Cerebellar ataxia- MedGen UID:
- 849
- •Concept ID:
- C0007758
- •
- Disease or Syndrome
Cerebellar ataxia refers to ataxia due to dysfunction of the cerebellum. This causes a variety of elementary neurological deficits including asynergy (lack of coordination between muscles, limbs and joints), dysmetria (lack of ability to judge distances that can lead to under- oder overshoot in grasping movements), and dysdiadochokinesia (inability to perform rapid movements requiring antagonizing muscle groups to be switched on and off repeatedly).
Postural tremor- MedGen UID:
- 66696
- •Concept ID:
- C0234378
- •
- Sign or Symptom
A type of tremors that is triggered by holding a limb in a fixed position.
Slurred speech- MedGen UID:
- 65885
- •Concept ID:
- C0234518
- •
- Finding
Abnormal coordination of muscles involved in speech.
Congenital cerebellar hypoplasia- MedGen UID:
- 120578
- •Concept ID:
- C0266470
- •
- Congenital Abnormality
Hypoplasia of the cerebellum that is associated with inherited metabolic disorders and neurodegenerative disorders. Signs and symptoms include mental and developmental delays, walking and balance difficulties, floppy muscle tone, and seizures.
Intellectual disability- MedGen UID:
- 334384
- •Concept ID:
- C1843367
- •
- Finding
Motor delay- MedGen UID:
- 381392
- •Concept ID:
- C1854301
- •
- Finding
A type of Developmental delay characterized by a delay in acquiring motor skills.
Congenital aniridia- MedGen UID:
- 1941
- •Concept ID:
- C0003076
- •
- Congenital Abnormality
Aniridia is an eye disorder characterized by a complete or partial absence of the colored part of the eye (the iris). These iris abnormalities may cause the pupils to be abnormal or misshapen. Aniridia can cause reduction in the sharpness of vision (visual acuity) and increased sensitivity to light (photophobia).People with aniridia can also have other eye problems. Increased pressure in the eye (glaucoma) typically appears in late childhood or early adolescence. Clouding of the lens of the eye (cataracts), occur in 50 percent to 85 percent of people with aniridia. In about 10 percent of affected people, the structures that carry information from the eyes to the brain (optic nerves) are underdeveloped. Individuals with aniridia may also have involuntary eye movements (nystagmus) or underdevelopment of the region at the back of the eye responsible for sharp central vision (foveal hypoplasia). Many of these eye problems contribute to progressive vision loss in affected individuals. The severity of symptoms is typically the same in both eyes.Rarely, people with aniridia have behavioral problems, developmental delay, and problems detecting odors.
Nystagmus- MedGen UID:
- 45166
- •Concept ID:
- C0028738
- •
- Disease or Syndrome
Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)
Visual impairment- MedGen UID:
- 22663
- •Concept ID:
- C0042798
- •
- Finding
Reduced ability to perceive visual stimuli.
Hypoplasia of the iris- MedGen UID:
- 91029
- •Concept ID:
- C0344539
- •
- Congenital Abnormality
Congenital underdevelopment of the iris.
- Abnormality of the eye
- Abnormality of the nervous system