| HNPP | hereditary neuropathy with liability to pressure palsies |
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| HSAN | hereditary sensory and autonomic neuropathy |
| HSN | hereditary sensory neuropathy; hospital satellite network |
| IDM | idiopathic disease of myocardium; immune defense mechanism; indirect method; infant of diabetic moth... |
| IDP | immunodiffusion procedure; inflammatory demyelinating neuropathy; initial dose period; inosine dipho... |
| lateral root of optic tract | The larger division of the posterior end of the optic tract that terminates in the lateral geniculate body. Synonym: radix lateralis tractus optici. (05 Mar 2000) |
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| Leber's hereditary optic atrophy | Hereditary degeneration of the optic nerve and papillomacular bundle with resulting rapid loss of central vision, progressive for several weeks, then usually stationary with permanent central scotoma; age of onset is variable, most often in the third decade; more males than females are affected and transmission is cytoplasmic and strictly on the female side. Mutation on the mitochondrial chromosome involved, which presumably interacts with an X-linked mutant. This mechanism may explain the bizarre sex ratio, which differs significantly from one country to another. (05 Mar 2000) |
| lenticulo-optic | Relating to the lentiform nucleus and the optic tract; specifically refers to branches of the middle cerebral artery considered to supply these structures. (05 Mar 2000) |