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Skin Radiation therapy > oropharynx cancer > Flashcards

oropharynx cancer Flashcards

1
Q

subsides of the ooropharynx

A

tonsil
BOT
Soft palate
posterior pharyngeal wall

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2
Q

most common subsite of ooropharyx cancer

A

tonsil

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3
Q

M:F oropharynx cancer

A

4:1 M:F

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4
Q

age for oropharynx cancer

A

55-65 but younger when associated with HPV

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5
Q

causes of oropharynx cancer

A

smoking
drinking
HPV (becoming more common)
Patients with previous oropharynx have highest incidence of second primary tumours of the upper aerodigestive tract

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6
Q

Oropharynx is ____to oral cavity _____to level of soft palate and _____to upper margin of the epiglottis and is situated between the axis and ___.

A

posterior, inferior, superior between axis and C3

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7
Q

the _____ are on the lateral was of the ooropharynx

A

palatine tonsils

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8
Q

the pharynx links what?

A

the oral and nasal cavities in the Head to the larynx and esophagus in the neck

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9
Q

what LN are most commonly involved in oropharynx cancer

A

cervical LN

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10
Q

lymphatic drainage of the tonsil

A

jugulodigastric and maxillary LN

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11
Q

lymphatic drainage of the soft palate

A

jugulodigastric, retropharyngeal,submaxillary and spinal accessory LN

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12
Q

lymphatic drainage of base of tounge

A

jugulodigastric
retropharyngeal
lower cervical

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13
Q

most common pathology of oropharynx cancer

A

SCC

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14
Q

TNM staging of oropharynx cancer

A

T1 <2CM
T2 2-4CM
T3 >4cm or extension to linuginal surface of the epiglottis
T4a tumur invades larynx, muscle of the lounge, medial pterygoid, hard palate or mandible
T4b-tumpur invades peterygoid muscle, pterygoid spaces , lateral nasopharynx, skull base or encases carotid artery
N1 - 1 ipsilateral LN <3cm
N2-mets in ipsilateral LN 3-6cm
N3-mets >6cm

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15
Q

grades of oropharynx cancer

A 
grade is same for all H&amp;N cancer except nasopharynx 
stage 1 T1 N0 M0
Stage 2 T2 N0 M0
stage 3 T3 N0 M0
T(1-3), N1 M0
Stage 4 T4 any N M0
any T N2,N3 M0
any T any N M1
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16
Q

oropharynx cancers usually present _____.

A

late

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17
Q

route of spread of the tonsils

A 
Palatine-lingual tonsil 
Tonsillar pillars
Soft palate 
Base of tongue 
Pharyngeal wall
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18
Q

route of spread of the soft palate

A

Tonsillar pillars
Pharyngeal walls
Hard palate
Nasopharynx

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19
Q

route of spread of the tounge

A

Ant ⅔ of tongue
Lateral borders
Base and underside of tongue
Floor of mouth

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20
Q

most common site of distant mets

A

lung most common distant site

also: bone brain and cervical LN

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21
Q

most common presentation

A

persistent sore throat and pain during swallowing

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22
Q

presentation of oropharynx not including advanced disease

A

Persistent sore throat and pain during swallowing **most common
Otalgia
Enlargement of cervical nodes

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23
Q

advanced disease presentation for oropharynx cancer

A 
Fetor oris (unpleasant smell) 
Dyspnea 
Dysphagia 
Hoarseness
Dysarthria (difficult or unclear articulation of speech that is otherwise linguistically normal)
Hypersalivation
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24
Q

which sub site of oropharynx cancer has the worst prognosis and why?

A

BOT has worst prognosis because of greater size at diagnosis, more frequent spread to adjacent structures, and higher rate of lymphatic spread

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25
Q

which sub site of oropharynx has the best prognosis?

A

tonsils and soft palate are better

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26
Q

diagnostic methods used for oropharynx cancer

A

biopsy (FNA)
Inspection and palpation
flexible nasopharyngoscopy ( a thin tubs is put up the nose and down the larynx to view any abnormalities)

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27
Q

prognostic indicatos for oropharynx cancer

A

performance status, stage, location of the primary, LN mets, distant mets, HPV (good)

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28
Q

indications for chemo in ooropharynx

A

used concurrently with XRT

used for stage 3 and 4

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29
Q

chemo agents used for oropharynx cancer

A

cisplatinum and 5FU

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30
Q 
What vertebral body is known as the atlas?
A. C1
B.C2
C.C7
D.T3
A

A

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31
Q 
What vertebral body is known as the axis?
A.C1
B.C2
C.C7
D.T3
A

B

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32
Q

surgery for T1 and T2 oropharynx cancer

A

mandibulectomy and neck dissection

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33
Q

surgeries for: Tumours of the lower BOT that involved the valleculae and extend inferiorly to the supraglottic larynx and pyriform sinus

A

partial glossectomy and subtotal supraglottic laryngectomy, or partial laryngopharyngectomy with preservation of voice

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34
Q

requirements for a subtotal supraglottic larygectomy

A

no gross involvement of pharyngoepiglottic fold, preservation of one lingual artery, resection of <80% of the BOT, pulmonary function suitable for supraglottic laryngectomy and medical condition suitable for a major operation

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35
Q

primary treatment for oropharynx cancer

A

XRT

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36
Q

BOT is bounded ant by ______. lat by _______. and _______and inferiorly by _______and ________.

A

anteriorly by circumvallate papillae, laterally by glossopharyngeal sulk and oropharyngeal walls and inferiorly by glossoepiglottic fossaor valecula and the pharyngoepiglottic fold

37
Q

what % BOT patients have mets at presentation?

A

80%

38
Q

treatment for exophytic and surface tumours vs for ulcerative and endophytic tumours

A

XRT alone for exophytic and surface tumours, surgery for ulcerative and endophytic tumours

39
Q

in general what is the best treatment for oropharynx tumours

A

best prognosis when treated with XRT+SX intermediate results for surgery alone and worst results for XRT alone

40
Q

indications for XRT alone BOT

A

small T1and T2 lesions without significant infiltration on surface or exophytic T2-T3 lesions of the glossopharyngeal are controlled with high dose XRT
Large unresectable BOT that cross the midline are given palliative XRT

41
Q

Dose for EBRT for BOT

A

60Gy

42
Q

indications for SX+XRT for BOT

A

best suited for patients with larger tumours that extend beyond the BOT or infiltrate and partially fix the tongue
XRT should be given adjuvantly for T3and T4 tumours of the BOT

43
Q

Borders BOT XRT

A

superior: base of skull and floor of sphenoid sinus to include retropharyngeal LN
anteriorly to include faucial arch and part of the oral tongue
inferiorly include supraglottic larynx
post include posterior cervical triangle

44
Q

spinal cord is shielded to ____Gy in BOT EBRT

A

40-45Gy

45
Q

CTVs for BOT tumours

A

CTV1 i the high risk volume
CTV2 is intermediate risk volume
CTV3 is the low risk volume

46
Q

CTV1 for T1/T2

for T3/T4 BOT cancer

A

in general includes all primary and nodal gross volume (GTV) within 10mm margin
T1/T2 truncate CTV inside hyoid bone
T3/T4 truncate CTV just outside hyoid bone
exclude sift palate if its not involved

47
Q

CTV 2 for BOT cancer

A

(mid risk volume) includes 5mm margin on CTV 1 anteral nodal levels IB, II and V
extends superiorly to the base of the skull
extends inferiorly to the sternoclavicular joint when the neck is treated with IMRT

48
Q

CTV 3 For BOT cancer

A

low risk volume includes contralateral uninvolved nodal disease
excludes contralateral nodal levels V and IB if primary tumour is confined ipsilaterally inf margin extends to 2 cm above sternoclavicular joint superior margin extends to transverse process of C1

49
Q

side effects of XRT in BOT cancer

A

xerostomia occurs in 75% of cases, IMRT reduces this risk a lot 4% per Gy of parotid mean dose

50
Q

how is the palatine arch formed

A

an area between the oral cavity and laryngopharynx is formed by the soft palate and the uvula above and anterior tonsillar pillar and glassopalaitine sulcus laterally and the glossopharyngeal sulcus and the BOT inferiorly

51
Q

the tonsillar fossa and faucial arch lymphatic networjs

A 
laterally grouped into 4-6 lymphatic ducts 
-subdigastric
upper cerviclal
parapharyngeal 
submaxillary
52
Q

tonsillar foss tumours usually involve:

A

are infiltrative and involve the adjacent retromolar trigone =, soft palate, bot

53
Q

tumours of the faucial arch spreading types

A

superficial spreading , exophytic, ulcerative infiltrative and ulcerative and infiltrative are often combined they become extensive involving the adjacent hard palate or buccal mucosa in 20% of patientd

54
Q

how often does LN involvement occur in tonsillar fossa tumours

A

60-70% of cases

55
Q

ln invoelde in tonsillar fossa tumours

A

subdigastric most commonly and also the mid jugular chain and submaxillary LN

56
Q

which oropharynx tumour usually has involved contralateral LN when the ipsilateral LN are +

A

occurs in 10-15% of tonsillar tumours especially when the tumour invades mid line

57
Q

LN progression in oropharynx tumours is usually _____. goes from the _____LN to the _____L;n.

A

is usually systematic,

goes from the upper jugular to the lower cervical Ln

58
Q

most common S&S for tonsillar fossa and faucial arch

A

Sire throat is the most common symtom

59
Q

difficulty swallowing or pain in the ear is symbolic of the involvement of what structur

A

anastomotic -tympanic nerve of Jacobson

60
Q

trismus is symbolic of the involvement of what structure ? is this an early or late symptom

A

it is a late presentation of involvement of master or pterygoid muscle

61
Q

which tumour tends to be more keratinizing and more differentiated : faucial arch or tonsillar fossa?

A

faucial arch

62
Q

prognostic indicators in faucial arch and tonsillar fossa cancers

A
  • stage

- extenson into the BOT = worse survival

63
Q

surgery for T1/T2 vs T3/T4 tonsil tumours

A

T1/T2- tonsillectomy

T3/T4- partial removal of the mandible and ipsilateral neck dissection

64
Q

treatment for T1/T2 tonsil cancer

A

T1/T2 tonsil tumours can be treated with XRT or surgery alone

65
Q

Xrt alone for tonsil cancer

A

T1,T2,T3 tumours can be treated with XRT alone 60-75Gy in 6-8 weeks LN are treated to 50-75Gy and interstitial bratty is used to deliver additional dose of 25-30Gy to the tumour in some cases

66
Q

treatment for T3 and T4 tumours tonsil

A

combo of xrt and Sx
Pre op XRT of 30-50Gy-3/5.5 weeks to the tumour and neck
then radical tonsillectomy and radical neck direction
then 50-60XRT depending on margins and cervical LN involvement
advanced tumours tend to get concurrent t XRT and chemo with cetuximab

67
Q

treatment for T1 tumours of the faucial arch

A

<1cm in diameter is treated with wide surgical resection or XRT alone 60-65Gy

68
Q

T2 tumours of the faucial arch treatment

A

require more extensive procedures including partial mandible resection if there’d bone involvement neck dissection should be done in patients with palpable cervical Ln
T2 cn also be given XRT alone (65-70Gy) or EBRT (50GY) +intrstitial brachy (20-30Gy)

69
Q

T3/T4 tumours of the faudicial arch treatment

A

same as for tonsil
combo of xrt and Sx
Pre op XRT of 30-50Gy-3/5.5 weeks to the tumour and neck
then radical tonsillectomy and radical neck direction
then 50-60XRT depending on margins and cervical LN involvement
advanced tumours tend to get concurrent XRT and chemo with cetuximab

70
Q

dose for XRT alone for T1, T2, T3-T4 cancers of the tonsil and faucial arch

A

T1-65
T2-70
T3-T4-70-75

71
Q 
Doses to cervical LN  For tonsillar fossa and faucial arch
N0
N1
N2a,b
N3`
A

N0 50
N1 66 (reduce fields after 50 Gy)
N2a,b 70 (reduce fields after 50)
N3 70-75 (reduce fields AFTER 50-60)

72
Q

PREOP XRT dose for tonsillar fossa and faucial arch

A

40-45Gy to primary tumour and ipsila1teral or both necks

73
Q

post op XRT for:
negative margins
t3-T4 or N2b, N3 or positive margins

A

50 for negative margins or 50 for T2N0 tumours post op with - margins
50 to primary site and both necks plus boost to selected volume to total dose of 60-66Gy
boost can be an extra 5-10Gywith reduced portals using 12-16Mev electrons or interstitial brachy

74
Q

CTV’s for the tonsil

A 
CTV 1 (high risk) includes primary and nodes (GTV) +10mm margins ant ma2rgin 5mm into the uninvolved m area 
CTV2(mid risk) includes 5margin on CTV1 and nodal levels 1B, 2 and 5
75
Q

subsides of the hypopharynx

A

piriform sinus, posterior cricoid, posterolateral pharynx

76
Q

which is the most common subset of the hypopharynx

A

piriform sinus

77
Q

most common age of hypopharnx cancer

A

50-60

78
Q

most common gender hypopharynx

A

m;f 2;1

79
Q

what are the parts of the ooropharynx

A

BOT, tonsils, soft palate and post pharyngeal wall

80
Q

what is most common risk for ooropharynx in older pts vs younger pts

A

smoking and drinking in older pts

HPV in younger pts

81
Q

CTV expansion tonsil vs BOT vs Soft palate

A

GTV +1-1.5cm for tonsil
GTV +2cm for BOT
GTV +1-1.5cm for Soft palate

82
Q

what subsite has lowest incidence of + LN at dx?

A

the soft palate

83
Q

what can increase a patients risk of secondary H&N cancer

A

drinking +14 alcoholic drinks/ week after the end of tx

84
Q

what subsited has the highsest risk of LN + at dx

A

Base of tongue

85
Q

what is first symptom, sign ?

A

symptom: pain radiating to the ear
Sign: neck mass

86
Q

what subsite is diagnosed at the latest stage? why?

A

BOT

because other subsites a neck mass can be seen evidently on examination, BOT can notg be visualized directly

87
Q

which oropharynx subsite has good and poor prognosis?

A

BOT= worse, these tumours are largr and diagnosed later and soft palate and tonsil have better prognosis

88
Q

prognosis in younger or older pts = better?

A

younger- associated with HPV is better

89
Q

what LN are most commonly in the TX field?

A

RP

Skin Radiation therapy (40 decks)

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