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

Correct. Tubotympanic CSOM (safe type) has a central perforation with mucoid discharge and no cholesteatoma. It is called 'safe' because it rarely causes complications and is amenable to medical management with surgery (tympanoplasty) for hearing rehabilitation.

Tubotympanic (mucosal/safe) CSOM: central perforation, mucoid/mucopurulent discharge, no cholesteatoma, no bone erosion. Atticoantral (squamosal/unsafe) CSOM: attic or marginal perforation, cholesteatoma, bone erosion, foul-smelling bloodstained discharge.

Attic perforation with cholesteatoma and bone erosion, posterosuperior marginal perforation with foul-smelling discharge, and ossicular erosion with granulation tissue all describe the atticoantral UNSAFE type of CSOM — which requires surgery (mastoidectomy) and carries a risk of intracranial complications.

Correct. The anteroinferior quadrant is the universally accepted safe site for myringotomy. It avoids the ossicular chain (malleus posterosuperiorly), the chorda tympani nerve, and the risk of a high jugular bulb posteroinferiorly.

Anteroinferior quadrant is the safe zone for myringotomy — away from the ossicular chain (posterosuperior), the chorda tympani (posterosuperior), and the jugular bulb (posteroinferior). This must be stated without exception.

Posterosuperior quadrant overlies the ossicular chain and chorda tympani — cutting here causes ossicular damage and taste loss. Posteroinferior quadrant risks the jugular bulb. Anterosuperior is near the neck of the malleus. Only the anteroinferior quadrant is safe.

Correct. OME presents as painless bilateral conductive hearing loss (children often noticed to be inattentive at school) with a flat type B tympanogram (no middle ear pressure peak = non-mobile drum due to fluid). There is no acute pain, fever or discharge.

OME (glue ear): painless, bilateral, conductive hearing loss; flat type B tympanogram; dull retracted amber drum; no fever, no discharge. Most common cause of hearing loss in children 2–8 years.

Acute fever + otalgia + bulging drum = ASOM (not OME). Unilateral foul-smelling attic perforation = atticoantral CSOM. Episodic vertigo + SNHL + tinnitus = Menière's disease.

Correct. Lateral sinus thrombophlebitis presents with high spiking intermittent fever (septicaemia), papilloedema (raised ICP from sinus occlusion), and Griesinger's sign (mastoid tip tenderness from retrograde emissary vein thrombosis). This is a classic CSOM complication requiring urgent surgical management.

Lateral sinus thrombophlebitis: high spiking 'picket-fence' fever + signs of raised ICP (papilloedema, headache) + Griesinger's sign (oedema/tenderness over the mastoid tip from emissary vein thrombosis). Facial palsy may co-exist. Requires IV antibiotics + mastoidectomy + sinus exposure.

Extradural abscess: persistent headache without the septicaemic spikes. Labyrinthitis: vertigo and SNHL without fever spikes or papilloedema. Otitic meningitis: neck stiffness, Kernig's sign, fever — the VI nerve Gradenigo triad is distinctive. The combination of septic spiking fever + papilloedema + mastoid tip tenderness = lateral sinus thrombophlebitis.

Correct. Type III tympanoplasty (myringostapedopexy) is performed when the malleus and incus are absent or non-functional but the stapes is intact and mobile. The tympanic membrane graft is placed directly on the stapes head, creating a columella effect that transmits sound to the oval window.

Wullstein's tympanoplasty types: Type I = myringoplasty (drum repair, ossicles intact); Type II = drum + malleus repair; Type III = drum placed on stapes head (malleus + incus absent, stapes intact and mobile); Type IV = drum on stapes footplate (mobile footplate, ossicular chain absent); Type V = fenestration of lateral SCC. Type III achieves hearing by direct graft-to-stapes coupling.

If the malleus and incus are intact with only the drum needing repair, that is Type I (myringoplasty). Drum on the stapes footplate (after stapedectomy) is Type IV. Fenestration of the horizontal semicircular canal is Type V.

Correct. Cholesteatoma erodes bone primarily through enzyme-mediated mechanisms: the squamous epithelium secretes collagenase, matrix metalloproteinases, and other proteolytic enzymes that digest bone. Keratin accumulation also generates pressure on bone. This explains its progressive, destructive course.

Cholesteatoma is NOT a tumour — it is a misnomer for an accumulation of desquamated keratinising squamous epithelium. It expands by desquamation (keratin accumulation) + collagenase/matrix metalloproteinase enzyme secretion by the epithelium, causing bone resorption. Also pressure effects. Bacterial superinfection causes the foul-smelling discharge.

Osteomyelitis from bacteria is a secondary phenomenon from superinfection, not the primary expansion mechanism. Cholesteatoma is NOT a neoplasm — it is a benign epidermal inclusion cyst. Pus under pressure might contribute minimally but enzyme secretion by the squamous epithelium is the primary destructive mechanism.

Correct. Labyrinthitis complicating CSOM (usually cholesteatoma eroding into the lateral semicircular canal) presents with sudden onset of vertigo, tinnitus, nystagmus and sensorineural hearing loss. Circumscribed labyrinthitis (fistula) may show a positive fistula test; diffuse labyrinthitis results in complete deafness.

Labyrinthitis (circumscribed = fistula in lateral SCC; diffuse = toxins or bacteria invading the entire labyrinth) presents as sudden-onset vertigo + tinnitus + SNHL in a patient with CSOM. Circumscribed labyrinthitis shows positive fistula test (positive pressure → nystagmus). Diffuse causes complete sensorineural deafness.

Petrous apicitis (Gradenigo's) presents with the triad of otorrhoea + VI nerve palsy + deep facial pain — no SNHL/vertigo as the primary features. Subdural empyema causes hemiplegia, altered consciousness. Subperiosteal abscess presents as fluctuant swelling behind the ear with pinna pushed forward.

Correct. First-line medical management of obstructive ETD includes topical intranasal corticosteroids (reduce mucosal oedema around the ET orifice) and autoinflation techniques (Otovent — patient blows against a closed nose, inflating the ET). These are used before surgical intervention.

Obstructive ETD management: (1) Treat underlying cause (allergic rhinitis, sinusitis) — topical nasal steroids reduce peritubular mucosal oedema; (2) Autoinflation devices (Otovent, Politzer) to equalise middle ear pressure; (3) Valsalva manoeuvre. Surgical options (grommets, balloon tuboplasty) reserved for refractory cases. Antibiotics are not indicated for ETD without acute infection.

Prophylactic antibiotics are not indicated for ETD without bacterial infection. Balloon Eustachian tuboplasty is a minimally invasive procedure reserved for pharmacologically refractory cases. Adenoidectomy is relevant primarily in children and not the first-line step in adults with ETD.

Correct. The fundamental reason for mastoidectomy in squamosal CSOM is that cholesteatoma is a physically and enzymatically destructive lesion that cannot be eradicated by any medical treatment. Left untreated, it erodes the ossicular chain, the tegmen, the sigmoid sinus plate and the facial nerve canal, leading to potentially life-threatening intracranial complications.

Squamosal CSOM with cholesteatoma is an unsafe disease requiring surgery because: cholesteatoma cannot be cleared medically; it will continue to expand eroding ossicles, canal wall, tegmen, dural plate and facial nerve canal; risk of intracranial complications (meningitis, brain abscess, lateral sinus thrombophlebitis). Goal: eradicate disease; hearing reconstruction is secondary.

The rationale for surgery in the unsafe type is specifically cholesteatoma's destructive nature — not a failure of antibiotics in central perforation (that is the mucosal safe type). The facial nerve is NOT always at risk in mucosal CSOM — it is at risk specifically when cholesteatoma erodes into the facial nerve canal. CWD mastoidectomy does not improve speech discrimination — it externalises the cavity.