Anomalous Subarcuate Canal and Artery: A Rare Anatomical Variation

Document Type : Case Report


Department of Otorhinolaryngology and Head and Neck Surgery, Dr. S.N. Medical College, Jodhpur, Rajasthan, India.


An aberrant or anomalous subarcuate artery and its canal is an extremely rare and clinically significant finding. If accidentally nicked or injured, it can cause inadvertent hemorrhage and obscure the surgical field.
Case Report:
We present a case of 21 year old made with Chronic Otitis Media of the right ear who was incidentally diagnosed with a dilated subarcuate canal and an aberrant subarcuate artery atypically associated with lateral semicircular canal and facial nerve.
Prior knowledge of this symptomatically dormant variation is important, particularly in retrofacial tympanomastoidectomy and cerebello-pontine angle tumor surgeries. Pre-operative temporal bone scans are advisable in such cases.


  1. Wadin K, Wilbrand H. The topographic relations of the high jugular fossa to the inner ear: A Radioanatomic Investigation. Acta radiol. 1986 May 30; 27(3):315–24.
  2. Grammatica A, Alicandri-Ciufelli M, Molteni G, Marchioni D, Presutti L. Subarcuate canal and artery: A case report. Surg Radiol Anat. 2010; 32(2):171–4.
  3. Akyol Y, Galheigo D, Massimore M, Fatterpekar G. Subarcuate artery and canal: An important anatomic variant. J Comput Assist Tomogr. 2011; 35(6):688–9.
  4. Mouret J, Rouviere H. The Petromastoid Canal. 1904. p. 6e session, Toulouse, France.
  5. Proctor B. The petromastoid canal. Ann Otol Rhinol Laryngol. 1983; 92(6):640–4.
  6. HILDING DA. PETROUS APEX AND SUBARCUATE FOSSA MATURATION. Laryngoscope. 1987; 97(10):1129–35.
  7. Wilbrand H, Rauschning W, Ruhn G. The subarcuate fossa and channel. A radioanatomic investigation. Acta Radiol - Ser Diagnosis. 1986 Nov 30;27(6):637–44.
  8. Mazzoni A. The subarcuate artery in man. Laryngoscope. 1970 Jan 1;80(1):69–79.
  9. Mazzoni A. Internal auditory artery supply to the petrous bone. Ann Otol Rhinol Laryngol. 1972;81(1):13–21.