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Functional and structural neuroimaging in trigeminal autonomic cephalalgias
1Headache Group, Institute of Neurology, Queen Square, London WC1N 3BG, UK. m.matharu@ion.ucl.ac.uk
Current Pain and Headache Reports
|May 14, 2008
Summary
Trigeminal autonomic cephalalgias (TACs) are linked to central nervous system mechanisms. Neuroimaging reveals hypothalamic involvement in TACs, suggesting these headaches originate centrally, not peripherally.
Area of Science:
- Neurology
- Neuroscience
- Headache Medicine
Background:
- Trigeminal autonomic cephalalgias (TACs) are primary headache disorders with unilateral pain and autonomic symptoms.
- Historically, TACs were attributed to peripheral factors like vascular changes or neurogenic inflammation.
Purpose of the Study:
- To investigate the central nervous system's role in the pathophysiology of TACs.
- To re-evaluate the underlying mechanisms of TACs using modern neuroimaging.
Main Methods:
- Functional neuroimaging studies were employed to observe brain activity during TAC episodes.
- Voxel-based morphometry and magnetic resonance spectroscopy were used to assess brain structure and biochemistry.
Main Results:
- Functional imaging consistently showed hypothalamic activation across all TACs.
- Neuroimaging identified structural and biochemical changes in the hypothalamus of cluster headache patients.
Conclusions:
- The hypothalamus is critically involved in the pathophysiology of TACs.
- Evidence supports a central mechanism for TACs, challenging previous peripheral theories.
