Monocytopenia with susceptibility to infections is a rare, genetic, primary immunodeficiency disorder characterized by profound circulating monocytopenia, B- and NK-cell lymphopenia and severe dentritic cell decrease, which manifests clinically with disseminated mycobacterial and viral infections, as well as opportunistic fungal and parasitic infections and frequent pulmonary alveolar proteinosis. Predisposition to developping myeloid neoplasms is associated.

Aortic dilatation refers to a dimension that is greater than the 95th percentile for the normal person age, sex and body size. In contrast, an aneurysm is defined as a localized dilation of the aorta that is more than 150 percent of predicted (ratio of observed to expected diameter 1.5 or more). Aneurysm should be distinguished from ectasia, which represents a diffuse dilation of the aorta less than 50 percent of normal aorta diameter.