Chronic Traumatic Encephalopathy

Neurological Disorder MONDO:0043512 Pathograph 4 Show in embeddings browser Tauopathy Neurodegenerative Disease

Chronic traumatic encephalopathy (CTE) is a progressive neurodegenerative tauopathy caused by exposure to repetitive head impacts — concussive and subconcussive — most strongly associated with contact sports (American football, boxing, soccer, ice hockey) and military blast exposure. Originally described as dementia pugilistica in boxers, CTE is now recognized across many causes of repeated head trauma. Its pathognomonic lesion is perivascular accumulation of hyperphosphorylated tau at the depths of cortical sulci, with supportive TDP-43 proteinopathy in limbic regions. Clinically it produces cognitive impairment, behavioral and mood disturbances, parkinsonism, and, in a subset, motor neuron disease — linking CTE to the elevated ALS risk observed in professional contact-sport athletes. CTE can presently be diagnosed definitively only at autopsy.

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4
Pathophys.
4
Phenotypes
4
Pathograph
⚙

Pathophysiology

4
Repetitive Head Trauma
The initiating exposure is repeated concussive and subconcussive head impacts sustained over years, as in contact sports, military blast injury, and other causes of recurrent head trauma. This mechanical exposure triggers the downstream neurodegenerative tauopathy after a long latency.
Downstream
Perivascular Hyperphosphorylated Tau Pathology Repetitive head impacts trigger accumulation of hyperphosphorylated tau at the depths of cortical sulci around small vessels.
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"Chronic traumatic encephalopathy (CTE) is a form of neurodegeneration believed to result from repeated head injuries."
Establishes repetitive head injury as the causal exposure initiating the CTE neurodegenerative cascade.
Perivascular Hyperphosphorylated Tau Pathology
The pathognomonic lesion of CTE is the accumulation of abnormal hyperphosphorylated tau (p-tau) in neurons and astroglia clustered around small blood vessels at the depths of cortical sulci in an irregular pattern. This perivascular, sulcal-depth distribution distinguishes CTE from other tauopathies such as Alzheimer disease and progressive supranuclear palsy.
neuron CL:0000540 astrocyte CL:0000127
inclusion body assembly GO:0070841 ↑ INCREASED
Downstream
TDP-43 Proteinopathy Tau pathology in CTE is accompanied by supportive TDP-43 neuronal cytoplasmic inclusions in limbic regions.
Show evidence (2 references)
PMID:26667418 SUPPORT Human Clinical
"Chronic traumatic encephalopathy (CTE) is a neurodegeneration characterized by the abnormal accumulation of hyperphosphorylated tau protein within the brain."
The NINDS/NIBIB consensus defines CTE as a tau neurodegeneration, the basis of this central-effector node.
PMID:26667418 SUPPORT Human Clinical
"the panel defined the pathognomonic lesion of CTE as an accumulation of abnormal hyperphosphorylated tau (p-tau) in neurons and astroglia distributed around small blood vessels at the depths of cortical sulci"
Defines the perivascular, sulcal-depth p-tau lesion in neurons and astroglia that is pathognomonic for CTE.
TDP-43 Proteinopathy
Beyond the dominant tauopathy, CTE shows supportive TDP-43 proteinopathy: TDP-43-immunoreactive neuronal cytoplasmic inclusions in the hippocampus, anteromedial temporal cortex, and amygdala. This places CTE within the family of TDP-43 proteinopathies and is mechanistically relevant to the motor neuron disease seen in a subset of cases.
neuron CL:0000540
inclusion body assembly GO:0070841 ↑ INCREASED
cytoplasmic TDP-43 inclusion GO:0016234
Downstream
Neurodegeneration with Cognitive, Behavioral, and Motor Decline Combined tau and TDP-43 pathology drives progressive neuronal loss and the clinical syndrome, including motor neuron disease in a subset.
Show evidence (2 references)
PMID:26667418 SUPPORT Human Clinical
"Supportive non-p-tau pathologies include TDP-43 immunoreactive neuronal cytoplasmic inclusions and dot-like structures in the hippocampus, anteromedial temporal cortex and amygdala."
Human consensus neuropathology documents TDP-43 neuronal cytoplasmic inclusions as a supportive feature of CTE, directly supporting conformance to the TDP-43 proteinopathy module.
PMID:21074091 SUPPORT Other
"in some cases, a TDP-43 proteinopathy"
Corroborates that a TDP-43 proteinopathy occurs in a subset of CTE cases.
Neurodegeneration with Cognitive, Behavioral, and Motor Decline
Progressive neurodegeneration produces the CTE clinical syndrome: impaired memory and executive function, behavioral and mood disturbances, parkinsonism, and, in a subset of cases, motor neuron disease. The motor-neuron-disease subset links CTE to the elevated ALS risk reported in professional contact-sport athletes.
neuron CL:0000540
neuron apoptotic process GO:0051402 ↑ INCREASED
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"parkinsonism, and, occasionally, motor neuron disease are seen in affected individuals."
Documents parkinsonism and motor neuron disease among the clinical manifestations of CTE, including the ALS-linked motor-neuron-disease subset.
⬡

Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence and cross-linked metadata.
Pathograph: causal mechanism network for Chronic Traumatic Encephalopathy Interactive directed graph showing how pathophysiology mechanisms, phenotypes, genetic factors and variants, experimental models, environmental triggers, and treatments relate through causal and linked edges.
●

Phenotypes

4
Nervous System 3
Parkinsonism Parkinsonism HP:0001300
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"parkinsonism, and, occasionally, motor neuron disease are seen in affected individuals."
Parkinsonism is a recognized clinical feature of CTE.
Cognitive Impairment Cognitive impairment HP:0100543
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"disordered memory and executive functioning"
Disordered memory and executive functioning are cardinal cognitive features of CTE.
Behavioral and Mood Disturbance Atypical behavior HP:0000708
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"behavioral and personality disturbances (eg, apathy, depression, irritability, impulsiveness, suicidality)"
Behavioral and personality disturbances (apathy, depression, irritability, impulsiveness, suicidality) are defining neuropsychiatric features of CTE.
Other 1
Motor Neuron Disease (ALS) Amyotrophic lateral sclerosis HP:0007354
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"parkinsonism, and, occasionally, motor neuron disease are seen in affected individuals."
A subset of CTE cases develop motor neuron disease (ALS), connecting CTE to the elevated ALS risk seen in contact-sport athletes.
🌍

Environmental Factors

1
Repetitive Head Trauma from Contact Sports and Military Blast
CTE is caused by cumulative exposure to repetitive head impacts. While first described in boxers (dementia pugilistica), it is now recognized after many causes of repeated head trauma, including American football, ice hockey, soccer, professional wrestling, physical abuse, and military blast exposure.
Show evidence (1 reference)
PMID:21074091 SUPPORT Other
"such as those that occur in American football, hockey, soccer, professional wrestling, and physical abuse"
Enumerates the recurrent-head-trauma exposures associated with CTE beyond boxing.
{ }

Source YAML

click to show 
name: Chronic Traumatic Encephalopathy
creation_date: "2026-06-11T00:00:00Z"
category: Neurological Disorder
parents:
- Tauopathy
- Neurodegenerative Disease
disease_term:
  preferred_term: chronic traumatic encephalopathy
  term:
    id: MONDO:0043512
    label: traumatic encephalopathy
description: >-
  Chronic traumatic encephalopathy (CTE) is a progressive neurodegenerative
  tauopathy caused by exposure to repetitive head impacts — concussive and
  subconcussive — most strongly associated with contact sports (American
  football, boxing, soccer, ice hockey) and military blast exposure. Originally
  described as dementia pugilistica in boxers, CTE is now recognized across many
  causes of repeated head trauma. Its pathognomonic lesion is perivascular
  accumulation of hyperphosphorylated tau at the depths of cortical sulci, with
  supportive TDP-43 proteinopathy in limbic regions. Clinically it produces
  cognitive impairment, behavioral and mood disturbances, parkinsonism, and, in a
  subset, motor neuron disease — linking CTE to the elevated ALS risk observed in
  professional contact-sport athletes. CTE can presently be diagnosed
  definitively only at autopsy.
pathophysiology:
- name: Repetitive Head Trauma
  description: >-
    The initiating exposure is repeated concussive and subconcussive head impacts
    sustained over years, as in contact sports, military blast injury, and other
    causes of recurrent head trauma. This mechanical exposure triggers the
    downstream neurodegenerative tauopathy after a long latency.
  role: trigger
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      Chronic traumatic encephalopathy (CTE) is a form of neurodegeneration
      believed to result from repeated head injuries.
    explanation: >-
      Establishes repetitive head injury as the causal exposure initiating the
      CTE neurodegenerative cascade.
  downstream:
  - target: Perivascular Hyperphosphorylated Tau Pathology
    description: >-
      Repetitive head impacts trigger accumulation of hyperphosphorylated tau at
      the depths of cortical sulci around small vessels.
- name: Perivascular Hyperphosphorylated Tau Pathology
  description: >-
    The pathognomonic lesion of CTE is the accumulation of abnormal
    hyperphosphorylated tau (p-tau) in neurons and astroglia clustered around
    small blood vessels at the depths of cortical sulci in an irregular pattern.
    This perivascular, sulcal-depth distribution distinguishes CTE from other
    tauopathies such as Alzheimer disease and progressive supranuclear palsy.
  role: central_effector
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  - preferred_term: astrocyte
    term:
      id: CL:0000127
      label: astrocyte
  biological_processes:
  - preferred_term: inclusion body assembly
    term:
      id: GO:0070841
      label: inclusion body assembly
    modifier: INCREASED
  evidence:
  - reference: PMID:26667418
    reference_title: "The first NINDS/NIBIB consensus meeting to define neuropathological criteria for the diagnosis of chronic traumatic encephalopathy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Chronic traumatic encephalopathy (CTE) is a neurodegeneration characterized
      by the abnormal accumulation of hyperphosphorylated tau protein within the
      brain.
    explanation: >-
      The NINDS/NIBIB consensus defines CTE as a tau neurodegeneration, the basis
      of this central-effector node.
  - reference: PMID:26667418
    reference_title: "The first NINDS/NIBIB consensus meeting to define neuropathological criteria for the diagnosis of chronic traumatic encephalopathy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      the panel defined the pathognomonic lesion of CTE as an accumulation of
      abnormal hyperphosphorylated tau (p-tau) in neurons and astroglia
      distributed around small blood vessels at the depths of cortical sulci
    explanation: >-
      Defines the perivascular, sulcal-depth p-tau lesion in neurons and
      astroglia that is pathognomonic for CTE.
  downstream:
  - target: TDP-43 Proteinopathy
    description: >-
      Tau pathology in CTE is accompanied by supportive TDP-43 neuronal
      cytoplasmic inclusions in limbic regions.
- name: TDP-43 Proteinopathy
  conforms_to: "tdp43_proteinopathy#Cytoplasmic TDP-43 Aggregation"
  description: >-
    Beyond the dominant tauopathy, CTE shows supportive TDP-43 proteinopathy:
    TDP-43-immunoreactive neuronal cytoplasmic inclusions in the hippocampus,
    anteromedial temporal cortex, and amygdala. This places CTE within the family
    of TDP-43 proteinopathies and is mechanistically relevant to the motor neuron
    disease seen in a subset of cases.
  role: amplifier
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  cellular_components:
  - preferred_term: cytoplasmic TDP-43 inclusion
    term:
      id: GO:0016234
      label: inclusion body
  biological_processes:
  - preferred_term: inclusion body assembly
    term:
      id: GO:0070841
      label: inclusion body assembly
    modifier: INCREASED
  evidence:
  - reference: PMID:26667418
    reference_title: "The first NINDS/NIBIB consensus meeting to define neuropathological criteria for the diagnosis of chronic traumatic encephalopathy."
    supports: SUPPORT
    evidence_source: HUMAN_CLINICAL
    snippet: >-
      Supportive non-p-tau pathologies include TDP-43 immunoreactive neuronal
      cytoplasmic inclusions and dot-like structures in the hippocampus,
      anteromedial temporal cortex and amygdala.
    explanation: >-
      Human consensus neuropathology documents TDP-43 neuronal cytoplasmic
      inclusions as a supportive feature of CTE, directly supporting conformance
      to the TDP-43 proteinopathy module.
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      in some cases, a TDP-43 proteinopathy
    explanation: >-
      Corroborates that a TDP-43 proteinopathy occurs in a subset of CTE cases.
  downstream:
  - target: Neurodegeneration with Cognitive, Behavioral, and Motor Decline
    description: >-
      Combined tau and TDP-43 pathology drives progressive neuronal loss and the
      clinical syndrome, including motor neuron disease in a subset.
- name: Neurodegeneration with Cognitive, Behavioral, and Motor Decline
  description: >-
    Progressive neurodegeneration produces the CTE clinical syndrome: impaired
    memory and executive function, behavioral and mood disturbances, parkinsonism,
    and, in a subset of cases, motor neuron disease. The motor-neuron-disease
    subset links CTE to the elevated ALS risk reported in professional
    contact-sport athletes.
  role: effector
  cell_types:
  - preferred_term: neuron
    term:
      id: CL:0000540
      label: neuron
  biological_processes:
  - preferred_term: neuron apoptotic process
    term:
      id: GO:0051402
      label: neuron apoptotic process
    modifier: INCREASED
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      parkinsonism, and, occasionally, motor neuron disease are seen in affected
      individuals.
    explanation: >-
      Documents parkinsonism and motor neuron disease among the clinical
      manifestations of CTE, including the ALS-linked motor-neuron-disease subset.
environmental:
- name: Repetitive Head Trauma from Contact Sports and Military Blast
  notes: >-
    CTE is caused by cumulative exposure to repetitive head impacts. While first
    described in boxers (dementia pugilistica), it is now recognized after many
    causes of repeated head trauma, including American football, ice hockey,
    soccer, professional wrestling, physical abuse, and military blast exposure.
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      such as those that occur in American football, hockey, soccer, professional
      wrestling, and physical abuse
    explanation: >-
      Enumerates the recurrent-head-trauma exposures associated with CTE beyond
      boxing.
phenotypes:
- name: Parkinsonism
  phenotype_term:
    preferred_term: Parkinsonism
    term:
      id: HP:0001300
      label: Parkinsonism
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      parkinsonism, and, occasionally, motor neuron disease are seen in affected
      individuals.
    explanation: >-
      Parkinsonism is a recognized clinical feature of CTE.
- name: Motor Neuron Disease (ALS)
  phenotype_term:
    preferred_term: Amyotrophic lateral sclerosis
    term:
      id: HP:0007354
      label: Amyotrophic lateral sclerosis
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      parkinsonism, and, occasionally, motor neuron disease are seen in affected
      individuals.
    explanation: >-
      A subset of CTE cases develop motor neuron disease (ALS), connecting CTE to
      the elevated ALS risk seen in contact-sport athletes.
- name: Cognitive Impairment
  phenotype_term:
    preferred_term: Cognitive impairment
    term:
      id: HP:0100543
      label: Cognitive impairment
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      disordered memory and executive functioning
    explanation: >-
      Disordered memory and executive functioning are cardinal cognitive
      features of CTE.
- name: Behavioral and Mood Disturbance
  phenotype_term:
    preferred_term: Atypical behavior
    term:
      id: HP:0000708
      label: Atypical behavior
  evidence:
  - reference: PMID:21074091
    reference_title: "Chronic traumatic encephalopathy: a potential late effect of sport-related concussive and subconcussive head trauma."
    supports: SUPPORT
    evidence_source: OTHER
    snippet: >-
      behavioral and personality disturbances (eg, apathy, depression,
      irritability, impulsiveness, suicidality)
    explanation: >-
      Behavioral and personality disturbances (apathy, depression, irritability,
      impulsiveness, suicidality) are defining neuropsychiatric features of CTE.