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

CLINICAL SETTING

Dr Ananya Krishnamurthy is the ENT registrar on duty at a district teaching hospital. It is a busy Monday morning clinic. Three members of the same family — the Nairs — arrive together and each has a different problem. Kiran Nair, 6 years old: His mother says he keeps the TV volume too loud and his teacher has complained he is 'daydreaming' in class. He has had four colds in the past year. His mother remembers his right ear was treated for an infection with antibiotics 4 months ago but it never seemed to fully clear up. He has no pain, no discharge, no fever. Anjali Nair, 34 years old (Kiran's mother): She presents with a 3-year history of intermittent left ear discharge that is mucoid and slightly offensive. She has been managing it at home with ear drops. She says her hearing in that ear has been gradually worsening. She denies vertigo, facial weakness, or severe headache. Suresh Nair, 62 years old (Anjali's father): He arrives agitated, holding his left ear. He has had 'a discharging ear for years' but over the past week, the discharge has become foul-smelling and blood-tinged. He now has a severe headache and his face seems asymmetrical — his left eye is not closing fully. His wife whispers to Dr Ananya: 'Last night he seemed confused for a while.'

Trigger 1: First Encounter — Three Patients, Three Diagnoses

Dr Ananya examines all three patients. Kiran (6 years): Tympanometry shows bilateral flat type B curves. Otoscopy reveals bilateral dull, amber-coloured retracted tympanic membranes with no perforation, no discharge. Pure tone audiometry shows bilateral 30 dB conductive hearing loss. No fever. No discharge. Anjali (34 years): Otoscopy reveals a central perforation of the left tympanic membrane with visible mucoid discharge. No cholesteatoma is visible. No attic retraction. CT temporal bone: no bone erosion. Audiometry: 35 dB left conductive hearing loss. Suresh (62 years): Otoscopy shows an attic perforation of the left ear with whitish, caseous debris visible through the perforation. The discharge is foul-smelling and blood-tinged. CT temporal bone: erosion of the scutum and long process of the incus; the tegmen tympani appears intact but the bony facial nerve canal appears thinned. On cranial nerve examination: left lower motor neurone facial palsy (House-Brackmann Grade III) is confirmed.

DISCUSSION POINTS

  • Make a diagnosis for each of the three Nairs. For each diagnosis, identify the two or three SPECIFIC findings from the clinical data that most strongly support your diagnosis.
  • Dr Ananya must decide which patient to prioritise for immediate management. Rank the three patients in order of clinical urgency and justify your ranking.
  • Suresh has been told he has 'chronic ear disease' for years. Why has a routine mucosal ear discharge in some patients progressed to a state that now threatens his facial nerve? What is the term for the whitish debris seen through Suresh's attic perforation, and why is it dangerous?
  • Anjali is anxious about her own ear. She asks: 'Is my ear like my father's — will it get as bad?' How would you explain the difference between the two types of CSOM in plain language that a patient can understand, while being honest about prognosis for each?
Click to reveal Trigger 2: Crisis and Complication — Suresh Deteriorates (discuss previous trigger first!)

Trigger 2: Crisis and Complication — Suresh Deteriorates

Suresh is admitted urgently. Over 12 hours, he develops worsening headache, high spiking fever (39.8°C, temperature spikes every 6–8 hours), neck stiffness, and photophobia. A fluctuant, tender post-auricular swelling has developed and the pinna is displaced anteriorly and inferiorly. MRI brain + temporal bones shows: cholesteatoma extending into the mastoid antrum + a rim-enhancing extradural collection + early meningeal enhancement. Lumbar puncture reveals: turbid CSF, WBC 3,200 cells/µL (predominantly neutrophils), protein raised, glucose low. Meanwhile, Anjali (in the OPD) is asking: 'Should I also have surgery? My GP said my ear is stable.' Kiran's mother has been given an appointment in 3 months for audiological reassessment.

DISCUSSION POINTS

  • List Suresh's complications in order of anatomical location (extracranial → intracranial). For each complication, name it and identify the specific evidence from the clinical picture/investigations that confirms it.
  • Design the surgical management plan for Suresh. Which procedure will you perform, and why? Choose between cortical mastoidectomy, canal wall up mastoidectomy, and canal wall down (modified radical) mastoidectomy. Justify your choice based on the extent of disease. What intraoperative risk demands particularly careful technique, and why?
  • Anjali asks about her own surgery. Her hearing loss is 35 dB conductive and her CSOM has not resolved with topical antibiotics. What surgical procedure would you offer Anjali? What is the name of the operation that repairs both the tympanic membrane perforation and the ossicular chain if needed? What type of tympanoplasty would you plan if the incus is found to be eroded intraoperatively?
  • Kiran's follow-up is booked for 3 months. His mother is worried he will fall behind in school. What is the natural history of OME (what proportion resolve spontaneously and in what timeframe)? If at 3 months he still has bilateral 30 dB CHL with type B tympanograms, what is the next management step and what procedure will be offered?
Click to reveal Trigger 3: Resolution, Rehabilitation and the Bigger Picture (discuss previous trigger first!)

Trigger 3: Resolution, Rehabilitation and the Bigger Picture

One month later: Suresh has undergone a successful left modified radical (canal wall down) mastoidectomy with facial nerve decompression. The cholesteatoma has been completely removed. His facial palsy is recovering (now House-Brackmann Grade II). He is on regular mastoid cavity irrigation. He is told he will have a 'moist cavity' that requires lifelong monitoring and cannot get water in his ear. Anjali has undergone left type I tympanoplasty (myringoplasty). The intraoperative findings showed the ossicular chain intact; the perforation was closed with a temporalis fascia graft. Her post-op hearing has improved to 15 dB CHL. Kiran at 3-month follow-up still has bilateral type B tympanograms and 35 dB CHL bilaterally. He is now reported to have a mild expressive language delay. He has been listed for bilateral myringotomy and grommet insertion.

DISCUSSION POINTS

  • Suresh will have a permanent mastoid bowl. Counsel him on four key aspects of his aftercare: (a) water precautions, (b) cavity inspection frequency, (c) what signs should prompt urgent re-consultation, and (d) whether he can fly in an aeroplane (Eustachian tube pressure equalisation with a fixed cavity).
  • Kiran is listed for bilateral myringotomy and grommet insertion. His parents ask: 'What is a grommet? How will it help him hear? How long does it stay in? What happens when it falls out?' Prepare an age-appropriate explanation for parents that covers the mechanism, duration, follow-up, and what happens if OME recurs after grommet extrusion.
  • Looking at the Nair family as a whole — three members with different stages of middle ear disease — what shared risk factor in the family likely predisposed all three to Eustachian tube dysfunction and otitis media? What preventable environmental and social factors in Indian children contribute to the high burden of CSOM? Propose TWO public health interventions applicable at a primary care level.
  • Suresh's right ear is normal. However, his treating ENT consultant recommends audiological assessment of the right ear and a follow-up CT in 2 years. Why? What condition might develop in the contralateral ear, and what is the general principle for surveillance in patients who have had cholesteatoma on one side?

Group Task Assignments

Group 1: CSOM Classification and Operative Decision-Making

  • Prepare a table comparing tubotympanic (safe) CSOM and atticoantral (unsafe) CSOM across: perforation site, discharge character, cholesteatoma presence, bone erosion, intracranial complications risk, and primary surgical treatment
  • Write the surgical plan for Suresh: justify the choice of canal wall down mastoidectomy over canal wall up in one structured paragraph
  • List all the intracranial and extracranial complications of CSOM from Dhingra/Hazarika — classify them as extracranial vs intracranial, and name the surgical approach for the most common intracranial complication

Competencies: EN4.7, EN4.8, EN4.11

Group 2: OME Management and Grommet Surgery

  • Design a management flow chart for a child presenting with bilateral OME and CHL: from first presentation → watchful waiting → audiological indications for surgery → grommet insertion → post-grommet follow-up → management after grommet extrusion
  • Prepare a written consent explanation for Kiran's parents explaining grommet insertion: what it is, how it works, benefits, risks (otorrhoea, persistent perforation, scarring) and what happens when it falls out
  • Identify the indications for adding adenoidectomy to grommet insertion in children — state the evidence base and the age threshold

Competencies: EN4.4, EN4.15

Group 3: Tympanoplasty and Hearing Rehabilitation

  • Prepare a table of Wullstein's tympanoplasty types I–V: definition, ossicular status at surgery, hearing outcome expected, and indication
  • Anjali's case: her perforation was successfully closed (type I). What is the next surgical option if at 6 months she still has residual 35 dB CHL with an intact drum? Which type of tympanoplasty would address this?
  • Suresh's hearing reconstruction: after cholesteatoma clearance with CWD mastoidectomy, can hearing be reconstructed immediately or is it deferred? State the general rule regarding hearing reconstruction timing in canal wall down procedures and why

Competencies: EN4.10, EN4.11

Group 4: Eustachian Tube Dysfunction and Prevention

  • Explain the anatomy of the Eustachian tube and why children under 7 years are particularly susceptible to otitis media due to ET anatomy
  • Describe the types of Eustachian tube dysfunction (obstructive and patulous), their tympanometric signatures (type C vs type A with respiratory excursions) and their distinct clinical presentations
  • Identify THREE environmental and social risk factors for chronic otitis media that are prevalent in low-to-middle-income settings in India, and propose a primary prevention strategy for each at the community health level

Competencies: EN4.15, EN4.4

Group 5: ASOM Staged Management and Surgical Safety

  • Describe the four stages of ASOM and the specific management at each stage (watchful waiting, antibiotics, myringotomy thresholds)
  • A 5-year-old is brought to casualty at 2 AM with a bulging tympanic membrane and high fever unresponsive to 48 hours of amoxicillin. A decision is made for myringotomy. Draw a diagram of the tympanic membrane showing the four quadrants and mark the safe zone for incision. Name the anatomical structure that runs posterior to the posterosuperior quadrant and one structure that risks injury posteroinferiorly.
  • What are the indications for myringotomy in ASOM? List six specific clinical scenarios from Dhingra in which myringotomy is indicated.

Competencies: EN4.3, EN4.10

Learning Issues

Research these questions and bring your findings to the discussion.

  1. [EN4.3] What are the four stages of ASOM? What is the management at each stage? What are the indications for myringotomy in ASOM? In which quadrant is the incision made and why?
  2. [EN4.4] What is the pathophysiology of otitis media with effusion? What is its natural history? What are the indications for surgical intervention and what does it involve?
  3. [EN4.6] What are the clinical features, investigations and management of tubotympanic (mucosal/safe) CSOM? How is it distinguished from the unsafe type?
  4. [EN4.7] What is cholesteatoma? How does it form (congenital vs acquired)? Why is it called unsafe and what is its mechanism of bone destruction? What are the surgical options?
  5. [EN4.8] List the intracranial and extracranial complications of CSOM. For each: clinical features, investigation of choice, and management.
  6. [EN4.10] Describe the steps of myringotomy and tympanoplasty. What are Wullstein's types I–V? What are the indications for each?
  7. [EN4.11] What are the indications for mastoidectomy? Distinguish between cortical, canal wall up and canal wall down mastoidectomy — when is each used, and what are the long-term aftercare requirements for a CWD cavity?
  8. [EN4.15] Describe the anatomy and functions of the Eustachian tube. What are obstructive and patulous ETD? How is each diagnosed (clinical + tympanometry) and managed?