title: Pantopaque contrast mimicking intracanalicular vestibular schwannoma.
abstract: Pantopaque (iophendylate) is an oily contrast medium historically used during spine imaging. Due to its persistence in the subarachnoid space and the potential to lead to severe arachnoiditis, it is no longer used today. We present a 40-year-old male with new-onset headaches, imbalance, and vertigo. Brain magnetic resonance imaging revealed a 2-mm T1 -hyperintense intracanalicular lesion. Numerous hyperdense foci were scattered throughout the subarachnoid space on computed tomography. Further history revealed the patient received Pantopaque 30 years prior, after sustaining spinal trauma. Remnant Pantopaque contrast is an important differential when evaluating a patient with a suspected intracranial tumor in order to avoid unwarranted surgical intervention. Laryngoscope, 127:1916-1919, 2017.
authors.affiliation: Department of Otorhinolaryngology, Mayo Clinic, Phoenix, Arizona, U.S.A.
authors.forename: Nicholas L
authors.initials: NL
authors.lastname: Deep
authors.affiliation: Neuroradiology Division, Department of Radiology, Mayo Clinic, Phoenix, Arizona, U.S.A.
authors.forename: Ameet C
authors.initials: AC
authors.lastname: Patel
authors.affiliation: Neuroradiology Division, Department of Radiology, Mayo Clinic, Phoenix, Arizona, U.S.A.
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Hoxworth
authors.affiliation: Department of Otorhinolaryngology, Mayo Clinic, Phoenix, Arizona, U.S.A.
authors.forename: David M
authors.initials: DM
authors.lastname: Barrs
mesh_terms: D000328:Adult; D002530:Cerebellopontine Angle / Q000000981:diagnostic imaging* / Q000378:metabolism*; D003287:Contrast Media / Q000009:adverse effects* / Q000378:metabolism*; D003937:Diagnosis, Differential; D007758:Ear, Inner / Q000000981:diagnostic imaging* / Q000378:metabolism*; D006801:Humans; D007481:Iophendylate / Q000009:adverse effects* / Q000378:metabolism*; D008279:Magnetic Resonance Imaging; D008297:Male; D009464:Neuroma, Acoustic / Q000000981:diagnostic imaging*; D013997:Time Factors; D014057:Tomography, X-Ray Computed
chemical_list: D003287:Contrast Media; D007481:Iophendylate
keywords: Iophendylate; Pantopaque; cerebellopontine angle; contrast media; vestibular schwannoma