HTHSCI 2F03 Lecture Notes - Lecture 13: Vestibular Schwannoma, Neuroma, Otosclerosis

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 2F03
• Professor: Bruce Wainman

Document Summary

Locally destructive expansion of stratified squamous epithelium within the middle ear. Acquired: 2o to attic perforation in chronic suppurative. Sensation of sound w/o external sound stimulation. Mri if unilateral to exclude acoustic neuroma. Assoc. symptoms: n/v, hearing loss, tinnitus, nystagmus. Dilatation of endolymph spaces of membranous labyrinth (endolymphatic oedema) Attacks occur in clusters and last up to 12h. Impaired conduction anywhere between auricle and round window. Defects of cochlea, cohlear n. or brain. Benign, slow-growing tumour of superior vestibular n. Slow onset, unilat snhl, tinnitus vertigo. Mri all pts. c unilateral tinnitus / deafness. Ad condition characterised by fixation of stapes at the oval window. Hl improved in noisy places: willis" paracousis. Pta shows dip (caharts notch) @ 2khz. Anomalies of pinna, external auditory canal, tm or ossicles. Detection and mx of hearing loss before 6mo improves language. Malfusion accessory tags/auricles and preauricular pits, fistulae or sinuses. Sinuses may get infected, mimicking a sebaceous cyst.