Incomplete Partition type I: Radiological Evaluation of the Temporal Bone

Objective: Incomplete partition type I is an uncommon congenital anomaly of the inner ear, characterized by typical cystic cochleovestibular appearance. was firstly defined as cochlea and vestibule without large vestibular aqueduct; however, aqueduct and/or enlarged endolymphatic duct could rarely be seen in incomplete anomaly. Correct diagnosis cochlear malformation differentiation necessary for patient management surgical approach. Our aim to document temporal bone imaging findings a series patients with I.
 Materials Methods: CT (n=85) MRI (n=80) examinations 99 ears 59 were retrospectively evaluated. All structures otic capsule assessed. The appearances vestibule, aqueduct/endolymphatic duct, semicircular canals qualitatively evaluated experienced neuroradiologist. vertical dimension (from point where arises from vestibule) measured on CT/MRI. Anterior-posterior diameter internal acoustic canal aperture CT. nerves sagittal-oblique high T2-weighted imaging.
 Results: had defective unpartitioned basal turn absent interscalar septae, separated but cochlea. all except one. Semicircular usually dysplastic (92.9%). A total 35 (35.3%) duct. Internal wide 21% ears. Cochlear 5.9% nerve either hypoplastic or aplastic about quarter ears.
 Conclusion: In up one-third patients, associated /endolymphatic accompanying ear findings. Although are normal majority cases, auditory brainstem implantation may certain cases