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...
Stage 0. Stage 0 cancer is also called carcinoma in situ. It is equivalent to CIN III pre-invasive cancer. In stage 0, the cancer cells are confined to the first layer of cervical tissue (the epithelium) lining the cervix and have not yet spread further in the cervix. In stage IB, the cancer is either visible without a microscope, or it is still microscopic but is more than 5 mm deep or 7 mm wide. 2  Cancer that can be seen without a microscope is divided into Stage 1B1 and Stage 1B2. 3  In stage 1B1, the cancer is smaller than 4 cm.