EN4.{3-4,6-8,10-11,15} | Otitis Media and Middle Ear Surgery — Practice Quiz

Correct. A bulging, hyperaemic drum with loss of light reflex indicates pus under pressure behind the intact tympanic membrane — the hallmark of the suppuration stage. Otalgia is maximal at this stage and spontaneous rupture may follow.

ASOM stages: (1) tubal occlusion — mild retraction; (2) presuppuration — red injected drum; (3) suppuration — bulging drum with pus behind it, severe otalgia; (4) resolution — spontaneous perforation with mucopurulent discharge and pain relief, or complete resolution.

The stage of tubal occlusion produces mild retraction without hyperaemia. Presuppuration shows redness and injection of the membrane but without the bulging that indicates pus accumulation. Resolution follows spontaneous rupture, with discharge and pain relief. The described picture — bulging + hyperaemia — precisely maps to suppuration.

Correct. The anteroinferior quadrant is universally taught as the safe zone for myringotomy. Superiorly lie the ossicular chain (malleus handle); posterosuperiorly, the chorda tympani exits; a high-riding jugular bulb may be present posteroinferiorly. The anteroinferior quadrant avoids all these structures.

The anteroinferior quadrant is the safe site for myringotomy: it is free of ossicles (malleus handle lies posterosuperiorly), the jugular bulb (which rides high in some individuals posteroinferiorly), the chorda tympani nerve, and the facial nerve. Never cut in the posterosuperior or anterosuperior quadrants.

The posterosuperior quadrant overlies the ossicular chain and the round window niche — incision here risks ossicular damage and chorda tympani injury. The posteroinferior quadrant risks a high-riding jugular bulb. The anterosuperior quadrant is near the neck of the malleus. Only the anteroinferior quadrant is safe.

Correct. OME (glue ear) presents with bilateral conductive hearing loss in children following URTIs, with a dull retracted amber-coloured drum and a flat type B tympanogram. There is no pain, fever, or discharge — distinguishing it from ASOM. The fluid behind the drum is thick mucoid (hence 'glue').

OME (otitis media with effusion / glue ear): painless, bilateral, conductive hearing loss; amber or blue retracted drum; flat type B tympanogram (no peak = no TM mobility); commonest cause of hearing loss in children aged 2–8 years. Absent fever or discharge distinguishes it from ASOM.

ASOM is acute and painful with fever and a bulging drum. Mucosal CSOM has a central perforation with intermittent mucopurulent discharge. Patulous ET dysfunction causes autophony and is not associated with a flat tympanogram bilaterally in a child. The painless, bilateral, subacute presentation with type B tympanogram is classic OME.

Correct. This is atticoantral (squamosal) CSOM — the UNSAFE type. The attic perforation, whitish keratinous debris (cholesteatoma), foul-smelling bloodstained discharge and CT-confirmed ossicular erosion are the hallmarks. This requires mastoidectomy; medical treatment alone is inadequate.

CSOM safe vs unsafe: tubotympanic (mucosal) = central perforation, mucoid discharge, no cholesteatoma — safe. Atticoantral (squamosal) = attic/marginal/posterosuperior perforation + cholesteatoma (keratinous debris, bone erosion, foul smell) — UNSAFE, surgically dangerous. Complications (meningitis, brain abscess, facial palsy) arise from the unsafe type.

Tubotympanic (mucosal/safe) CSOM has a CENTRAL perforation with mucoid, odourless or mildly offensive discharge and no cholesteatoma. Tympanosclerosis is a mucosal CSOM sequel (calcific deposits) but causes a different appearance. The combination of attic perforation + whitish debris + foul smell + bone erosion = cholesteatoma = UNSAFE type without exception.

Correct. Gradenigo's syndrome (petrous apicitis) is the classic presentation of otitic meningitis with ipsilateral VI nerve palsy: otorrhoea + VI nerve palsy + deep facial/retroorbital pain ± meningism. It results from spread of infection to the petrous apex where the VI nerve runs through Dorello's canal.

Gradenigo's syndrome (petrous apicitis triad): (1) otorrhoea (CSOM), (2) ipsilateral VI nerve palsy (abducens nerve palsy — convergent squint), (3) retroorbital/facial pain (trigeminal V1). Meningism occurs when infection extends to meninges. The VI nerve is vulnerable in Dorello's canal at the petrous apex.

Extradural abscess presents with headache and low-grade fever but not the specific VI nerve palsy. Subdural empyema causes confusion, focal neurological deficits and herniation but the VI nerve palsy is not its hallmark. Lateral sinus thrombophlebitis causes spiking 'picket-fence' fever with papilloedema. The triad of otorrhoea + VI nerve palsy + retroorbital pain is pathognomonic of Gradenigo's.

Correct. A maximum CHL of 55 dB in mucosal CSOM strongly suggests ossicular discontinuity (the air-bone gap from perforation alone is usually 20–30 dB). Tympanoplasty with ossiculoplasty (type III — myringostapedopexy, or type IV) is required to both close the perforation and reconstruct the ossicular chain for hearing rehabilitation.

Tympanoplasty types: I = myringoplasty only (drum repair, no ossicular work); II = drum + malleus repair; III = drum placed directly on intact stapes head (ossicular chain disrupted); IV = drum on mobile stapes footplate; V = fenestration of lateral semicircular canal. A 55 dB CHL suggests ossicular discontinuity, requiring type III/IV ossiculoplasty for hearing rehabilitation.

Cortical mastoidectomy alone addresses the mastoid disease but not the hearing loss. Myringoplasty (type I) only closes the perforation and would not correct a 55 dB CHL due to ossicular discontinuity. Radical mastoidectomy is reserved for unsafe CSOM with cholesteatoma — it sacifices hearing.

Correct. A pearly-white keratinous mass (cholesteatoma) eroding the posterior canal wall and extending into the antrum requires a canal wall down (modified radical) mastoidectomy to exteriorise the cavity and allow complete matrix clearance. Leaving the canal wall up in such extensive disease risks residual/recurrent cholesteatoma.

Cholesteatoma surgery: the principle is complete matrix removal. Canal wall down (CWD / modified radical mastoidectomy) lowers the posterior canal wall to externalise the mastoid and improve cholesteatoma clearance — preferred when disease extends into the antrum or when follow-up is uncertain. Canal wall up preserves anatomy but requires second-look surgery to check for residual disease.

Cortical mastoidectomy opens the mastoid antrum but preserves the canal wall — inadequate for cholesteatoma extending into the antrum with canal wall erosion. Canal wall up technique also preserves the posterior canal wall and is used for limited disease with reliable follow-up. Myringoplasty alone addresses only the tympanic membrane and is wholly inadequate for cholesteatoma.

Correct. Grommets restore middle ear ventilation by creating a tympanostomy — a temporary bypass for the dysfunctional Eustachian tube — equalising middle ear pressure, preventing negative pressure accumulation and allowing drainage of any effusion. This is the direct mechanical mechanism.

Ventilation tubes (grommets) equalise middle ear pressure by providing an alternative air pathway that bypasses the dysfunctional Eustachian tube, draining effusion and preventing its re-accumulation. They do not affect nasopharyngeal bacteria or mucosal immunity directly.

Grommets do not eliminate nasopharyngeal colonisation (adenoidectomy reduces bacterial load to some extent). They do not stimulate mucosal immunity. The aditus ad antrum connects the epitympanum to the mastoid antrum — grommets have no effect on it.

Correct. Obstructive Eustachian tube dysfunction results from failure of the ET to open adequately during swallowing/yawning. This generates negative middle ear pressure, explaining the type C tympanogram (negative peak pressure), aural fullness, low-frequency hearing loss and tinnitus. Worsening on Valsalva confirms pressure imbalance.

Obstructive (dilatory) ETD: failure of ET to open during swallowing → negative middle ear pressure → type C tympanogram (negative peak pressure) → retracted drum, effusion, conductive hearing loss and tinnitus. Type C = negative peak pressure. Patulous ET (open too wide) shows type A tympanogram with respiratory excursions and causes autophony.

Patulous (too open) ET causes autophony (hearing own voice resonating in the ear), pulsatile tinnitus and a type A tympanogram with respiratory oscillations — the opposite problem. Barotrauma would have an acute onset following air travel or diving. NPC should always be excluded in adults with unilateral ETD but the bilateral, chronic, symmetrical picture is more consistent with obstructive ETD.

Correct. For OME in children, watchful waiting for 3 months is the first step because 80% resolve spontaneously. Surgery is deferred unless the effusion and hearing loss persist for more than 3 months, or there are significant developmental, educational or speech-language concerns.

OME management: ~80% of cases resolve spontaneously within 3 months. NICE/Dhingra guidance: watchful waiting for 3 months (with hearing aids if needed) before offering surgical intervention. Antibiotics are not routinely indicated. Surgery (myringotomy + grommets ± adenoidectomy) is reserved for bilateral OME persisting beyond 3 months with ≥25–30 dB CHL or developmental/speech concerns.

Immediate grommet insertion is not justified without a trial of watchful waiting in uncomplicated OME. Antibiotics are not recommended as first-line treatment for OME (unlike ASOM). Adenoidectomy alone has some evidence in children over 4 years but is not the first-line step before a 3-month watchful waiting period.