CSOM with Cholesteatoma - Complete Exam Answer Guide

CASE 1 (SMIMER) - 17-year-old male with 5-year history of decreased hearing and left ear discharge

(a) Character of Discharge in Atticoantral CSOM / Cholesteatoma

• Thick, scanty, and foul-smelling (fetid/offensive odor)
• It is purulent with a characteristic putrid smell due to keratin debris and anaerobic bacterial infection
• Does not respond to conservative treatment (unlike tubotympanic disease where discharge is profuse, mucoid, and odorless)
• White flakes represent desquamated keratin squames - a hallmark of cholesteatoma
• Typically unilateral and persistently active

(b) Probable Clinical Diagnosis

(c) Investigation and Management

Investigations

• Pure Tone Audiogram (PTA) - typically shows conductive hearing loss (>30 dB suggests ossicular erosion); SNHL may also be present
• Impedance audiometry / tympanometry
• Speech audiometry

• HRCT temporal bone (both axial and coronal views) - Investigation of choice
  • Shows: scutum erosion (pars flaccida type), posterior canal wall erosion, ossicular erosion, tegmen/sinus plate integrity
  • Note: Pars tensa cholesteatoma shows erosion of posterior-superior wall and lateralization of ossicular chain; no scutum erosion
  • CT cannot reliably differentiate cholesteatoma from granulation tissue
• MRI with Diffusion Weighted Imaging (DWI/non-EPI DWI) - best for:
  • Detecting soft tissue extent
  • Post-operative surveillance for recurrent/residual cholesteatoma (replacing routine second-look surgery in many centers)

• Ear swab for culture and sensitivity (common organisms: Pseudomonas aeruginosa, S. aureus, Bacteroides, Peptostreptococcus)

• Routine blood investigations (CBC, renal/liver function, coagulation - pre-operative)
• Nasal and nasopharyngeal examination (Eustachian tube function assessment)

Management

• Aural toilet (microscopic suction clearance)
• Topical antibiotic-steroid ear drops (ciprofloxacin-based)
• Systemic antibiotics based on culture sensitivity if active infection
• Note: Medical management is NOT curative for cholesteatoma - it merely optimizes the ear pre-operatively

• Preserves posterior canal wall anatomy
• Advantages: Better cosmesis, physiologic middle ear, no cavity maintenance issues
• Disadvantages: Higher residual/recurrent disease rate (11-27% residual; 5-13% recurrent); requires second-look surgery or DWI-MRI at 18 months

• Removes posterior canal wall; creates open mastoid cavity
• Advantages: Lower recurrence (2-10%); residual disease visible on follow-up
• Disadvantages: Lifelong cavity maintenance; meatoplasty required; temperature-induced vertigo; aesthetic concerns

• Ossiculoplasty (Type III tympanoplasty - connecting graft to stapes head) may be done at the time of primary surgery or staged at second-look
• Shambaugh Surgery of the Ear, Cummings Otolaryngology (Chapters on cholesteatoma management)

(d) Pre-operative Consent - Key Discussion Points

1. Nature of the Disease

• Explain that cholesteatoma is a destructive, expanding skin cyst in the middle ear that erodes bone
• Without surgery, it will progressively worsen and lead to serious, life-threatening complications
• It cannot be cured with medicines alone

2. Proposed Surgery

• Name of procedure: Combined Approach Tympanoplasty (CAT) / Modified Radical Mastoidectomy
• Purpose: Remove cholesteatoma, clear infection, and attempt to restore hearing
• Surgery is performed under general anesthesia
• Expected duration and hospital stay

3. Surgical Risks and Complications

• Facial nerve injury - temporary or permanent facial weakness (rare but serious)
• Sensorineural hearing loss (SNHL) or worsening of hearing
• Vertigo/dizziness - from inner ear disturbance
• Tinnitus
• Incomplete removal of cholesteatoma - may require second surgery
• Recurrence/residual disease - especially with CWU technique
• Taste disturbance (chorda tympani nerve handling)
• CSF leak (rare)
• General anesthetic risks

4. If Surgery is Declined / Risks of Non-Surgical Management

• Progressive hearing loss
• Potential for serious complications: meningitis, brain abscess, lateral sinus thrombosis, subdural abscess, labyrinthitis, facial nerve paralysis, petrositis
• These can be life-threatening

5. Post-operative Expectations and Follow-up

• The ear may not be completely dry immediately
• Hearing may not be fully restored (especially if ossicular chain is eroded)
• Long-term follow-up required (yearly otoscopy minimum)
• If CWU performed: MRI or second-look surgery in 12-18 months to check for residual disease
• Cavity maintenance if CWD surgery performed

6. Alternatives

• No curative alternative to surgery for cholesteatoma exists
• Medical management only as temporizing/optimizing measure

7. Type of Consent

• Written informed consent is mandatory before any elective surgery
• Since the patient is 17 years old (minor in most jurisdictions), parental/guardian consent is required along with patient's assent
• Use of clear, simple, non-technical language; interpreter if language barrier exists
• Patient and family must have the opportunity to ask questions

CASE 2 (VALMED) - 45-year-old man with retraction pocket and whitish debris in attic

(a) Provisional Diagnosis

(b) Classification of Complications of CSOM (5 marks)

A. Intratemporal (Extracranial) Complications

B. Intracranial Complications

"Complications are frequent and span one or more clinical conditions in atticoantral disease." - Shambaugh Surgery of the Ear, Table 26-2

"The most common intracranial complication of otitis media is meningitis. Other intracranial complications include epidural abscess, subdural abscess, brain abscess, otitic hydrocephalus, and sigmoid sinus thrombosis." - Schwartz's Principles of Surgery

CASE 3 (KMCRI) - Comprehensive 10-mark Essay: CSOM

Etiopathogenesis

• Eustachian tube dysfunction (most important) - creates negative middle ear pressure
• Recurrent acute otitis media in childhood
• Cleft palate, Down syndrome
• Underdevelopment of mastoid pneumatization
• Socioeconomic factors, malnutrition, overcrowding

1. Chronic Eustachian tube dysfunction → sustained negative middle ear pressure
2. Progressive retraction of pars flaccida or posterior-superior pars tensa → formation of retraction pocket
3. Retraction pocket accumulates desquamated keratin (cannot self-clean) → cholesteatoma sac forms
4. The keratinizing squamous epithelium produces enzymes (collagenases, matrix metalloproteinases) → bone erosion
5. Enlargement of sac into middle ear cleft → erodes ossicles, canal walls, labyrinth, facial canal, tegmen, sigmoid sinus plate

• Invagination theory (most accepted): retraction pocket deepens due to negative pressure and becomes a cholesteatoma sac
• Epithelial migration theory: squamous epithelium migrates through a perforation
• Basal cell hyperplasia theory: proliferation of basal cells in pars flaccida
• Squamous metaplasia theory: middle ear mucosa undergoes metaplastic transformation

Clinical Features

Investigations

Complications

Management

• Aural toilet + topical antibiotics (ciprofloxacin drops)
• Systemic antibiotics (short courses for active infection)
• NOT curative for cholesteatoma

• Canal Wall Up (CWU) Mastoidectomy + Tympanoplasty - preferred in younger patients, good pneumatization
• Canal Wall Down (CWD) / Modified Radical Mastoidectomy (MRM) - better disease clearance, lower recurrence, requires cavity maintenance
• Radical Mastoidectomy - extensive disease, deaf ear, intracranial complications
• Ossicular chain reconstruction - at primary or second-look surgery

CASE 4 (GMC, AETCOM) - Counseling a 24-year-old woman with Atticoantral CSOM

Counseling the Patient and Family

• "You have a chronic infection in the middle ear which has caused a skin growth called cholesteatoma. This growth slowly eats away the bone around it."
• "This is a serious condition - not cancer - but it can cause serious complications if left untreated."

• Without surgery: progressive worsening, increasing hearing loss, and risk of life-threatening complications (meningitis, brain abscess, facial nerve paralysis)
• With surgery: good chance of clearing the disease; hearing may improve partially, but results depend on the extent of ossicular damage already present
• Recurrence is possible even after surgery - regular follow-up is essential
• Fertility, pregnancy, and daily life activities are not directly affected by surgery; patient should know she can lead a normal life post-operatively

• General anesthesia required
• Hospital stay typically 1-3 days
• Recovery period: ~2-4 weeks before return to work
• Ear packing removal at follow-up visit

• If ossicles are eroded: hearing reconstruction (ossiculoplasty) will be attempted but may not achieve normal hearing
• A hearing aid may still be needed post-operatively

• Regular otoscopy for at least 5-10 years (or lifelong) to monitor for recurrence
• If canal wall-up surgery performed: MRI/DWI at 12-18 months, or second-look surgery

• Sudden worsening of hearing
• Facial weakness/deviation
• Severe headache, vomiting, neck stiffness
• High fever, altered sensorium
• Vertigo/imbalance
• These require IMMEDIATE medical attention

Type of Consent

• Written Informed Consent is mandatory before elective surgery
• Patient is an adult (24 years) - she herself signs the consent
• Consent must be voluntary, informed, and competent
• Document: nature of surgery, risks (facial nerve injury, SNHL, recurrence, need for revision surgery), benefits, alternatives, post-op follow-up requirements
• In AETCOM framework: patient autonomy must be respected; if she refuses surgery, document this refusal with explanation of risks
• Assent of family/husband is desirable but not legally required since she is a competent adult
• Interpreter must be present if language barrier exists

1. Marginal/attic perforation + foul-smelling discharge + white flakes = Cholesteatoma until proven otherwise
2. Cholesteatoma = "unsafe" CSOM because it erodes bone and causes serious complications
3. Only surgical treatment is curative - choice between CWU and CWD depends on extent of disease, patient factors, and surgeon experience
4. Complications are classified as intratemporal (mastoiditis, labyrinthitis, facial palsy, petrositis) and intracranial (meningitis, brain abscess, extradural abscess, sinus thrombosis, otitic hydrocephalus)
5. Informed consent requires discussion of nature of disease, surgical risks, prognosis, alternatives, and post-op expectations