carcinoma maxillary sinus management radiation oncology
TRANSCRIPT
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CARCINOMA MAXILLAMANAGEMENT
Dr. Paul George Radiation Oncology Regional Cancer center
Trivandrum
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NASAL CAVITY & PARANASAL SINUSES
Epidemiology
Incidence 0.5-1/100,000 per year0.2-0.8% of all malignancies3% of upper aerodigestive tract neoplsm
5th-6thdecadeWhite raceM:F=2:1 – 4:1
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SQUAMOUS CELL CARCINOMA
Most common histological type70% maxillary sinusMale predominanceOlder age groupEnviornmental exposure: leather tanner, nickel refinery, thorotrast
Adenoca(10-20%), adenocystic ca(<10%), sinonasal melanoma(<4%), esthesioneuroblastoma, sinonasal undifferentiated carcinoma, lymphoma,sarcoma , plasmacytoma
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How to Proceed
1.HISTORY & Physical exam2.Radiography (CT, MRI)complete head & neck.3.BIOPSY4.Chest imaging5.dental/prosthetic consultation as indicated
STAGING
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HISTORY & PHYSICAL EXAMINATION
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Anatomy of maxillary antrum
• Anterior : soft tissue of face .
• Posterolateral : ITF , pterygopalatine F
• Superior : Inferior orbital plate .
• Inferiorly : hard palate ,superior alveolar ridge
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PATTERN OF TUMOUR SPREAD
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Patterns of tumour spreadAnteriorly: cheek, skinPosteriorly: pterygopalatine fossa, infra temporal fossa, temporal bone middle cranial fossaMedially: nasal cavity,NLDLaterally: cheek, skinSuperiorly: orbit, ethmoid sinusesInferiorly: palate, buccal sulcus
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CLINICAL PRESENTATION• Nasal findings:(50%) obstruction, epistaxis,
rhinorrhea,discharge,extension into nasal cavity
• Oral symptoms:(25-35%) pain, trismus, alveolar ridge fullness, erosion
• Ocular findings:(25%) epiphora, diplopia, proptosis
• Facial signs: paresthesias, facial asymmetry, cheek swelling
• Auditory symptoms: hearing loss (OME)• Neurological: cranial nerve deficits II,III,IV.V1,V2,VI• 10% nodal• Distant mets: rare
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H & P examination• The sinonasal, ocular, and neurologic systems
should be studied in detail• Ant & post rhinoscopy• Nasal endoscopy
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RADIOLOGICAL EXAMINATION
Radiographic studies are essential as the fullextent of a sinonasal neoplasm cannot beestablished even with modern fiberoptictechnology. Both CT& MRI are the effective ways todelineate the extent of tumor extracranially andintracranially.
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Computed Tomography
Bone erosionKey areas include the bony orbital walls,cribiform plate, fovea ethmoidalis, posterior wallof the maxillary sinus, pterygopalatine fossa, thesphenoid sinus, and the posterior table of thefrontal sinus.85% accuracy
Difficultperiorbital involvementDifficult to differentiate between: Tumor vs. inflammationvs. secretions
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MRI• 94% accuracy
• Inflammatory tissue & secretions: intense T2
• Tumor: intermediate T1 & T2, Enhancement with Gadolinium
• MRI is excellent for determining perineural spread, involvement of the dura, or involvement intracranially.
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BIOPSY
Transnasalmedial wall of maxilla is the preferred routeNeedle biopsy is sufficient
Biopsy via Caldwell-Luc approach (canine fossa puncture) is not recommended because of the potential to seed the gingivobuccal sulcus andcheek skin with tumor.
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STAGING
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Ohngren’s Line
a line that is drawn from the angle of mandible to the medial canthus.Ohngren indicated that tumors that presented above this line (suprastructure); both superiorly and posteriorly, tended to have a worse prognosis
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MANAGEMENT
1.SURGERY2.RADIOTHERAPY3.CHEMOTHERAPY:VERY LIMITED ROLE
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SURGERY
Surgical approaches:• Endoscopic• Lateral rhinotomy• Transoral/transpalatal• Weber fergussen• Midfacial degloving• Combined craniofacial approach
Extent of resection• Medial maxillectomy• Inferior maxillectomy• Total maxillectomy
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Weber fergussen approach tumors involving the maxilla extending superiorly to the infraorbital nerve and into the orbit.Wide access to all areas of the maxilla and orbital floor.
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Midfacial Degloving
Nasal cavity tumors withbilateral involvementMost suited for inferiorlylocated tumors.Subperichondrial plane of nasal septum
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Inferior medial maxillectomy
Medial maxillectomy Radical maxillectomy
with exentration
Cranio-facial resection
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Surgical procedures The goal of surgery for nasal cavity and paranasal sinus
tumors is to achieve en bloc resection of all involved bone and soft tissue with clear margins while maximizing the cosmetic and functional outcome.
Limited nasal cavity lesions may be resected with medial maxillectomy.
Ethmoid lesions usually require medial maxillectomy and en bloc ethmoidectomy.
combined craniofacial procedure for lesions involving the inferior surface of the cribriform plate ,the roof of the ethmoid & frontal sinus.
Multidisciplinary skull base approach has improved the outcome
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UNRESECTABILITY
Unresectable tumors:• Superior extension: frontal lobes• Lateral extension: cavernous sinus• Posterior extension: prevertebral fascia• Bilateral optic nerve involvement• Distant Metastasis
Reconstruction after surgery is done with microvascular free flap & maxillofacial obturatorprosthesis
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RADIOTHERAPY Addition of RT to surgery improve 5-years survival (44%) when compared to
RT alone (23%) or surgery alone.
Indications:
Definitive :medically inoperable or who refuse radical surgery or early lesions
Adjuant:
Palliative:
Pre- and postoperative radiation may result in similar control rates.
But post-operative RT preferred:
Preoperative radiation increases the infection rate and the risk of postoperative wound complications.
Preoperative radiation may obscure the initial extent of disease=surgery can not
remove the microscopic extensions of the tumor.
• Postoperative radiation therapy is started 4 to 6 weeks after surgery.
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RADIOTHERAPY TECNIQUES
1.CONVENTIONAL 2D2.CONFORMAL 3D3.IMRT
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2D CONVENTIONAL: 3field tecnique
Patient lies in a supine cast with the head in neutral position.Tongue bite is used to depress tongue & lower alveolus away
from the target volume.
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ANTEROR FIELD
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LATERAL FIELD
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• Field Margins: a three-field technique for maxillary antrum: 1 anterior and 2 lateral
fields.Anterior field:superior border: above the crista galli to encompass the ethmoids.
in the absence of orbital invasion, at the lower edge of the cornea to cover the orbital floor.
inferior border: 1 cm below the floor of the sinus.medial border: 1 to 2 cm (or more if necessary) across the midline cover contralateral ethmoidal extension. lateral border: 1 cm beyond the apex of the sinus or falling off the
skin.
Lateral fields:superior border: follows the floor of anterior cranial fossa.anterior border: behind the lat canthus parallel to the slope of face.posterior border: covers the pterygoid plates.
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Anterior field:When ther is no gross involvement of the orbit, the cornea, lens & lacrimal gland are shieldedfrom the anterior fieldIf there is disease in the orbit, cornea is sparedby cutting out the cast and treating with the eyes openLateral field:It is angled 5-10 degree posteriorly so that the exit beam avoids the opposite eyeOptic chiasma & hypothalamus are shielded from the lateral field
Anterior beam is weighed as 2:1 to that of lateral beamDose prescription:65Gy/32# or 55Gy/20#
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ISODOSE DISTRIBUTION
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3D CONFORMAL
4 Field 1. Anteror 2. two lateral portal3. Intraorbital electron portal to make up the dose to post nasal
cavity, ethmoid sinus & medial orbit
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CT SIM
A CT scan is performed with 3 mm slices from2cm superior to the superior orbital ridge to thehyoid bone (but extended to include the lowneck if neck nodes are to be treated).
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TARGET VOLUME DELINEATIONThe CTV should encompass• all initial sites of disease(presurgery GTV), • The mucosa of adjacent compartments of the sinonasal
complex and• a 10 mm margin at least from initial sites of GTV where no good
bony barrier to invasion exists(e.g. masticator space, cribriform plate and infraorbital fissure) • Bony orbit if involved
For most tumours, the CTV will include the ipsilateral maxillarysinus and bilateral nasal cavity and the ethmoid sinuses.
The CTV is expanded isotropically (usually by 3–5 mm)to form the PTV
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Where a craniofacial excision has been carried out, the CTV should extend 10 mm superior to the cribriform plate or 10 mm superior to Initial sites of disease, whichever is greater
If the primary was close to or invading the nasopharynx, the adjacent Ipsilateral retropharyngeal nodes should be included in the CTV.
When cervical node radiotherapy is indicated, the intraparotid nodes, level Ib and superior level II nodes can be included in the CTV.
Elective neck nodal radiation is not recommended
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ORGAN AT RISK
include the 1.lenses,2. lacrimal glands (in the superolateral orbit and upper eyelid), 3.optic nerves and chiasm, 4.spinal cord, 5.brainstem and 6.pituitary gland
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OAR & possible complications of RT
• Lens <10 Gy (cataracts)• Lacrimal gland <30–40 Gy (dry eye syndrome) • Retina <45 Gy (blindness)• Optic chiasm and nerves <54 Gy at standard fractionation.
(Optic neuropathy)
• Brain <60 Gy (necrosis)• Mandible <60 Gy (osteoradionecrosis)• Parotid mean dose <26 Gy (xerostomia) • Pituitary and hypothalamus mean dose <40 Gy.
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IMRT
A non-coplanar arrangement of three to five sagittal midline beams with right and left lateral beams avoids entry or exit ofbeams through the eyes andprovides a uniform dose distribution
IMRT has been shown to be useful inreducing long-term toxicity by reducing the dose to salivary glands,temporal lobes, auditory structures, and optic structures
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IMRT
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Complications of RT
Acute:mucositis, skin erythema, nasal dryness, Xerostomia
Late: xerostomia, chronic keratitis and iritis, optic pathway injury , osteoradionecrosis,cataracts, radiation induced hypopituitarism
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Dose fractionation
Definitive RT: 70Gy , 2G/# over 7 wksAdjuvant60 Gy in 30 daily fractions given in 6 weeks.66 Gy in 33 daily fractions if possible wherethere is residual disease.Palliative36 Gy in 6 fractions of 6 Gy treating once weekly.
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Treatment delivery and patient care
Patients are seen weekly during treatment in a multidisciplinary clinic.
• Exercises to reduce trismus• Prophylactic feeding tubes should be considered • ophthalmic review .Lubricating eye ointments• If there is a pre-existing facial nerve palsy, the eyelid
should be taped shut at night to avoid a dry eye.• Pituitary function tests should be carried out annually
during follow-up to evaluate late radiotherapy effects to the pituitary gland.
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Role of chemotherapy
• Neoadjuvant chemotherapy is sometimes offered in order to reduce tumor volume, which may permit removal of tumor with a less morbid resection or facilitate radiotherapy planning if shrinkage pulls away tumor from critical structures.
• chemotherapy may be given concurrent with radiotherapy in the management of inoperable tumors on the basis of improved results in more frequent head and neck carcinomas.
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FOLLOW UP
H&P, labs every 3 months for first year, Every 4 months for second year,Every 6 months for third year, then annually. Imaging of the H&N at 3 months post treatment, then as indicated
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STAGEWISE MANAGEMENT OF CARCINOMA MAXILLA
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Stage I / II (T1-T2, N0)
SINGLE MODALITY TREATMENT
DEFINITIVE RT/SURGERY
• If perineural invasion by the tumor, Adjuvant RT (±Chemo)
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LOCALLY ADVANCED
T3-T4a, N0( resectable)
SURGERY POSTOP RT
If margins are positive, ChemoRT tothe primary
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Node + Stage
SURGERY WITH NECK DISSECTION POSTOP RT
If margins positive or ECE, ChemoRT
Elective neck nodal irradaition is not routinely recommended
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VERY LOCALLY ADVANCED
T4b , unresectable
PS 0,1 : RADICAL CHEMORT/ Induction chemofollowed by chemoRTPS2: RADICAL RTPS3: PALLIATION
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Locoregional Reurrence/residual:
Salvage surgery/Reirradiation +/_chemo/clinicaltrial
Distant mets: palliative chemo/Best supportivecare
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PROGNOSIS
Even with multimodality treatment average 5year median survival of carcinoma maxilla is only 35-45%
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CLINICAL SCENARIO
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INDIRA 58/FHOUSE WIFEREPORTED INB CLINIC 3/6/13ComplaintsLeft Nasal discharge 15mnthsLeft nasal block 6monthsECOG PS 1 GC;good
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INVESTIGATIONS
Trans nasal biosy left maxilla:Poorly diff carcinoma
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CA MAXILLAStaging…….? Management…………….?
cT2N0M0
RT/SURGERY….?ADJUANT Rx…?
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Cacinoma maxilla: cT2N0M0 MANAGEMENTSUBTOTAL MAXILLECTOMY on 21/08/13HPE:Non keratinising scc with bone erosion close margin <0.1cm from lateral marginOther margins free
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Postop RT 55Gy/20#
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Thank you…….
Dr. Paul George