title: Transcanal endoscopic resection for leiomyoma of the external auditory canal and a review of the literature.
abstract: Leiomyoma usually originates from the uterus and alimentary tract, but in extremely rare cases leiomyoma can appear in the external auditory canal. Here we present a 37-year-old man with right auricular fullness. Preoperative findings suggested benign tumor or cholesteatoma in the right external auditory canal. We performed total resection using an endoauricular approach with transcanal endoscopic ear surgery. Histopathological and immunohistochemistry examination confirmed the diagnosis of leiomyoma of external auditory canal. Leiomyoma arising from soft tissue, including that in the external auditory canal, is classified into two types: that from the arrectores pilorum muscles and that from the muscle coats of blood vessels. Only four cases of leiomyoma of external auditor canal have been published in the English literature. The other four cases demonstrated vascular leiomyomas. This is the first report of leiomyoma of the EAC arising from arrectores pilorum muscles.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, National Sendai Medical Center, Japan. Electronic address: ryoukich@hotmail.com.
authors.forename: Ryoukichi
authors.initials: R
authors.lastname: Ikeda
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, National Sendai Medical Center, Japan.
authors.forename: Masaru
authors.initials: M
authors.lastname: Tateda
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, National Sendai Medical Center, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Okoshi
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, National Sendai Medical Center, Japan.
authors.forename: Shinkichi
authors.initials: S
authors.lastname: Morita
authors.affiliation: Department of Pathology, National Sendai Medical Center, Japan.
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, National Sendai Medical Center, Japan.
authors.forename: Sho
authors.initials: S
authors.lastname: Hashimoto
mesh_terms: D000328:Adult; D004424:Ear Canal / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D004428:Ear Neoplasms / Q000175:diagnosis / Q000601:surgery*; D004724:Endoscopy / Q000379:methods*; D005260:Female; D006801:Humans; D007889:Leiomyoma / Q000175:diagnosis / Q000601:surgery*; D008279:Magnetic Resonance Imaging; D013506:Otologic Surgical Procedures / Q000379:methods*; D014057:Tomography, X-Ray Computed
keywords: Arrectores pilorum muscles; Auricular fullness; External auditory canal; Leiomyoma; Transcanal endoscopic ear surgery