A collection of fluid and cells in the tissues of the lung; visible on a chest x-ray in people with pulmonary TB disease.

A collection of inflammatory cells within a body tissue; for example, in the lung. Pulmonary infiltrates are visible on chest x-rays in pneumonia and in some forms of vasculitis.

White blood cells accumulating on the cornea to fight infection. May occur from contact lens overwear, even in the absence of infection.