Inside out VS Outside in Mastoidectomy
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🦻Inside out Mastoidectomy VS Outside in Mastoidectomy
| Topic | Inside-out Mastoidectomy | Outside-in Mastoidectomy |
|---|---|---|
| Definition | Start from the middle ear/attic and work outward to aditus, antrum and mastoid - selective, disease-directed removal. | Start from the mastoid cortex and work inward to antrum, aditus and middle ear - wide exenteration of mastoid cells. |
| Approach / Sequence | Tympanomeatal flap → atticotomy → clear attic → aditus → antrum → mastoid air cells (from inside → out). | Post-auricular incision → expose mastoid cortex → drill mastoid air cells → reach antrum → widen aditus/attic → disease clearance → tympanoplasty. |
| Extent of mastoid clearance | Selective - remove only diseased cells; preserve healthy mastoid | Extensive - exenterate most accessible mastoid air cells (wide clearance) |
| Typical indications | - Isolated attic cholesteatoma - Limited pediatric cholesteatoma - Combined approach tympanoplasty when disease centered in attic/epitympanum | - Diffuse mastoid disease - Acute/coalescent mastoiditis - Cases where mastoid is the primary site of disease - When landmarks are intact and wide access needed |
| Skill level required | High - technically demanding; requires detailed anatomical knowledge and experienced surgeon. | Lower - landmark-based and systematic; suitable for trainees / more predictable. |
| Main advantages | - Targeted/disease-directed clearance - Less bone removal → smaller cavity - Potentially shorter operative time (if surgeon experienced) - Good for attic-predominant pediatric disease | - Systematic, landmark-based (easier to teach / learn) - Wide exposure → lower chance of hidden residual disease - Good for diffuse mastoid involvement and acute mastoiditis |
| Main disadvantages / risks | - Higher technical difficulty - Risk of missing disease in hidden recesses (retrofacial, tip, retrosigmoid cells) if not meticulous - Landmarks may not be encountered in usual order | - More bone removed (larger cavity) - Longer operating time - Risk of over-drilling normal mastoid where unnecessary - Less efficient for attic-predominant disease |
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