Ct analysis of distant metastases many autopsy

Ct analysis of distant metastases many autopsy
series have demonstrated an overall prevalence of distant metastases
in patients with end-stage lung cancer as high as 93%.
key sites concerned embody liver ( 33% to 40% ), adrenal ( 18%
to 38% ), brain ( 15% to 43% ), bone ( 19% to 33% ), kidney
( 16% to 23% ), and abdominal lymph nodes ( 29% ). 182–184
autopsy studies performed within the immediate postoperative
episode further together report of abdominal exploratory surgery
prior to thoracotomy for bronchogenic carcinoma have shown
lower prevalences of metastatic spread to individual organs ( liver
7% to 14%, adrenal 1% to 9%, brain 4%, bone 1% to 5%,
kidney 0% to 4%, abdominal lymph nodes 5% to 8% ).
nonetheless, the overall prevalence of occult metastatic
disease was fairly high ( 18% to 36% ) within these pre-ct-era
studies. 185–188 one among these studies found that extrathoracic
metastases were additional common among men with adenocarcinoma
than among those with squamous cell carcinoma. 185
a additional recent autopsy report too found a moderately high
frequency ( 19% of 103 18% ) of distant metastases in patients
dying within the perioperative episode once lung cancer
resection. 186
out of 95 patients with newly diagnosed nsclc and
n0 disease at ct, one report demonstrated ct proof of
extrathoracic tumor spread in twenty four of 95 ( 25% ) patients. these
included metastases to brain ( ten ), bone ( eight ), liver ( half-dozen ), adrenal
( half-dozen ), and soft tissue ( a pair of ) ( a few patients had involvement at more
than one website ). 189 an extra, prospective study of 146 patients
with potentially resectable nsclc ( clinical t3 or less
and n2 or less ) 190 revealed distant metastatic disease in thirty of
146 ( 30% ) patients. these metastases were detected by chest or
abdominal ct, brain ct, abdominal ultrasonography, and/or
bone scan, and presumably every finding was proved. the lesions
were distributed as follows : 13% bone, 13% brain, twelve. 3%
liver, seven. 5% adrenal, one. 4% kidney, and one. 4% subdiaphragmatic
nodules. ( in seventeen patients the metastases were “multiorganic. ” )
the authors indicated that patients with nonsquamous cell
carcinomas ( adenocarcinoma or massive cell carcinoma ) were at
considerably bigger risk on behalf of metastases outside the thorax than
those with squamous cell cancer ( p but zero. five ). no relationship
was detected between the tn stage and also the existence
of metastases during adenocarcinoma and huge cell adenocarcinoma.
there was, but, an association between advanced n stage
( iiia ) and presence of extrathoracic metastases for squamous
cell cancers. none of the stage i intrathoracic squamous cell
cancers had metastases. several patients with metastases to brain,
bone, liver, and adrenal were asymptomatic. therefore these authors
advocated the routine performance of preoperative higher abdominal
ct and/or ultrasonography during all patients except those
with asymptomatic stage i squamous cell cancers. brain cts
were advised for all patients with adenocarcinoma and huge
cell carcinoma, further as for those with squamous cell cancer
and neurologic symptoms. bone scanning was advised only
in those patients with clinical and laboratory indications of possible
bone involvement by metastatic disease.
a study by quint et al. 191 found 21% overall prevalence
of distant metastases in 348 patients with newly diagnosed
nsclc. in 56% of patients with distant metastases, the lesions
were detected using chest or abdominal ct. brain, bone, liver,
and adrenal glands were the foremost common sites of disease, in
decreasing order ( fig. twenty six. twenty six ). brain metastases typically occurred
as an isolated finding. on the opposite hand, isolated liver metastases
were uncommon, and also therefore the incremental yield
of abdominal ct over chest ct was quite little. therefore these
authors concluded that abdominal ct doesn't seem to be
an effective methodology of screening on behalf of metastases if chest ct has
been performed. a recent report that examined clinical predictors
of metastatic disease to the brain from nsclc found that
the chance of brain metastases correlated with size of the
primary tumor, cell type, and that intrathoracic lymph node stage,
other then not with gender, patient age, or central versus peripheral
location of the tumor ; adenocarcinomas and undifferentiated
cell types were additional commonly related to tumor spread
to the brain compared to squamous cell carcinoma. 192
despite the high prevalence of adrenal metastases from bronchogenic
carcinoma, approximately 2 thirds of adrenal masses
in patients with nsclc truly represent adenomas, instead of
metastases. 193 adrenal adenomas are found during about 3% to 9%
of autopsies on adults, 194, 195 and approximately 1% of patients
undergoing abdominal ct have benign incidental adrenal masses
larger than one cm. 196 during a study of 546 patients with lung cancer,
22 of 546 ( 4% ) patients had one or additional adrenal masses on preoperative
ct. 197 seventeen of twenty-two had proof of adrenal
standing via either biopsy or follow-up. a total of five of those seventeen were
malignant ( 29% ) and twelve of seventeen were benign ( 71% ). these authors
reported that adenomas were well defined and low during attenuation
and showed a swish, high attenuation rim and that involvement of
just a part of gland. features of metastases included a coffee attenuation,
massive ( larger than five cm ) mass while not a rim and that irregular,
mixed attenuation. 197 unfortunately, there's significant overlap
within the appearance of adrenal metastases and benign adenomas on
routine, contrast-enhanced ct. so detection of an adrenal
mass on such a study needs additional workup. unenhanced ct
densitometry will be used to distinguish between lipid-rich adenomas
and nonadenomatous masses. employing a cutoff of ten hu,
an accuracy of over 90% will be accomplished for the diagnosis
of a lipid-rich adenoma. 198, 199 during addition, considerable work has
recently been done using dedicated adrenal ct with a mixture
of noncontrast, postcontrast and delayed enhanced images
in evaluating wash-out characteristics during adrenal masses. 200–203
using these techniques, it is typically doable definitively to diagnose
benign adrenal cortical adenomas while not biopsy. if these
imaging studies counsel the presence of a metastasis, biopsy proof
is usually needed before altering therapy.