Sinusitis is an inflammation of the sinuses. It is often caused by bacterial (germ) infection. Sometimes, viruses and fungi (molds) cause it. People with weak immune systems are more likely to develop bacterial or fungal sinus infection. Some people with allergies can have allergic fungal sinus infection. Acute sinus infection lasts three to eight weeks. A sinus infection lasting longer than eight weeks is considered chronic.
Define Upper stage. Upper stage synonyms, Upper stage pronunciation, Upper stage translation, English dictionary definition of Upper stage. n. A rocket composed of two or more propulsion units that fire in succession. Also called step rocket . Noun 1. multistage rocket - a rocket having two or...
The stage of a tumor refers to the extent to which lung cancer has spread in the body. Staging involves both evaluation of a tumor's size, as well as the presence or absence of metastases in the lymph nodes or in other organs.Staging is important for determining how a particular tumor should be treated.on-small cell lung cancers (NSCLC) are assigned a stage from I to IV in order of severity. 1  In stage I, the cancer is confined to the lung. 2  In stages II and III, the cancer is confined to the lung and, possibly, the lymph nodes. 3  Stage IV cancer has spread outside of the lung to other parts of the body.