Analytical Study of Temporal Bone Pathologies and Anatomical Variations on High Resolution CT.
Temporal Bone Pathologies and Anatomical Variations on High Resolution CT
Background: High Resolution Computed Tomography (HRCT), a modification of routine CT, owing to its ability to delineate intricate osseous anatomy and admirable topographic visualization, is widely used for accurate assessment of temporal bone pathologies prior to surgical exploration. The present study was undertaken to evaluate temporal bone in diseased ears by HRCT and its importance in patient management. Subjects and Methods: This prospective study was conducted in the department of Radiodiagnosis of a large tertiary care hospital in Northern India. A total of 50 patients with clinically proven middle ear disease with hearing loss or chronic suppurative otitis media (CSOM) were enrolled into this study. All cases were evaluated with 128 slice CT scanner (Philips Medical systems, Cleveland, USA). Results: Mean age of patients in our study was 29.52 ± 21.48 years. Maximum patients with temporal bone pathologies had either sclerosed or under-pneumatized mastoids. Limited numbers of anatomical variations were noted with Korner's septum being the most common variation (7.14 %). Others variations included high jugular bulb (2.86 %), facial nerve dehiscence (2.86 %), labyrinthine fistula (2.86 %) and foramen tympanicum (1.43 %). Otomastoiditis was the most frequently encountered pathological condition in the study population (72.86 %), followed by cholesteatoma (32.86 %). Congenital malformations were seen in 10 cases (14.29%) with type I incomplete partition (5.71%) being the most common malformation. Conclusion: HRCT of temporal bone is useful in identifying common ear pathologies and anatomical variations prior to the surgery and thereby planning appropriate surgical approach.