Ahmed Fathy Emam MBBCh, Presenter: Nothing to Disclose

Nagy Naguib Naeem Naguib MD, MSc, Abstract Co-Author: Nothing to Disclose

Nour-Eldin Abdelrehim Nour-Eldin MD, MSc, Abstract Co-Author: Nothing to Disclose

Mohammed Ahmed Alsubhi BMBS, Abstract Co-Author: Nothing to Disclose

Thomas Josef Vogl MD, PhD, Abstract Co-Author: Nothing to Disclose

Documentation of the incidence of Human accessory Semicircular canal (SCC) of the Inner Ear in Different age groups and both sexes during three Dimensional (3D) reconstruction of high resolution MR-Imaging.

During a retrospective study that was performed on 536 patients (294 females & 242 males) with a mean age of 48.5 year (standard deviation: 26.5, range: 5 month - 88 year) using High resolution MR-Imaging with an Iso-Space sequence of 0.6 mm slice thickness. 3D reconstructions were performed using Advantage Workstation for diagnostic imaging. The reconstruction was manually performed for each side in all patients and included semicircular canals of the inner ear. The Incidence and origin of the accessory SCC were observed and documented. For cases with detected accessory SCC the source images were revised to exclude the possibility of motion artifacts.

Three dimensional reconstruction was successfully performed on all 1,072 inner ears. Any records and abnormalities observed were recorded and documented. The Accessory SCC was observed in 13 patients, appeared bilateral in 5 Patients and unilateral in 8 patients with a total of 18 inner ears showing accessory SCC (incidence 1.7%). All 13 patients were referred with Vertigo, Dizziness, and Hearing impairment. The accessory SCC had a common origin with other SCCs in 8 inner ears with the common origin been with the Superior SCC (n= 3) and with the Lateral SCC (n= 5) giving a double-stranded shape of the SCC. A separate origin of the accessory SCC was observed in 10 inner ears. None of the accessory SCCs showed a common origin with the posterior SCC.

The incidence of Human accessory Semicircular canal (SCC) of human Inner Ear in 1.7% of patients, appeared bilateral in 5 Patients(38.4%) and unilateral in 8 patients(61.6%).

This study shows incidence of an abnormality in the human Inner ear that could be a cause of  symptoms as Vertigo, Dizziness and Hearing impairment.

Emam, A, Naguib, N, Nour-Eldin, N, Alsubhi, M, Vogl, T, Human Accessory Semicircular Canal: Incidence during Three Dimensional Reconstruction using High Resolution Magnetic Resonance Imaging of the Inner Ear.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14045769.html