There are also autosomal recessive disorders that resemble sporadic cases of HD. Main examples are chorea acanthocytosis, pantothenate kinase-associated neurodegeneration and X-linked McLeod syndrome.
Some persons develop huntington’s disease as adults, but without chorea. They may appear rigid and move very little, or not at all, a condition called akinesia.
Some individuals develop symptoms of HD when they are very young–before age 20. The terms “early-onset” or “juvenile” HD are often used to describe HD that appears in a young person. A common sign of HD in a younger individual is a rapid decline in school performance. Symptoms can also include subtle changes in handwriting and slight problems with movement, such as slowness, rigidity, tremor, and rapid muscular twitching, called myoclonus.

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