LOBAR COLLAPSE - BASIC CONCEPTS

Lobar colapse is important to diagnose when present, as it may indicat e the presence of a central bronchial obstructing lesion. In some inst ances, its appearance is rather classical and easily diagnosed. In oth er instances, its appearance can challenge even the most experienced r adiologist. In yet other instances, it may be simulated by other disea se processes. This material represents a discussion of some basic conc epts and signs the author considers important in determining whether o r not lobar collapse is present.