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1.

Dementia

Dementia is the name for a group of symptoms caused by disorders that affect the brain. It is not a specific disease. People with dementia may not be able to think well enough to do normal activities, such as getting dressed or eating. They may lose their ability to solve problems or control their emotions. Their personalities may change. They may become agitated or see things that are not there. . Memory loss is a common symptom of dementia. However, memory loss by itself does not mean you have dementia. People with dementia have serious problems with two or more brain functions, such as memory and language. Although dementia is common in very elderly people, it is not part of normal aging. Many different diseases can cause dementia, including Alzheimer's disease and stroke. Drugs are available to treat some of these diseases. While these drugs cannot cure dementia or repair brain damage, they may improve symptoms or slow down the disease. NIH: National Institute of Neurological Disorders and Stroke.  [from MedlinePlus]

MedGen UID:
99229
Concept ID:
C0497327
Finding; Mental or Behavioral Dysfunction
2.

Frontotemporal dementia

The clinical manifestations of MAPT-related disorders (MAPT-related tauopathies) are most typically those of frontotemporal dementia (FTDP-17), but also include progressive supranuclear palsy (PSP), corticobasal degeneration (CBD), mild late-onset parkinsonism, and dementia with epilepsy. Clinical presentation of frontotemporal dementia (FTD) is variable: some present with slowly progressive behavioral changes, language disturbances, and/or extrapyramidal signs, whereas others present with rigidity, bradykinesia, supranuclear palsy, and saccadic eye movement disorders. Onset is usually between ages 40 and 60 years, but may be earlier or later. The disease progresses over a few years into profound dementia with mutism. PSP is characterized by progressive vertical gaze palsy in combination with a prominent loss of balance at early stages of the disease. With progression, axial rigidity, dysarthria, and dysphagia become prominent, often in combination with a frontal dysexecutive syndrome. CBD is a progressive neurodegenerative disorder which affects both the frontoparietal cortex and the basal ganglia, resulting in a mild to moderate dementia in combination with asymmetric parkinsonism, ideomotor apraxia, aphasia, and an alien-hand syndrome. [from GeneReviews]

MedGen UID:
83266
Concept ID:
C0338451
Disease or Syndrome
3.

Amyotrophic lateral sclerosis

Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease involving both upper motor neurons (UMN) and lower motor neurons (LMN). UMN signs include hyperreflexia, extensor plantar response, increased muscle tone, and weakness in a topographic representation. LMN signs include weakness, muscle wasting, hyporeflexia, muscle cramps, and fasciculations. Initial presentation varies. Affected individuals typically present with either asymmetric focal weakness of the extremities (stumbling or poor handgrip) or bulbar findings (dysarthria, dysphagia). Other findings may include muscle fasciculations, muscle cramps, and labile affect, but not necessarily mood. Regardless of initial symptoms, atrophy and weakness eventually affect other muscles. The mean age of onset is 56 years in individuals with no known family history and 46 years in individuals with more than one affected family member (familial ALS or FALS). Average disease duration is about three years, but it can vary significantly. Death usually results from compromise of the respiratory muscles. [from GeneReviews]

MedGen UID:
274
Concept ID:
C0002736
Disease or Syndrome
4.

Amyotrophic lateral sclerosis

MedGen UID:
506059
Concept ID:
CN006437
Finding
5.

Frontotemporal dementia

A dementia associated with degeneration of the frontotemporal lobe and clinically associated with personality and behavioral changes such as disinhibition, apathy, and lack of insight. The hallmark feature of frontotemporal dementia is the presentation with focal syndromes such as progressive language dysfunction, or aphasia, or behavioral changes characteristic of frontal lobe disorders. [from HPO]

MedGen UID:
505124
Concept ID:
CN001944
Finding
6.

Parkinson disease, late-onset

Parkinsonism refers to all clinical states characterized by tremor, muscle rigidity, slowed movement (bradykinesia) and often postural instability. Parkinson disease is the primary and most common form of parkinsonism. Psychiatric manifestations, which include depression and visual hallucinations, are common but not uniformly present. Dementia eventually occurs in at least 20% of cases. The most common sporadic form of Parkinson disease manifests around age 60; however, young-onset and even juvenile presentations are seen. [from GeneReviews]

MedGen UID:
463618
Concept ID:
C3160718
Disease or Syndrome
7.

Neurodegeneration

Loss of functional activity and trophic degeneration of nerve axons and their terminal arborizations following the destruction of their cells of origin or interruption of their continuity with these cells. The pathology is characteristic of neurodegenerative diseases. Often the process of nerve degeneration is studied in research on neuroanatomical localization and correlation of the neurophysiology of neural pathways. [from MeSH]

MedGen UID:
17999
Concept ID:
C0027746
Cell or Molecular Dysfunction
8.

Parkinson disease

Parkinsonism refers to all clinical states characterized by tremor, muscle rigidity, slowed movement (bradykinesia) and often postural instability. Parkinson disease is the primary and most common form of parkinsonism. Psychiatric manifestations, which include depression and visual hallucinations, are common but not uniformly present. Dementia eventually occurs in at least 20% of cases. The most common sporadic form of Parkinson disease manifests around age 60; however, young-onset and even juvenile presentations are seen. [from GeneReviews]

MedGen UID:
10590
Concept ID:
C0030567
Disease or Syndrome
9.

Alzheimer disease

Alzheimer disease (AD) is characterized by dementia that typically begins with subtle and poorly recognized failure of memory and slowly becomes more severe and, eventually, incapacitating. Other common findings include confusion, poor judgment, language disturbance, agitation, withdrawal, and hallucinations. Occasionally, seizures, Parkinsonian features, increased muscle tone, myoclonus, incontinence, and mutism occur. Death usually results from general inanition, malnutrition, and pneumonia. The typical clinical duration of the disease is eight to ten years, with a range from one to 25 years. Approximately 25% of all AD is familial (i.e., =2 persons in a family have AD) of which approximately 95% is late onset (age >60-65 years) and 5% is early onset (age <65 years). [from GeneReviews]

MedGen UID:
1853
Concept ID:
C0002395
Disease or Syndrome
10.

Tauopathies

Neurodegenerative disorders involving deposition of abnormal tau protein isoforms (TAU PROTEINS) in neurons and glial cells in the brain. Pathological aggregations of tau proteins are associated with mutation of the tau gene on chromosome 17 in patients with ALZHEIMER DISEASE; DEMENTIA; PARKINSONIAN DISORDERS; progressive supranuclear palsy (SUPRANUCLEAR PALSY, PROGRESSIVE); and corticobasal degeneration. [from MeSH]

MedGen UID:
181880
Concept ID:
C0949664
Disease or Syndrome
11.

Parkinson Disease, Juvenile

MedGen UID:
155699
Concept ID:
C0752105
Disease or Syndrome
12.

Parkinsonism

Characteristic neurologic anomaly resulting form degeneration of dopamine-generating cells in the substantia nigra, a region of the midbrain, characterized clinically by shaking, rigidity, slowness of movement and difficulty with walking and gait. [from HPO]

MedGen UID:
66079
Concept ID:
C0242422
Disease or Syndrome
13.

Metabolic disease

Metabolism is the process your body uses to get or make energy from the food you eat. Food is made up of proteins, carbohydrates, and fats. Chemicals in your digestive system break the food parts down into sugars and acids, your body's fuel. Your body can use this fuel right away, or it can store the energy in your body tissues, such as your liver, muscles, and body fat. A metabolic disorder occurs when abnormal chemical reactions in your body disrupt this process. When this happens, you might have too much of some substances or too little of other ones that you need to stay healthy. . You can develop a metabolic disorder when some organs, such as your liver or pancreas, become diseased or do not function normally. Diabetes is an example. .  [from MedlinePlus]

MedGen UID:
44376
Concept ID:
C0025517
Disease or Syndrome
14.

Unspecified encephalopathy

Encephalopathy is a term that means brain disease, damage, or malfunction. In general, encephalopathy is manifested by an altered mental state. [from HPO]

MedGen UID:
39314
Concept ID:
C0085584
Disease or Syndrome
15.

Motor neuron disease

Diseases characterized by a selective degeneration of the motor neurons of the spinal cord, brainstem, or motor cortex. Clinical subtypes are distinguished by the major site of degeneration. In AMYOTROPHIC LATERAL SCLEROSIS there is involvement of upper, lower, and brainstem motor neurons. In progressive muscular atrophy and related syndromes (see MUSCULAR ATROPHY, SPINAL) the motor neurons in the spinal cord are primarily affected. With progressive bulbar palsy (BULBAR PALSY, PROGRESSIVE), the initial degeneration occurs in the brainstem. In primary lateral sclerosis, the cortical neurons are affected in isolation. (Adams et al., Principles of Neurology, 6th ed, p1089) [from MeSH]

MedGen UID:
38785
Concept ID:
C0085084
Disease or Syndrome
16.

Mental disorder

Mental disorders include a wide range of problems, including. -Anxiety disorders, including panic disorder, obsessive-compulsive disorder, post-traumatic stress disorder, and phobias. -Bipolar disorder. -Depression. -Mood disorders. -Personality disorders. -Psychotic disorders, including schizophrenia. There are many causes of mental disorders. Your genes and family history may play a role. Your life experiences, such as stress or a history of abuse, may also matter. Biological factors can also be part of the cause. A traumatic brain injury can lead to a mental disorder. A mother's exposure to viruses or toxic chemicals while pregnant may play a part. Other factors may increase your risk, such as use of illegal drugs or having a serious medical condition like cancer. Medications and counseling can help many mental disorders. .  [from MedlinePlus]

MedGen UID:
14047
Concept ID:
C0004936
Mental or Behavioral Dysfunction
17.

Abnormality of the basal ganglia

Abnormality of the basal ganglia. [from HPO]

MedGen UID:
14035
Concept ID:
C0004782
Disease or Syndrome
18.

Abnormality of the spinal cord

Your spinal cord is a bundle of nerves that runs down the middle of your back. It carries signals back and forth between your body and your brain. It is protected by your vertebrae, which are the bone disks that make up your spine. If you have an accident that damages the vertebrae or other parts of the spine, this can also injure the spinal cord. Other spinal cord problems include. - Tumors. - Infections such as meningitis and polio. - Inflammatory diseases. - Autoimmune diseases . - Degenerative diseases such as amyotrophic lateral sclerosis and spinal muscular atrophy. Symptoms vary but might include pain, numbness, loss of sensation and muscle weakness. These symptoms can occur around the spinal cord, and also in other areas such as your arms and legs. Treatments often include medicines and surgery. .  [from MedlinePlus]

MedGen UID:
11550
Concept ID:
C0037928
Disease or Syndrome
19.

Neuromuscular Diseases

Neuromuscular disorders affect the nerves that control your voluntary muscles. Voluntary muscles are the ones you can control, like in your arms and legs. Your nerve cells, also called neurons, send the messages that control these muscles. When the neurons become unhealthy or die, communication between your nervous system and muscles breaks down. As a result, your muscles weaken and waste away. The weakness can lead to twitching, cramps, aches and pains, and joint and movement problems. Sometimes it also affects heart function and your ability to breathe. Examples of neuromuscular disorders include. -Amyotrophic lateral sclerosis. -Multiple sclerosis. -Myasthenia gravis. -Spinal muscular atrophy. Many neuromuscular diseases are genetic, which means they run in families or there is a mutation in your genes. Sometimes, an immune system disorder can cause them. Most of them have no cure. The goal of treatment is to improve symptoms, increase mobility and lengthen life.  [from MedlinePlus]

MedGen UID:
10323
Concept ID:
C0027868
Disease or Syndrome
20.

Movement disorders

Imagine if parts of your body moved when you didn't want them to. If you have a movement disorder, you experience these kinds of impaired movement. Dyskinesia is abnormal uncontrolled movement and is a common symptom of many movement disorders. Tremors are a type of dyskinesia. . Nerve diseases cause many movement disorders, such as Parkinson's disease. Other causes include injuries, autoimmune diseases, infections and certain medicines. Many movement disorders are inherited, which means they run in families. Treatment varies by disorder. Medicine can cure some disorders. Others get better when an underlying disease is treated. Often, however, there is no cure. In that case, the goal of treatment is to improve symptoms and relieve pain.  [from MedlinePlus]

MedGen UID:
10113
Concept ID:
C0026650
Disease or Syndrome
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