The term "sinusitis" means an inflammation of one or more of the sinus cavities. If one or more of the paired paranasal sinuses or air cavities becomes inflamed, it leads to an infection called sinusitis. Medullary sinuses (space between the lymphatic cortex and efferent lymphatic drainage).Trabecular sinuses (space around the invaginations of the lymphatic capsule).Subcapsular sinus (space between the lymph node and capsule).Coronary sinus (subdivisions of the pericardium).Costodiaphragmatic recess (lung/diaphragm sinus, also known as phrenicocostal sinus).If left untreated, infections occurring in the sinus cavities can affect the chest and lungs. It is however distinct from a fistula, which is a tract connecting two epithelial surfaces.
The word "sinusitis" is used to indicate that one or more of the membrane linings found in the sinus cavities has become inflamed or infected. In anatomy, the term is used in various contexts. Sinus is Latin for "bay", "pocket", "curve", or "bosom".
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