Identification of rounded atelectasis in workers exposed to XXXX by contrast helical computed tomography.

@entity1 @entity2 @entity2269 @entity6893 @entity891 @entity153 @entity1355
@entity2269 ( @entity2269 ) is a benign and unusual form of @entity891 that has been described mostly in @entity1355 -exposed workers. This form of atelectasis manifests as a lung nodule and can be confused with @entity153 upon conventional radiologic examination. The objective of the present study was to evaluate the variation in contrast uptake in computed tomography for the identification of @entity1355 -related @entity2269 in Brazil. Between January 1998 and December 2000, high-resolution computed tomography (HRCT) was performed in 1658 @entity1355 -exposed workers. The diagnosis was made in nine @entity1 based on a history of prior @entity1355 exposure, the presence of characteristic (HRCT) findings and lesions unchanged in size over 2 years or more. In three of them the diagnosis was confirmed during surgery. The dynamic contrast enhancement study was modified to evaluate nodules and pulmonary masses. All nine @entity1 with @entity2269 received @entity6893 contrast according to weight. The average enhancement after @entity6893 contrast was infused, reported as Hounsfield units (HU), increased from 62.5+/-9.7 to 125.4+/-20.7 (P < 0.05), with a mean enhancement of 62.5+/-19.7 (range 40 to 89) and with a uniform dense opacification. In conclusion, in this study all @entity1 with @entity2269 showed contrast enhancement with uniform dense opacification. The main clinical implication of this finding is that this procedure does not permit differentiation between @entity2269 and @entity2 .
