KEY FACTS Terminology Petrous apex (PA) cholesteatoma or epidermoid: PA focus of cholesteatoma due to epithelial rest of embryonal origin You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Synonyms: Petrous apex (PA) arachnoid cyst Definition: Congenital or acquired herniation of posterolateral wall of Meckel cave (MC) into PA You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Petrous apex (PA) asymmetric marrow: Asymmetric pneumatization of PA with nonpneumatized marrow space in opposite PA simulating mass lesion Synonym: PA pseudolesion You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Blood within normally fluid-filled spaces of labyrinth You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Endolymphatic sac tumor (ELST) Papillary cystadenomatous tumor of ELS Originates from epithelium of ELS You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
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KEY FACTS Terminology Osteogenesis imperfecta (OI): Inherited connective disorder characterized by bone fragility and fractures You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Synonym: Otospongiosis Fenestral otosclerosis (FOto), cochlear otosclerosis (COto) Pathologic appearance of lytic spongy bone foci in bony labyrinth of unknown cause Starts perifenestral (FOto), progresses to surround cochlea (FOto + COto) Fissula ante fenestram : Cleft of fibrocartilaginous tissue between inner & middle ears just anterior to oval window You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy…
KEY FACTS Terminology Membranous labyrinth ossification : Healing response to inner ear infection, inflammation, trauma, or surgery You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Definition: Sexually transmitted disease caused by bacterium spirochete Treponema pallidum affecting inner ear You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Definition: Subacute inflammatory or infectious disease of fluid-filled spaces of inner ear You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Dilatation of semicircular canal (SCC) & globular vestibule Bone island between vestibule & affected SCC is small or absent (persistent SCC anlage anomaly) You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
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KEY FACTS Terminology Stenosis or atresia of cochlear nerve canal (CNC) Cochlear nerve deficiency (CND): Cochlear nerve (CN) hypoplasia/aplasia You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Small, underdeveloped cochlea, usually < 2 turns You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Definition: Absent cochlea; vestibule, semicircular canals (SCC), & internal auditory canal (IAC) present in some form You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology Large vestibular aqueduct (LVA) includes enlarged endolymphatic sac and duct IP-II: Incomplete partition type II between middle and apical cochlear turns often seen with LVA IP-II + LVA: Mondini anomaly (historic terminology) You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here
KEY FACTS Terminology IP-II: Incomplete partition due to deficient interscalar septum (ISS) between middle & apical cochlear turns Mondini anomaly (historic terminology): IP-II + large vestibular aqueduct (LVA) You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become membership If you are a member. Log in here