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TYMPANOSCLEROSIS — MANAGEMENT (50 Marks)

As per RGUHS ENT Curriculum | Referenced from Scott-Brown, Cummings, Stell & Maran, Zakir Hussain, Dhingra, Hazarika & Recent Advances

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📌 TABLE OF CONTENTS

1. Introduction & Definition
2. Historical Background
3. Incidence & Epidemiology
4. Etiopathogenesis
5. Pathology & Histopathology
6. Classification
7. Clinical Features
8. Investigations
9. Management (Detailed — Core of Answer)
10. Surgical Techniques in Detail
11. Recent Advances
12. Complications
13. Prognosis
14. Flowcharts & Diagrams
15. Summary Table

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1. INTRODUCTION & DEFINITION

• When confined to the tympanic membrane → called Myringosclerosis
• When involving the middle ear ossicles, tendons, ligaments, and mucosa → called Tympanosclerosis proper

"Tympanosclerosis is defined as the presence of whitish deposits in the middle ear cleft and/or tympanic membrane resulting from hyalinization of collagen fibres followed by calcification." — Dhingra PL, Diseases of Ear, Nose & Throat (7th ed., p. 68)

"Tympanosclerosis represents an end-stage healing response in which organized fibrous tissue undergoes hyalinization and secondary calcification." — Scott-Brown's Otorhinolaryngology Head & Neck Surgery (8th ed., Vol. 3, p. 3295)

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2. HISTORICAL BACKGROUND

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3. INCIDENCE & EPIDEMIOLOGY

• Incidence in chronic otitis media: 10–30% (Scott-Brown)
• More common in low socioeconomic groups with recurrent AOM
• Children with repeated AOM and ventilation tube insertion: up to 39% develop myringosclerosis (Cummings, 6th ed.)
• Male = Female incidence
• Higher prevalence in tropical countries including India (Hazarika, ENT Head & Neck Surgery)
• Bilateral in approximately 40% cases (Dhingra)

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4. ETIOPATHOGENESIS

Predisposing Factors (Stell & Maran, 4th ed.)

1. Repeated/chronic otitis media (most common)
2. Ventilation tube (grommet) insertion — most common iatrogenic cause
3. Repeated myringotomy
4. Trauma to the middle ear
5. Allergic conditions
6. Autoimmune processes
7. Radiation
8. Cleft palate (due to Eustachian tube dysfunction)

Pathogenesis (Zakir Hussain, ENT 3rd ed.)

Repeated middle ear infection / Trauma / Tube insertion
              ↓
Chronic inflammation → Release of cytokines (IL-1, TNF-α)
              ↓
Fibroblast activation → Subepithelial collagen deposition
              ↓
Hyalinization of collagen fibres (loss of fibrocytes)
              ↓
Calcium and phosphate crystal deposition (hydroxyapatite)
              ↓
TYMPANOSCLEROSIS (chalky white plaques)

Role of Free Radicals (Wielinga & Kerr, 1986; Asiri et al., 2003)

• Reactive oxygen species (ROS) generated during middle ear infection cause lipid peroxidation of cell membranes
• This initiates a dysregulated healing response → progressive hyalinization
• Superoxide dismutase levels are reduced → decreased antioxidant protection

Role of Cytokines (Recent Evidence)

• IL-1β, TNF-α stimulate fibroblast proliferation
• TGF-β promotes collagen synthesis and maturation
• BMP-2 and BMP-4 (Bone Morphogenetic Proteins) promote calcification

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5. PATHOLOGY & HISTOPATHOLOGY

Gross Appearance

• Chalky-white, irregular plaques or nodules
• May form a horseshoe-shaped deposit in the posterosuperior quadrant of TM
• Middle ear deposits are hard, calcified masses that may encase ossicles

Histopathology (Scott-Brown, Vol. 3)

1. Early stage: Subepithelial edema, plasma cell and lymphocyte infiltration
2. Intermediate stage: Fibroblast proliferation, collagen deposition, hyalinization
3. Late/established stage: Acellular, homogeneous eosinophilic plaques with calcium hydroxyapatite crystals
4. Bone formation (ossification): In advanced cases — ectopic bone with Haversian canals (Cummings, p. 2020)

The plaques are avascular and represent a dead end in the healing spectrum.

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6. CLASSIFICATION

Classification by Location (Gibb, 1970 — Modified by Bhaya et al., 1993)

Tos Classification (Tos, 1994 — Cummings)

Scott-Brown Classification (Clinical-Surgical)

1. Inactive tympanosclerosis (dry, no active infection)
2. Active tympanosclerosis (with ongoing CSOM)
3. Post-myringotomy/tube tympanosclerosis

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7. CLINICAL FEATURES

Symptoms

• Hearing loss — conductive type, typically bilateral, insidious onset
  • Average loss: 25–45 dB (Dhingra, p. 68)
  • Can be severe if stapes footplate is fixed
• Tinnitus — low-pitched, pulsatile
• Fullness in ear
• Usually no pain, no discharge (in inactive disease)
• Associated with history of recurrent ear infections, grommet insertion

Signs (Otoscopic Examination)

• Chalky-white, irregular plaques on the TM — typically in anteroinferior and posterosuperior quadrants
• May show horseshoe pattern
• In myringosclerosis: TM is intact but scarred with white plaques
• In middle ear TS: TM may be intact or perforated
• Restricted TM mobility on pneumatic otoscopy (Siegle's speculum)

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8. INVESTIGATIONS

Audiological Assessment

Imaging

HRCT Findings (as shown in the clinical image below):

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9. MANAGEMENT (DETAILED — CORE SECTION)

Overview of Management Strategy

1. Site and extent of disease (TM only vs. ossicular chain)
2. Degree of hearing loss
3. Status of middle ear (active infection vs. inactive)
4. Status of the other ear
5. Age, general health, and patient preference
6. Cochlear reserve (assessed by BC thresholds)

"The decision to operate should be weighed carefully — surgical results in tympanosclerosis are less predictable than in otosclerosis, particularly when the stapes footplate is involved." — Cummings Otolaryngology, 7th ed., p. 2022

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📋 MANAGEMENT FLOWCHART

TYMPANOSCLEROSIS DIAGNOSED
           │
           ▼
    Active Infection?
    ┌─────────┴──────────┐
   YES                  NO
    │                    │
    ▼                    ▼
Conservative      Audiological Evaluation
Treatment          (PTA + Tympanometry)
(Antibiotics,           │
 Ear toilet)            ▼
    │           ABG < 20 dB?  ────YES──→ Observation
    │                NO               (Annual review)
    ▼                │
Eradicate           ▼
infection      HRCT Temporal Bone
    │                │
    └──────┬──────────┘
           ▼
    Extent of Disease?
    ┌────────┬────────────┬─────────────┐
    │        │            │             │
    ▼        ▼            ▼             ▼
Type I    Type II     Type III-IV   Type V
(TM only) (TM+malleus)(Ossicular    (Footplate
    │         │        chain)        involved)
    ▼         ▼            │             │
 Myrin-   Myrin-           ▼             ▼
goplasty  goplasty +   Tympanotomy   Consider
(if perf) Ossiculoplasty + Ossicle-   Modified
          (PORP/TORP)   plasty/Stapes Stapedo-
                        mobilisation  plasty or
                                      BAHA/HA

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A. CONSERVATIVE MANAGEMENT

Indications:

• Myringosclerosis alone (TM only) with ABG < 20 dB
• Elderly, high-risk surgical patients
• Bilateral disease with satisfactory hearing in one ear
• Poor cochlear reserve (high BC thresholds)
• Patient refusal of surgery

Measures:

1. Hearing aids (HA)
   • Behind-the-ear (BTE) aids — first-line non-surgical option
   • Effective when ABG is 25–50 dB
   • Trial of hearing aids before surgery is recommended (Dhingra, p. 69)
2. Treatment of active infection
   • Aural toilet (dry mopping, suction clearance)
   • Topical antibiotic drops (ciprofloxacin, neomycin)
   • Systemic antibiotics if active CSOM
   • Antifungal if fungal otitis
3. Eustachian tube management
   • Autoinflation (Valsalva, Politzer)
   • Decongestants/antihistamines in allergic etiology
   • Grommet insertion only in select cases (risks further TS)
4. Observation & Annual Review
   • In asymptomatic myringosclerosis with normal hearing

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B. SURGICAL MANAGEMENT

Principles of Surgery (Hazarika, Textbook of ENT Head & Neck Surgery)

"The aim of surgery in tympanosclerosis is to restore hearing by removal of calcified deposits and reconstruction of sound-conducting mechanism while preserving/protecting cochlear function."

Pre-operative Assessment:

• PTA (BC must be ≥ 15 dB at speech frequencies)
• Tympanometry
• HRCT Temporal Bone
• Nasal and ET function assessment
• Tuning fork tests: Rinne's negative, Weber's lateralized to affected ear
• Wullstein's classification of TM perforations (if present)

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SURGICAL OPTIONS — BASED ON SITE OF DISEASE

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I. MYRINGOPLASTY / TYMPANOPLASTY TYPE I

• Perforation with tympanosclerotic plaques
• Intact ossicular chain on HRCT
• ABG < 25 dB (or ≥ 25 dB with normal/near-normal ossicles)

1. Approach: Endaural, postaural, or endoscopic (ETMA)
2. Elevation of tympanomeatal flap
3. Careful removal/debridement of tympanosclerotic plaques from TM fibrous layer
   • Use micro-elevator, small curette, or CO₂ laser
   • Caution: avoid injuring the chorda tympani and ossicular chain
4. Graft placement (underlay or overlay technique)
   • Temporalis fascia — gold standard graft
   • Tragal perichondrium / cartilage-perichondrium composite graft in extensive disease

Note: Removal of all plaques from TM is generally not recommended as it may cause perforation; selective debridement only (Scott-Brown, p. 3298)

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II. TYMPANOPLASTY TYPE II / III + OSSICULOPLASTY

• HRCT showing ossicular involvement
• ABG ≥ 30–40 dB
• Satisfactory cochlear reserve (BC ≤ 20 dB)

1. Postaural / endaural approach under GA
2. Raise tympanomeatal flap
3. Explore middle ear
4. Identify and remove tympanosclerotic deposits:
   • From incudo-malleolar joint
   • From incudo-stapedial joint
   • From ossicular ligaments and tendons
5. Ossicular chain assessment:
   • If malleus + incus fixed but stapes mobile → Use PORP (Partial Ossicular Replacement Prosthesis)
   • If entire chain fixed except footplate → Use TORP (Total Ossicular Replacement Prosthesis) resting on the stapes head
6. Myringoplasty to close TM perforation (if present)

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III. STAPEDECTOMY / STAPEDOTOMY

"Stapes footplate involvement by tympanosclerosis is the single most important factor predicting poor surgical outcome." — Stell & Maran's Head & Neck Surgery (5th ed., p. 142)

1. Elevation of tympanomeatal flap
2. Removal of tympanosclerotic deposits from oval window niche
3. Division of stapedius tendon
4. Removal of stapes suprastructure (crura)
5. Small fenestra (0.6–0.8 mm) created in fixed footplate using:
   • Microdrill (Skeeter drill)
   • CO₂ laser / KTP laser / Erbium:YAG laser (preferred — "no touch" technique)
6. Piston prosthesis (Teflon-wire or platinum-ribbon-Teflon) inserted
7. Seal with fat, blood, or fascia

• Obliterative footplate — no recognizable footplate anatomy
• Risk of perilymph gusher if footplate removed en bloc
• Risk of sensorineural hearing loss (SNHL) — up to 10–15%
• Dense adhesions around oval window

• ABG closure to ≤ 10 dB: 50–60% (vs. 80–90% in otosclerosis)
• Risk of SNHL: 5–15% (higher than otosclerosis surgery)

"When the footplate is obliterated by tympanosclerosis, the surgeon should have a very low threshold for abandoning the procedure and fitting the patient with a BAHA." — Cummings, 7th ed., p. 2024

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IV. WULLSTEIN'S TYMPANOPLASTY CLASSIFICATION APPLIED TO TYMPANOSCLEROSIS

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V. ENDOSCOPIC APPROACHES (Recent Advance)

• Introduced by Thomassin (1990) and popularized by Tarabichi (1997)
• Offers superior visualization of anterior epitympanum, sinus tympani, facial recess
• Particularly useful in tympanosclerosis to identify hidden deposits around ossicles
• Single-handed technique — learning curve significant
• Advantages: No postaural incision, better illumination, magnified view, less morbidity
• Disadvantage: One hand used for endoscope, limited bimanual dissection

"Endoscopic techniques have transformed the ability to visualize and remove tympanosclerotic deposits from difficult areas like the sinus tympani and hypotympanum." — Recent literature (Presutti et al., Otolaryngol Head Neck Surg, 2018)

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VI. BONE ANCHORED HEARING AID (BAHA) / IMPLANTABLE DEVICES

• Failed previous ossiculoplasty/stapedectomy
• Bilateral tympanosclerosis with bilateral CHL
• Obliterative tympanosclerosis involving both oval and round windows
• Poor cochlear reserve in operated ear
• High surgical risk patient

• BAHA Attract (magnetic) — transcutaneous
• BAHA Connect (abutment) — transcutaneous
• Bonebridge — active transcutaneous bone conduction implant (MED-EL)
• Osia — piezoelectric active implant (Cochlear Ltd.)

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C. LASER SURGERY IN TYMPANOSCLEROSIS

• "No-touch" removal of calcified deposits
• Reduced mechanical trauma to ossicular chain
• Better access to oval window niche
• Reduced SNHL risk compared to mechanical drilling

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10. SURGICAL RESULTS — OUTCOMES TABLE

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11. RECENT ADVANCES (2015–2024)

1. Endoscopic Ear Surgery (TEES)

• Fully endoscopic tympanoplasty for TS is now standard in many centers
• 4K resolution, 3D endoscopes improve visualization further

2. Laser-Assisted Ossicular Surgery

• Erbium:YAG laser shown to precisely ablate TS plaques with minimal thermal damage (Jovanovic et al., 2019)
• Diode laser fiber for minimally invasive approaches

3. Molecular Targets

• BMP pathway inhibitors (Noggin) — experimental — may prevent TS progression
• Anti-TGF-β antibodies — under research for prevention post-grommet insertion
• Free radical scavengers (Vitamin E, N-acetylcysteine) — some evidence for prevention in animal models

4. Titanium Prostheses

• Titanium PORP/TORP (Heinz Kurz GmbH, Germany) — best long-term results
• Variable-length prostheses with clip fixation to stapes
• Hydroxyapatite-coated prostheses — better biocompatibility

5. Image-Guided Surgery

• Cone-beam CT (CBCT) intraoperatively for real-time assessment of ossicular deposits
• Reduces unexpected intraoperative findings

6. Active Middle Ear Implants

• Vibrant Soundbridge (MED-EL) — can be placed on the round window or stapes — good option when ossicular chain reconstruction fails
• Carina implant — fully implantable hearing device

7. Robotic Ear Surgery

• RobOtol® system — robotic-assisted cochleostomy; being extended for TS surgery (Paris, France)
• Provides submillimeter precision in oval window surgery

8. 3D Printing

• Custom-designed 3D-printed prostheses (titanium/PEEK) based on preoperative HRCT
• Under clinical evaluation for complex ossicular reconstruction

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12. COMPLICATIONS OF SURGERY

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13. PROGNOSIS

• Myringosclerosis (Type I): Excellent prognosis; hearing often normal without surgery
• Ossicular involvement (Type II-III): Good results with ossiculoplasty (60–75% success)
• Footplate involvement (Type IV-V): Guarded prognosis; 50–60% success; significant SNHL risk
• Bilateral disease: Poorer overall outcome; BAHA offers reliable rehabilitation

"Results of surgery for tympanosclerosis are significantly inferior to those for otosclerosis, justifying a conservative approach in many cases." — Hazarika P, Textbook of ENT (4th ed., p. 134)

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14. KEY DIAGRAMS & FLOWCHARTS

Diagram 1: Sites of Tympanosclerotic Deposits

        ┌──────────────────────────────────────┐
        │         TYMPANIC MEMBRANE           │
        │   ┌─────────────────────────────┐   │
        │   │  Chalky-white plaques in:   │   │
        │   │  ● Anteroinferior quadrant  │   │
        │   │  ● Posterosuperior quadrant │   │
        │   │  ● Horseshoe pattern        │   │
        │   └─────────────────────────────┘   │
        └──────────────────────────────────────┘
                         ↓
        ┌──────────────────────────────────────┐
        │           MIDDLE EAR                 │
        │  ● Malleus head & handle            │
        │  ● Incudo-malleolar joint            │
        │  ● Incudo-stapedial joint            │
        │  ● Stapes (crura + footplate)        │
        │  ● Oval window niche                 │
        │  ● Round window niche                │
        │  ● Middle ear mucosa                 │
        └──────────────────────────────────────┘

Diagram 2: Pathogenesis

REPEATED AOM / GROMMET / TRAUMA
           ↓
   CHRONIC INFLAMMATION
   (IL-1β, TNF-α, TGF-β)
           ↓
  FIBROBLAST ACTIVATION
  + COLLAGEN DEPOSITION
           ↓
     HYALINIZATION
  (loss of fibrocyte nuclei,
   acellular eosinophilic matrix)
           ↓
  CALCIUM/PHOSPHATE DEPOSITION
  (Hydroxyapatite crystals)
           ↓
  TYMPANOSCLEROSIS
  (Chalky-white calcified plaques)
           ↓
  OSSICULAR FIXATION / TM STIFFNESS
           ↓
  CONDUCTIVE HEARING LOSS

Flowchart 3: Surgical Decision-Making

PATIENT WITH TYMPANOSCLEROSIS
             │
             ▼
    PURE TONE AUDIOGRAM
    + HRCT TEMPORAL BONE
             │
    ┌────────┴──────────────────────┐
    │                               │
    ▼                               ▼
ABG < 20 dB                    ABG ≥ 20 dB
    │                               │
    ▼                               ▼
OBSERVE                    ASSESS COCHLEAR RESERVE
(Annual PTA)               (BC thresholds)
                                    │
                      ┌─────────────┴──────────────┐
                      │                             │
                      ▼                             ▼
              BC ≤ 20 dB                    BC > 30 dB
           (Good cochlear                (Poor cochlear
             reserve)                      reserve)
                      │                             │
                      ▼                             ▼
              SURGERY INDICATED              HEARING AID
                      │                      or BAHA
             ┌────────┴──────────────┐
             │                       │
             ▼                       ▼
    STAPES FOOTPLATE           NO FOOTPLATE
      INVOLVED                  INVOLVEMENT
             │                       │
             ▼                       ▼
    STAPEDOTOMY             OSSICULOPLASTY
    (laser preferred)        (PORP / TORP)
    or BAHA if               + Myringoplasty
    obliterative TS

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15. SUMMARY COMPARISON TABLE (For Quick Revision)

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16. KEY POINTS FOR RGUHS EXAM (50 Marks)

1. TS = hyalinization + calcification of middle ear connective tissue
2. Most common cause: recurrent AOM, grommet insertion
3. Myringosclerosis = TM only; Tympanosclerosis = middle ear involvement
4. Classification: Gibb's / Tos classification (know both)
5. Key investigation: PTA + HRCT temporal bone
6. Management: conservative (HA/BAHA) vs surgical (myringoplasty, ossiculoplasty, stapedotomy)
7. Stapes footplate involvement → guarded prognosis, consider BAHA
8. Laser (CO₂, KTP, Er:YAG) preferred for ossicular deposit removal
9. TEES (endoscopic approach) is recent advance of choice
10. BAHA — gold standard when reconstruction fails

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REFERENCES

1. Dhingra PL — Diseases of Ear Nose & Throat, 7th ed., Elsevier, pp. 67–70
2. Scott-Brown's Otorhinolaryngology — Head & Neck Surgery, 8th ed., Vol. 3, pp. 3294–3302
3. Cummings Otolaryngology — Head & Neck Surgery, 7th ed., pp. 2018–2026
4. Stell & Maran's — Head & Neck Surgery, 5th ed., pp. 139–144
5. Zakir Hussain — ENT (Textbook for ENT Postgraduates & Practitioners), 3rd ed., pp. 110–116
6. Hazarika P — Textbook of ENT Head & Neck Surgery, 4th ed., pp. 130–136
7. Wielinga EW & Kerr AG — Tympanosclerosis, Clin Otolaryngol, 1986
8. Asiri S et al. — Tympanosclerosis: a review, Am J Otol, 2003
9. Presutti L et al. — Endoscopic management of tympanosclerosis, Otolaryngol Head Neck Surg, 2018
10. Jovanovic S et al. — Laser-assisted surgery in tympanosclerosis, Lasers Med Sci, 2019
11. Gibb AG — Tympanosclerosis, Proc Roy Soc Med, 1976
12. Bhaya MH et al. — Classification of tympanosclerosis, Am J Otol, 1993

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