title: Temporal bone chondroblastoma totally invisible on MRI.
abstract: We report a case of temporal bone chondroblastoma that was totally invisible on MRI. The patient was a 64-year-old man who presented with several months history of vertigo. The CT scan with bone window setting showed destruction of the temporomandibular joint, the floor of the middle cranial fossa, and the superior semicircular canal. Calcific foci were seen within the tumor. On MR imaging, the tumor, situating mainly medial to the temporomandibular joint, showed no signal on both T1- and T2-weighted images. The tumor was not enhanced with gadolinium. In summary, the tumor was totally signal negative or "invisible" on pre- and postcontrast T1- and T2-weighted images. The tumor was resected through transpetrosal - transzygomatic approach.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Iwate Medical University, Japan; Department of Otolaryngology, Head and Neck Surgery, Kyoto University, Graduate School of Medicine, Japan. Electronic address: hhiraumi@ent.kuhp.kyoto-u.ac.jp.
authors.forename: Harukazu
authors.initials: H
authors.lastname: Hiraumi
authors.affiliation: Department of Neurosurgery, Kyoto University, Graduate School of Medicine, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Arakawa
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Kyoto University, Graduate School of Medicine, Japan.
authors.forename: Norio
authors.initials: N
authors.lastname: Yamamoto
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Kyoto University, Graduate School of Medicine, Japan.
authors.forename: Tatsunori
authors.initials: T
authors.lastname: Sakamoto
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Kyoto University, Graduate School of Medicine, Japan.
authors.forename: Juichi
authors.initials: J
authors.lastname: Ito
mesh_terms: D002804:Chondroblastoma / Q000150:complications / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D012888:Skull Neoplasms / Q000150:complications / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D013701:Temporal Bone / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed; D014717:Vertigo / Q000209:etiology
keywords: Gadolinium; Temporomandibular joint; Transpetrosal approach; Transzygomatic approach