title: Pericoccygeal hidrocystoma.
abstract: 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.
authors.affiliation: Department of Diagnostic Radiology, Tri-Service General Hospital, National Defensive Medical Center, Taipei, Taiwan, ROC.
authors.forename: S C
authors.initials: SC
authors.lastname: Chin
authors.forename: C Y
authors.initials: CY
authors.lastname: Chen
authors.forename: R A
authors.initials: RA
authors.lastname: Zimmerman
mesh_terms: D005260:Female; D018251:Hidrocystoma / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D012445:Sacrococcygeal Region; D013544:Sweat Gland Neoplasms / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D014463:Ultrasonography