of mediastinal masses. Ultrasound has played a very minor role in imaging masses in this location, being utilized only in very anterior lesions or those immediately adjacent to the chest wall.In lower mediastinal masses, however, ultrasound can be superior to CT, both in differentiating cystic from solid lesions and in demonstrating diaphragmatic relationships. In the following case, ultrasound played a major role in the diagnosis of a bronchogenic cyst of the lower middle mediastinum.
FIGURE 1. A, 8:Posteroanterior and lateral chest films revealing a well-circumscribed mass behind the right heart border in the middle rnediastinum.
The brain imaging properties of 99mTc glucoheptonate, 99mTc pertechnetate, and 99mTc DPTA are compared. Results demonstrate that optimum images are obtained at 90, 180, and 180 min., for 99mTc GH, 99mTc DTPA, and 99mTc perterchnetate, respectively. The former two images are not affected by prior bone imaging with 99mTc pyrophosphate, while 99mTc pertechnetate images are adversely affected. 99mTc glucoheptonate appears to be the superior agent for brain imaging, followed by 99mTc DTPA and 99mTc pertechnetate.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.