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Infratemporal fossa approaches
1.
2. Tumors arising from or extending into the ITF
from neighboring regions provide a
challenge as to how best to approach the
area
Tumors within the ITF are rare, making up
less than 1% of head and neck tumors
The ITF approaches are categorized as
anterior (transfacial, transmaxillary,
transoral, and transpalatal),
lateral (transzygomatic and lateral
infratemporal), or
inferior (transmandibular and transcervical)
3. The pioneers of the ITF were Conley and
Barbosa
Barbosa indicated the ITF approach for
advanced tumors into the maxillary sinus. 1960
n 1969, Terez et al used a craniofacial
approach for tumors invading the pterygoid
fossa but residual tumor could not be avoided.
In 1976, House and Hitselberger described a
transcochlear approach for tumors that
originated medially to the internal auditory
canal or from the clivus.
In 1977, Fisch and coworkers reported the
posterolateral ITF approach
4. The postauricular
infratemporal fossa
approaches as
described by Fisch
He has divided these
techniques into three
basic approaches
Type A
Type B
Type C
5. indicated for meningiomas,
cholesteatoma involving the
internal carotid artery and
petrous apex, for
intratemporal neuromas
of cranial nerves IX-XII and
for lesions reaching the skull
base from below (Carotid
artery aneurysms, glomus
vagale tumors etc).
Incisions and Skin Flaps
Anteriorly based periosteal
flap elevation.
the tertiary branches of the
facial nerve are identified
and protected with periosteal
flap.
6. Closure of the
External Auditory
Canal
The cartilaginous
canal skin is everted
and sutured with
absorbable sutures
and reinforced
medially with the
periosteal flap
elevated off the
mastoid cortex
7. Removal of External
Auditory Canal Wall
Skin and Tympanic
Membrane
tympanic annulus is
elevated, the
incudostapedial joint
is separated, the
tensor tympani
tendon is cut, and
the neck of the
malleus is nipped
8. Cervical Dissection
Major structures,
including the
common, external,
and internal carotid
arteries, the internal
jugular vein, and
cranial nerves IX to XII,
are identified
Division of the posterior
belly of the digastric
Ligation of the
occipital artery and
ascending pharyngeal
9. Extratemporal Facial
Nerve Dissection
located deep to the
midpoint of a line
between the tragal
pointer cartilage and
the mastoid tip
by cutting overlying the
parotid gland and
freeing it from the
underlying parotid tissues
required for anterior
transposition in the type
A approach
10. Radical
Mastoidectomy
removes the air cell
tracts lateral and
adjacent to the otic
capsule
The stapes
suprastructure is
removed to prevent
inner ear trauma
The eustachian tube is
obliterated with bone
wax
11. FACIAL NERVE
TRANSPOSITION
from the geniculate
ganglion distal to the
stylomastoid foramen
At the stylomastoid
foramen, the facial nerve is
densely adherent to the
surrounding fibrous tissue
A new bony canal is drilled
in the anterior wall of the
epitympanum to receive
the nerve
all medial attachments to
the nerve should be sharply
dissected to prevent
stretch injury
12. OCCLUSION OF THE
SIGMOID SINUS
Bone is removed over
the posterior fossa
dura anterior and
posterior to the
sigmoid sinus to allow
ligation
Dural vessels are
coagulated
A small CSF leak may
occur and is easily
controlled with a
sutured muscle plug
13. EXPOSURE OF JUGULAR BULB
AND INTERNAL CAROTID
ARTERY
process is fractured and
removed with the attached
muscles.
The parotid gland is dissected
from the tympanic bone, and
a modified self-retaining
laminectomy retractor is
placed behind the ramus of
the mandible to effect
anterior subluxation
removal of bone over the
carotid artery and beneath
the otic capsule, the jugular
fossa is exposed for tumor
removal
14. TUMOR REMOVAL
The jugular vein is ligated to
prevent tumor and air
embolism. Dissection begins
by freeing the internal carotid
artery and rotating the tumor
posteriorly
The lateral wall of the sigmoid
sinus is removed along with
intraluminal tumor
The inferior margin of the
tumor is elevated, and the
extracranial tumor is removed
Profuse bleeding may occur
from the entrances of the
inferior petrosal sinus into the
jugular bulb.
15. the posterior fossa
dura is opened, and
the intracranial
portion of the tumor
is excised
16. CLOSURE OF WOUND
Fascia lata provides the best
material for reconstruction,
lyophilized dura can be used
to seal the defect.
Abdominal fat is used to
obliterate the dead space of
the temporal bone, and the
temporalis muscle is rotated
inferiorly for reinforcement of
the wound
The skin is closed routinely,
and a bulky pressure dressing
is applied for a minimum of 5
days to prevent leakage of
CSF
17. This provides access to the
clivus and petrous apex and
is applicable to glomus
tumors involving the
horizontal petrous carotid
artery, clival chordoma, and
congenital cholesteatoma of
the petrous apex.
transposition of the nerve
usually is not required
Reflection of the temporalis
muscle still attached to the
coronoid process and the
zygoma allows the retractor
to expose the superior
infratemporal fossa
exposure in the type B
approach are defined by the
middle cranial fossa floor,
mandibular condyle, and
reflected temporalis muscle
18. The middle meningeal
artery and V3 branch of the
trigeminal nerve require
bipolar cauterization and
transection
The carotid artery may be
uncovered from its vertical
segment to its anterior limit
at the foramen lacerum
after separation from the
soft tissues around the
eustachian tube
Elevation of the carotid
artery permits additional
access to the petrous apex
and clivus.
19. Transcochlear approach
to the petrous apex.
A, Posterior translocation
of the facial nerve.
GSPN, greater superficial
petrosal nerve.
B, Subtotal
petrosectomy with
removal of the otitic
capsule
Tumors of the clivus, such
as chordomas, up to the
parasellar area may be
removed through the
type B approach
20. Type C Approach
posterolateral access to
the rostral clivus, cavernous
sinus, sphenoid sinus,
peritubal space,
pterygopalatine fossa, and
nasopharynx
used primarily for extensive
juvenile nasopharyngeal
angiofibroma and
radiation failure squamous
cell carcinoma.
The base of the pterygoid
process is removed to
approach the sphenoid
sinus and cavernous sinus
22. Sen and Sekhar and
colleagues
can expose the upper
cervical segment (without
facial nerve transposition)
and the intrapetrous
segment of the internal
carotid artery
permits access to the
petrous apex, clivus, and
superior infratemporal fossa
and may be extended to
include the nasopharynx,
parasellar area,
pterygopalatine fossa, and
anterior infratemporal fossa
23. Advantage of preauricular approach
preserving hearing
Facial .n need not to b rerouting
Disadvantage inability to access tumours
extending temporal bone and posterior fossa
The Fisch C and D approaches both provide
excellent access to structures within the ITF, as
well as the basisphenoid, clivus, and entire
intratemporal course of the internal carotid
artery.
adverse outcomes include dysfunction of the
facial nerve, conductive hearing loss, and
dental malocclusion.
24.
25. large middle meatal
antrostomy and
complete
sphenoethmoidecto
my
endoscopic medial
maxillectomy was
performed.
The inferior turbinate
was crushed and cut
with a scissors
26. A mucosal incision
was made from the
cut inferior turbinate
onto the floor of the
nasal cavity and was
extended posteriorly
to the back of the
inferior turbinate.
27. the lower half of the
middle turbinate was
removed to achieve
full visualization of
the nasal
component of the
tumour
28.
29. This allows the second
surgeon to keep the
operating field clear of
blood, even if there is
profuse bleeding
present, or to place
traction on the tumor,
allowing the primary
surgeon to dissect
around the tumor,
freeing it from its
attachments in areas
such as the infraorbital
fissure and the lateral
extensions into the ITF
30.
31. Lack of formal control of the internal
carotid artery or internal jugular vein.
this technique is not suitable for tumors
with invasion or encasement of these
structures.
In addition, if there is tumor extension
through the dura into the middle cranial
fossa or laterally into the masseteric
space and inferiorly into the
parapharyngeal space,
32. Several anterior approaches to the
infratemporal fossa
Transoral, Transantral, Transpalatal,
Transmaxillary, Extended maxillotomy,
Maxillary swing, Transmandibular,
Transzygomatic , Facial translocation,
Transcranial, Combined
These approaches allow good access to
the anteromedial ITF, nasopharynx ,
basisphenoid, and middle cranial fossa.
may result in facial deformity, facial and
infraorbital nerve dysfunction, and lacrimal
dysfunction
33. The superior gingivolabial sulcus posteriorly is close to
the tuberosity of the maxilla and provides access to
the lower part of the infratemporal fossa.
An approach through this area does not provide
enough exposure for removal of tumours,
the view is obstructed by fatty tissue and there is no
vascular control.
However, the recess provides access for biopsy
purposes especially if the lesion is located low in the
infratemporal fossa.
Occasionally a benign tumour may be removed
through this approach.
34. The antral cavity is entered through a
sublabial incision, extending from the
level of the canine to the first molar
tooth and the mucoperiosteal flap is
elevated until the infraorbital foramen,
so as to preserve the infraorbital vessels and
A window is made into the anterolateral wall of the
antrum large enough to provide good exposure of
the complete posterior wall of the maxillary sinus.
The roots of the canine and premolars are preserved.
The antral mucosa on the posterior wall is incised at its
junction with the medial, lateral and superior walls,
and the mucoperiosteal flap is reflected down.
35. The periosteum on the outer surface of
the posterior wall is incised along its
medial, lateral and superior border and
reflected downwards.
At the end of the procedure the bony
posterior wall and the mucoperiosteal
flap are replaced.
This approach is not suitable for tumour
excision by itself, but may be combined
with other approaches. It is invariably
employed for the purpose of obtaining a
biopsy.
36. The authors Kornfehl et al. have basically described a
transpharyngeal approach via the palate.
The nasopharynx is reached via an ‘S'-shaped incision
running vertically on the soft palate and on to the anterior
pharyngeal arch towards the side of the lesion.
The mucosa of the lateral wall of the nasopharynx is
incised vertically, the superior constrictor muscle of the
pharynx is split to enter the most medial part of the
infratemporal fossa.
Kornfehl et al. employed this approach to extirpate a
cavernous haemangioma close to the lateral pterygoid
muscle which had been shown not to have any feeding
vessels.
This is not a safe approach for tumour excision.
The internal carotid artery is close to the pharyngeal wall
and it is not possible to obtain any control on the vessel.
37. It was originally described by
Langenbeek in 1859 as an
osteoplastic technique for tumours
of the pterygopalatine fossa.
An incision is placed in the buccal
sulcus above the attached
gingivae between the maxillary
second premolars.
the incision is placed half a
centimetre above the apices of
tooth to ensure the viability of the
teeth.
A mucoperiosteal flap is raised.
The nasal septum is separated
from the anterior nasal spine and
the maxillary crest and the facial
soft tissue are retracted cranially.
38. An osteotomy incision is placed, using an
electric burr from one maxillary tuberosity to the
other.
The incision passes just under the zygomatic
buttress and divides the anterior nasal aperture.
An osteotomy of the medial wall of the maxilla is
performed through the inferior meatus to the
palatine canal. At this stage the palate and the
inferior portion of the maxilla remain attached
by the pterygomaxillary suture, the thin posterior
wall of the maxillary sinus and the bone forming
the canal of the palatine vessels.
Using a curved osteotome the maxilla is
separated and disimpacted downwards.
The buttress of bone anterolaterally and at the
piriform nasal aperture are preserved so that
they can be approximated at closure.
39. This is essentially a transantral
approach with an extended
sublabial incision taken from the
midline to the maxillary tuberosity
and carried down to the
periosteum.
The posterior wall of the maxillary
sinus is widely excised allowing
access to the pterygomaxillary
portion of the tumour.
The medial wall of the maxillary
sinus and the nasopharynx is
removed. Lateral extension of the
tumour can be exposed by
removing the lateral wall of the
antrum.
It can also be combined with a
transpalatal approach. It was
described by Krause and Baker
who used it mainly for surgical
treatment of nasopharyngeal
angiofibroma.
40. The concept of approaching the retromaxillary area
through a mandibulotomy is not new and has been
advocated by Conley and Barbosa. The infratemporal
fossa communicates inferiorly with the neck.
If the mandible is laterally retracted and the medial
pterygoid muscle is detached from its mandibular
attachment the infratemporal space can be reached.
This approach provides good control of the vessels and
nerves and en bloc resection of nasopharynx, posterior
maxilla, infratemporal fossa structures, mandibular ramus
and parotid gland can be performed.
The procedure has been modified by Attia et al. to
obtain wide field exposure without sacrifice of either
mandibular function or the sensory supply of the face
and oral cavity.
41. The mandibular osteotomies are
arranged to spare the inferior alveolar
nerve and vessels and are positioned
under the intercondylar notch above
the opening of the mandibular canal
and just medial to the mental
foramen.
Detachment of the medial and
lateral pterygoid muscles and the
sphenomandibular ligament allows
the mandibular segment to be
reflected superiorly .
This provides direct access to the
infratemporal fossa; osteosynthesis of
the mandible and intermaxillary
fixation is performed. The procedure
preserves function, exposure is good
and is cosmetically acceptable.
42. Incision – Weber Ferguson incision
without gingivolabial component
Bilateral tarsorraphy should be
performed
Inverted “U” shaped incision is
marked out on the hard palate
After deepening the facial incision
the lacrimal sac should be
skeletonized and sectioned at its
lower end.
Infra orbital nerve should be
sectioned as it comes out of
infraorbital foramen.
Periosteum of the inferior orbital wall
should be elevated.
Osteotomies should be performed on
the frontal process of maxilla and at
the maxillo zygomatic suture.
The maxillo ethmoidal junction should
be separated using a straight
osteotome.
43. The mucoperiosteum over the hard
palate should be elevated based on
the contralateral greater palatine
vessels. The ipsilateral greater palatine
vessels were cauterized and sectioned.
A straight osteotome should be placed
between the arms of a v shaped notch
located on the anterior nasal spine and
hammered in order to separate the
maxilla down the middle.
Now the whole maxilla with its
attached cheek tissue can be swung
like a door laterally exposing the whole
of nasopharynx.
Mass in the naso pharynx can now be
removed under direct vision.
Maxilla can be repositioned after
surgery and secured in position by using
miniplate and screws.
44. Radical excision of tumours and the
relatively limited access obtained by any
single approach have made combined
approaches necessary.
It offers the patients the maximum
benefit of the technical ‘know-how’ of
the surgical team and the best
opportunity for surgical excision.
Notes de l'éditeur
Type A has
anterior transposition of nerve VI1 as its distinguishing
feature, without zygomatic displacement Type B has the
facial nerve left in situ and the zygoma reflected inferiorly,
with the frontal branch of the nerve protected
by the temporalis muscle and the bone of the middle
fossa removed for exposure of the infratemporal fossa.
The mandibular branch of cranial nerve V and the middle
meningeal artery are sacrified. Type C is the logical
anterior extension of this, with skeletonisation of the
maxillary branch of the trigeminal nerve and resection
of the pterygoid plates for exposure of the nasopharynx.
Type D differs from the other three approaches in that
the skin incision is preauricular and can only provide
anterior exposure. In it the zygoma is retracted, with the
lateral orbital rim and the carotid found and followed as
before.
Cartilaginous skin elevated uto conchal bowl and suturd with fla elevated poateriorly frm mastoid cortex as water tightsac
The greater auricular nerve should be sectioned as distally as possible in the parotid for potential use as an interposition graft if needed
Transection of the glossopharyngeal nerve often is necessary to follow the carotid artery into the skull bas
the middle fossa may easily be accessed through a temporal craniotomy
Exposure of the clivus can be obtained by sharp incision of the fibrous attachments at the petro-occipital fissure.
. Removal of the mandibular condyle may give better exposure to the inferior clivus and upper cervical vertebrae
uncovers V2 in the foramen rotundum and the inferior orbital fissure
The cavernous sinus is exposed by thinning the bone of the middle cranial fossa floor anterior to the V2 stump.
The incision line is drawn through the vermillion border, along the filtrum of the lip, extending around the base of the nose (or entering the nostril floor for a better esthetic result) and along the facial nasal groove (In the border of both esthetic units). It then extends infraorbitally 3-4 mm below the cilium to the lateral canthus.