Oligoastrocytoma
A type of malignant brain tumor that belongs to the category of “mixed” gliomas. Gliomas are brain tumors that begin in glial, or supportive, cells in the brain or spinal cord. Malignant gliomas are the most common primary tumors of the central nervous system (the brain and spinal cord). Mixed gliomas are gliomas that contain more than one type of cell. An oligoastrocytoma is a mixed glioma composed of cells that resemble two different kinds of brain cells known as astrocytes and oligodendrocytes.
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- Oligodactyly
Having fewer than the normal number of fingers or toes. Oligodactyly is the opposite of polydactyly.
- Oligodendrocyte
A type of cell in the central nervous system. The oligodendrocytes surround and insulate the long fibers (axons) through which the nerves send electrical messages.
- Oligodendroglioma
A rare, slow-growing brain tumor that begins in cells called oligodendrocytes, which provide support and nourishment for cells that transmit nerve impulses. Also known as oligodendroglial tumor.
- Oligomenorrhea
Less menstrual blood flow than usual.
- Oligonucleotide
A short DNA molecule that is composed of relatively few nucleotide bases.