Opportunistic condition
A condition that occurs especially or exclusively in persons with a weak immune system due, for example, to AIDS, cancer or immunosuppressive drugs, such as corticosteroids or chemotherapy. An opportunistic condition may be an infection, such as toxoplasmosis or cytomegalovirus (CMV), or a tumor, such as Kaposi’s sarcoma in AIDS. See also opportunistic infection, opportunistic microorganism.
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- Opportunistic infection
An infection that occurs because of a weakened immune system. Opportunistic infections are a particular danger for people with AIDS. The HIV virus itself does not cause death, but the opportunistic infections that occur because of its effect on the immune system can. See also opportunistic condition, opportunistic microorganism.
- Opportunistic microorganism
Opportunistic condition, Opportunistic infection.
- Optic cup
The white, cup-like area in the center of the optic disc. The optic disk is the circular area at the back of the inside of the eye where the optic nerve connects to the retina.
- Optic glioma
A rare, most commonly benign tumor on the optic nerve or the optic chiasm (the crossing of the two optic nerves). Optic gliomas cause pressure and destruction of normal optic nerve tissue. They are most common in children and teens. Optic gliomas are strongly associated with neurofibromatosis (NF1).
- Optic disc
The circular area in the back of the inside of the eye where the optic nerve connects to the retina. Also called the optic nerve head.