Analysis of mediastinal lymph node metastases
( n2/n3 disease ) the accuracy of standard radiography
in diagnosing mediastinal lymph node metastases has
usually been quite low thanks to poor sensitivity ( 6% to
81% ). 107, 142, 153, 154, 161–164 disparate results are reported
relating to the accuracy of ct during this setting ( figs. twenty six. fourteen and
twenty six. 22 to twenty six. 25 ; table twenty six. a pair of ). several studies have found fairly high
sensitivity for ct ( 85% ) 93, 108, 139, 152, 154, 156, 161, 165–167 and
high npv ( 85% ; table twenty six. a pair of ). 156, 157, 160, 166–170 others have
found high specificity ( 85% ). 105, 142, 155–157, 162, 166, 167, 169–174
on the opposite hand, a number of the a lot of recent studies have
shown low accuracy, ensuing from each poor sensitivity and
poor specificity. 88, 106, 159, 175–177 low sensitivity in a few studies
was attributed to the high frequency of microscopic metastases
inside normal-sized nodes. 105 low specificity arose from
the frequent occurrence of enlarged, hyperplastic nodes, particularly
in patients with postobstructive pneumonitis. 159 dales
et al. 178 performed a metaanalysis of ct accuracy in staging
mediastinal lymph nodes in nsclc using information from studies
printed between 1980 and 1988. pooled information revealed accuracy,
sensitivity, and specificity figures that were approximately
80% every. they found no significant differences between the
results from studies performed using fourth-generation versus
third-/second-generation ct scanners. moreover, there's no
information to counsel that the helical or spiral scanners ( either single
or multidetector ) improve ct accuracy during this setting.
results inside a number of the individual studies quoted previously
varied per the dimensions and morphologic criteria
used for diagnosing metastatic disease to mediastinal lymph
nodes. for instance, seely et al. 169 found that sensitivity increased
and specificity decreased if long-axis diameter measurements
were used rather than short-axis measurements or
if adjacent nodal stations were thought of along instead
of considering every nodal station alone. purchase et al. 156 found
maximal sensitivity when individual size thresholds were used
for every individual nodal station, instead of using an identical
10-mm size cutoff. in contrast, the information of ikezoe et al. 157
showed slightly higher sensitivity, albeit considerably worse
specificity and accuracy, using an identical 10-mm threshold
instead of 2 separate criteria ( thirteen mm for nodes within the subcarinal,
precarinal, and tracheobronchial regions and ten mm
for nodes in alternative regions ). specificity within the study of buy
et al. 156 was maximized when the criterion for nodal abnormality
was defined as follows : the short axis of the bigst mediastinal
node within the lymphatic drainage territory of the cancer
was larger than or equal to ten mm and also the distinction between
this node and also the largest node in the opposite territories was
larger than five mm. per the investigation of ratto et
al., 167 specificity increased dramatically if nodes ten to fifteen mm
briefly-axis diameter were thought of indeterminate and excluded
from analysis. though, 36% ( 44 of 123 ) of patients
fell into this class, limiting the usefulness of this criterion.
these authors conjointly found increased specificity if the criterion
for abnormal nodes was modified to embrace nodes ten to twenty
mm briefly axis diameter with central necrosis and/or a discontinuous
capsule.
in a few studies, ct accuracy conjointly looked as if it would rely upon
the precise anatomic location inside the mediastinum being
analyzed. within the study of mcloud et al., 159 sensitivity of ct
using one size criterion ( 10-mm short-axis diameter ) varied
for individual nodal stations, ranging from 17% to 83%.
highest sensitivity was found in a veryts regions 4r and five, and
lowest in seven, 4l, 10r, 10l. specificity ranged from 72% to
94%, being highest in 10l and lowest in 10r. platt et al. 151
compared staging of right and left lung tumors. although
prior reports have shown that ct is a lot of correct in evaluating
right-sided mediastinal lymph nodes, 134, 179 platt et al. 151
found no statistically significant distinction in staging accuracy
between left and right lung cancers. this can be most likely a results of
involvement of subcarinal and contralateral mediastinal lymph
nodes, that are present a lot of usually in left lung cancers as
compared to right-sided lesions. 180
there have been conjointly a few reported differences when the data
were broken down per cell sort of the tumor. ikezoe
et al. 157 found that sensitivity for cases of adenocarcinoma
( 61% ) was under that for squamous cell carcinoma ( 86% ),
other then specificity for these 2 teams was virtually identical ( 93%
to 94% ). there was a rised variety of false-negative
cases for adenocarcinomas, as compared to squamous cell carcinomas
in each this study and 2 others 105, 147 ; the authors
postulated that this most likely indicated the next frequency of
microscopic metastases in a verydenocarcinomas. on the opposite
hand, ratto et al. 167 reported no distinction in staging accuracy
between squamous cell carcinoma and adenocarcinoma.
when calculated on a nodal station-by-station basis, results
in a few studies varied per whether or not or not adjacent
nodal stations were included within the analysis. as an example, inclusion
of adjacent nodal stations led to a rise in sensitivity
and a decrease in specificity in one investigation. 169 though, it
is vital to note that the clinical usefulness of a staging modality
doesn't rely upon correct detection of disease in a veryny
individual node or nodal cluster, other then rather on correct detection
of mediastinal nodal malignancy within the individual patient, either
ipsilateral or contralateral to the neoplasm. moreover, many authors
have reported increased sensitivity in mediastinal lymph
node analysis when calculated on a patient-by-patient basis
instead of on a nodal station-by-station basis. 143, 159, 169
there are several potential reasons for the totally different reported
ct accuracies among studies in detecting mediastinal
metastases. differences in patient populations and prevalence
of mediastinal nodal disease would affect ct accuracy. some
investigations included all patients with known or suspected
( n2/n3 disease ) the accuracy of standard radiography
in diagnosing mediastinal lymph node metastases has
usually been quite low thanks to poor sensitivity ( 6% to
81% ). 107, 142, 153, 154, 161–164 disparate results are reported
relating to the accuracy of ct during this setting ( figs. twenty six. fourteen and
twenty six. 22 to twenty six. 25 ; table twenty six. a pair of ). several studies have found fairly high
sensitivity for ct ( 85% ) 93, 108, 139, 152, 154, 156, 161, 165–167 and
high npv ( 85% ; table twenty six. a pair of ). 156, 157, 160, 166–170 others have
found high specificity ( 85% ). 105, 142, 155–157, 162, 166, 167, 169–174
on the opposite hand, a number of the a lot of recent studies have
shown low accuracy, ensuing from each poor sensitivity and
poor specificity. 88, 106, 159, 175–177 low sensitivity in a few studies
was attributed to the high frequency of microscopic metastases
inside normal-sized nodes. 105 low specificity arose from
the frequent occurrence of enlarged, hyperplastic nodes, particularly
in patients with postobstructive pneumonitis. 159 dales
et al. 178 performed a metaanalysis of ct accuracy in staging
mediastinal lymph nodes in nsclc using information from studies
printed between 1980 and 1988. pooled information revealed accuracy,
sensitivity, and specificity figures that were approximately
80% every. they found no significant differences between the
results from studies performed using fourth-generation versus
third-/second-generation ct scanners. moreover, there's no
information to counsel that the helical or spiral scanners ( either single
or multidetector ) improve ct accuracy during this setting.
results inside a number of the individual studies quoted previously
varied per the dimensions and morphologic criteria
used for diagnosing metastatic disease to mediastinal lymph
nodes. for instance, seely et al. 169 found that sensitivity increased
and specificity decreased if long-axis diameter measurements
were used rather than short-axis measurements or
if adjacent nodal stations were thought of along instead
of considering every nodal station alone. purchase et al. 156 found
maximal sensitivity when individual size thresholds were used
for every individual nodal station, instead of using an identical
10-mm size cutoff. in contrast, the information of ikezoe et al. 157
showed slightly higher sensitivity, albeit considerably worse
specificity and accuracy, using an identical 10-mm threshold
instead of 2 separate criteria ( thirteen mm for nodes within the subcarinal,
precarinal, and tracheobronchial regions and ten mm
for nodes in alternative regions ). specificity within the study of buy
et al. 156 was maximized when the criterion for nodal abnormality
was defined as follows : the short axis of the bigst mediastinal
node within the lymphatic drainage territory of the cancer
was larger than or equal to ten mm and also the distinction between
this node and also the largest node in the opposite territories was
larger than five mm. per the investigation of ratto et
al., 167 specificity increased dramatically if nodes ten to fifteen mm
briefly-axis diameter were thought of indeterminate and excluded
from analysis. though, 36% ( 44 of 123 ) of patients
fell into this class, limiting the usefulness of this criterion.
these authors conjointly found increased specificity if the criterion
for abnormal nodes was modified to embrace nodes ten to twenty
mm briefly axis diameter with central necrosis and/or a discontinuous
capsule.
in a few studies, ct accuracy conjointly looked as if it would rely upon
the precise anatomic location inside the mediastinum being
analyzed. within the study of mcloud et al., 159 sensitivity of ct
using one size criterion ( 10-mm short-axis diameter ) varied
for individual nodal stations, ranging from 17% to 83%.
highest sensitivity was found in a veryts regions 4r and five, and
lowest in seven, 4l, 10r, 10l. specificity ranged from 72% to
94%, being highest in 10l and lowest in 10r. platt et al. 151
compared staging of right and left lung tumors. although
prior reports have shown that ct is a lot of correct in evaluating
right-sided mediastinal lymph nodes, 134, 179 platt et al. 151
found no statistically significant distinction in staging accuracy
between left and right lung cancers. this can be most likely a results of
involvement of subcarinal and contralateral mediastinal lymph
nodes, that are present a lot of usually in left lung cancers as
compared to right-sided lesions. 180
there have been conjointly a few reported differences when the data
were broken down per cell sort of the tumor. ikezoe
et al. 157 found that sensitivity for cases of adenocarcinoma
( 61% ) was under that for squamous cell carcinoma ( 86% ),
other then specificity for these 2 teams was virtually identical ( 93%
to 94% ). there was a rised variety of false-negative
cases for adenocarcinomas, as compared to squamous cell carcinomas
in each this study and 2 others 105, 147 ; the authors
postulated that this most likely indicated the next frequency of
microscopic metastases in a verydenocarcinomas. on the opposite
hand, ratto et al. 167 reported no distinction in staging accuracy
between squamous cell carcinoma and adenocarcinoma.
when calculated on a nodal station-by-station basis, results
in a few studies varied per whether or not or not adjacent
nodal stations were included within the analysis. as an example, inclusion
of adjacent nodal stations led to a rise in sensitivity
and a decrease in specificity in one investigation. 169 though, it
is vital to note that the clinical usefulness of a staging modality
doesn't rely upon correct detection of disease in a veryny
individual node or nodal cluster, other then rather on correct detection
of mediastinal nodal malignancy within the individual patient, either
ipsilateral or contralateral to the neoplasm. moreover, many authors
have reported increased sensitivity in mediastinal lymph
node analysis when calculated on a patient-by-patient basis
instead of on a nodal station-by-station basis. 143, 159, 169
there are several potential reasons for the totally different reported
ct accuracies among studies in detecting mediastinal
metastases. differences in patient populations and prevalence
of mediastinal nodal disease would affect ct accuracy. some
investigations included all patients with known or suspected
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