Nonseminoma
A type of testicular cancer that arises in specialized sex cells called germ cells that give rise to sperm. Nonseminomas include embryonal carcinoma, teratoma, choriocarcinoma, and yolk sac tumor.
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- Nonsense mutation
A mutation (a change) in a base in the DNA that prematurely stops the translation (reading) of messenger RNA (mRNA) resulting in a polypeptide chain that ends prematurely and a protein product that is truncated (abbreviated) and incomplete and usually nonfunctional. The nonsense mutation converts a codon (a triplet of bases) that encodes an amino […]
- Nonstructural scoliosis
A structurally normal spine that appears to have a lateral curve (scoliosis). Nonstructural scoliosis involves a temporary change of spinal curvature. This is caused by an underlying condition such as a difference in leg length, muscle spasms, or inflammatory conditions, (e.g. appendicitis), which may produce muscle spasm. Correcting the underlying problem treats this type of […]
- Nonsyndromic
Not part of a syndrome. Hearing loss, for instance, can be syndromic or nonsyndromic.
- Nonsyndromic deafness
Hearing loss which is not part of a syndrome. Deafness with no related signs and symptoms affecting other parts of the body.
- Noonan syndrome (NS)
A multifaceted genetic disorder characterized by a series of birth defects (congenital malformations) including dysmorphic (malformed) facial features, short stature after birth (postnatal growth retardation), webbing of the neck (pterygium colli), caved-in chestbone (pectus excavatum), cardiovascular problems (pulmonic stenosis and hypertrophic cardiomyopathy), bleeding tendency and, in boys, testes that do not descend normally into the […]