Chest Radiology > Pathology > Atelectasis > General. Atelectasis is collapse or incomplete expansion of the lung or part of the lung. This is one of the most common findings on a chest x-ray. It is most often caused by an endobronchial lesion, such as mucus plug or tumor.
A Labradoodle, a crossbreed between a poodle and a retriever. A crossbreed or crossbred usually refers to an organism with purebred parents of two different breeds, varieties, or populations.
*Three-way cross hybrid â offspring from a cross between a single cross hybrid and an inbred line. *Triple cross hybrid-offspring resulting from the crossing of two different three-way cross hybrids. *Population hybrid â offspring resulting from the crossing of plants or animals in a population with another population. For instance, a cross between difference races. Word origin: L hybrida, hibrida, a crossbred animal. Related forms: hybridize or hybridise (verb), hybridization (noun).