low-density mass on CT, and as a high-signal-intensity mass on T1- and T2-weighted MR images. Histopathologic examination revealed an apocrine hidrocystoma. ER -