surgical approach to middle ear,mastoid mamoon
TRANSCRIPT
SURGICAL APPROACHES TO THE MIDDLE EAR AND MASTOID
DR.MAAMON AMEEN
• The three most commonly used surgical approaches to the middle ear and mastoid are:
• Transcanal, • Endaural, • Postaural
• The decision as to perform any of these approaches should be based on preoperative evaluation .
• The expected extent of surgery, the necessity of opening the mastoid, the given anatomical findings, all have to be considered.
TRANSCANAL APPROACH
TRANSCANAL APPROACH
• Not commonly used in children • Contraindicated in diffuse or localized otitis
externa • Used when the mesotympanum and
hypotympanum are the surgical sites
Indications• Tympanoplasty• Ossiculoplasty• stapedectomy • Removal of glomus tympanicum • Exploratory tympanotomy • Second look” tympanotomy• Repair of round window after rupture
TRANSCANAL APPROACH
Preparation • Done G/A and L/A• Wax is cleared from EAC • Hairs clipped from EAC• If a temporalis graft is to be used, a
small portion of hair is shaved just above the pinna.
TRANSCANAL APPROACH
• position • Canal is cleaned with pyodine
and draped applied • Canal is cleard by genlte suction
TRANSCANAL APPROACH
LA (lignocain with adrenalin)
TRANSCANAL APPROACH
Procedure
• Incision is made
TRANSCANAL APPROACH
• Reflection of the tympanomeatal flap
TRANSCANAL APPROACH
TRANSCANAL APPROACH
• The superior portion of the tympanomeatal flap is completed
• Curettage of the posterosuperior canal wall scutum
• The tympanomeatal flap is completed when the posterior edge of the long process of the malleus, the long process of the incus, the stapes, the stapedius tendon, and the round window are visible, and the flap is reflected anteriorly without tension
TRANSCANAL APPROACH
Closure of wound
• Flap is replaced • Incision line sealed with gelatin
sponge • Light pack in EAC placed
TRANSCANAL APPROACH
ENDAURAL APPROACH
• Commonly used in infants and young children• Accessibility to epitympanum and postero-
superior part of mesotympanum• Temporalis fascia and tragal cartillage graft can
be easily obtained• faster and less traumatic compared to the
postaural approach• Difficult to gain access to mastoid tip cells
• Tympanoplasty• Atticotomy and atticoantrostomy • Congenital and acquired cholesteatoma in the
epitympanum • meatal stenosis • Excision of osteomas and exostoses of ear canal• Large tympanic membrane perforation• Modified radical mastoidectomy
ENDAURAL APPROACH
Indications
Anaesthesia • additional injections are placed in
the incisura of the pinna
ENDAURAL APPROACH
The incision
ENDAURAL APPROACH
Flap elevation
ENDAURAL APPROACH
Middle ear cavity opened
ENDAURAL APPROACH
• Exposure of mastoid and temporalis fascia
ENDAURAL APPROACH
• Exposure of mastoid antrum
ENDAURAL APPROACH
• Exposure of attic and mastoid bowl
ENDAURAL APPROACH
• Atticotomy
ENDAURAL APPROACH
Closure of the wound • Bipp pack is commonly used • Vicryl stitches to approximate
edges • Skin is closed with silk • Firm mastoid bandage is applied
ENDAURAL APPROACH
• frequently used in children.• fascia graft can be readily
obtained from the temporalis muscle
• Excellent approach to mastoid
POSTAURAL APPROACH
• Cortical mastoidectomy • MRM and radical mastoidectomy • Combined approach tympanoplasty • Cochlear implantation• Facial nerve surgery • Translabyrinthine removal of acoustic tumour• Retrolabyrinthine approach to CP angle
POSTAURAL APPROACH Indications
Indications • Carcinoma of the middle ear • Extensive glomus jugulare tumours • Rarely ,thrombophlibitis arising from
lateral sinus thrombosis • Some cases of congenital atresia
POSTAURAL APPROACH
• The anesthesia is the same as that described for the transcanal approach,
• Additional injection sites are required in the postauricular area
POSTAURAL APPROACH
Incision• A transcanal incision is made from the 6 to 12
o’clock position about one third of the distance from the annulus to the meatus to create a tympanomeatal flap
POSTAURAL APPROACH
INCISION
POSTAURAL APPROACH
INCISION IN CHILDREN
POSTAURAL APPROACH
Elevation of Skin Flap
POSTAURAL APPROACH
Incising Periosteum
POSTAURAL APPROACH
Elevation of Periosteal Flap
POSTAURAL APPROACH
POSTAURAL APPROACH
Mac Ewen’s Triangle
POSTAURAL APPROACH
POSTAURAL APPROACH
Closure of the wound • Periosteal edges are
approximated • Skin closed with interrupted silk• Firm mastoid bandage applied
POSTAURAL APPROACH
Complications Immediate Facial nerve paralysisAcute SOM vertigoTM perforation Dead earDistortion or lost of taste Persistent bleeding Perichondritis
Complications Delayed Dead earPersistent vertigoPersistent perforationMeatal stenosis
Thank you