In physics and chemistry, effusion is the process in which a gas escapes from a container through a hole of diameter considerably smaller than the mean...

A pleural effusion is accumulation of excessive fluid in the pleural space, the potential space that surrounds each lung. Under normal conditions, pleural...

A pericardial effusion is an abnormal accumulation of fluid in the pericardial cavity. The pericardium is a two-part membrane surrounding the heart: the...

Knee effusion, informally known as water on the knee, occurs when excess synovial fluid accumulates in or around the knee joint. It has many common causes...

A joint effusion is the presence of increased intra-articular fluid. It may affect any joint. Commonly it involves the knee (see knee effusion). The approach...

three types of parapneumonic effusions: uncomplicated effusions, complicated effusions, and empyema. Uncomplicated effusions generally respond well to appropriate...

a fever may also be present. The other main type is otitis media with effusion (OME), typically not associated with symptoms, although occasionally a...

effusion Pleural effusion Joint effusion Subdural Effusion Mastoid Effusion Knee effusion Sometimes called "hydrops" Effusive eruption, an effusion of...

subpulmonic effusion is excess fluid that collects at the base of the lung, in the space between the pleura and diaphragm. It is a type of pleural effusion in...

Subdural effusion refers to an effusion in the subdural space, usually of cerebrospinal fluid.[citation needed] It is sometimes treated with surgery. Cerebrospinal...