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[MRI changes in spontaneous intracranial hypotension]
S Honma1, T Fukazawa, K Hamada
1Hokuyukai Neurology Hospital.
Rinsho Shinkeigaku = Clinical Neurology
|July 1, 1996
Summary
Spontaneous intracranial hypotension (SIH) can cause headaches and MRI abnormalities like pachymeningeal enhancement. These changes may resolve spontaneously, highlighting the importance of considering SIH in diagnosing pachymeningitis.
Area of Science:
- Neurology
- Radiology
- Neuroimaging
Background:
- Spontaneous intracranial hypotension (SIH) is a condition characterized by cerebrospinal fluid (CSF) leakage, leading to low CSF pressure.
- Symptoms often include orthostatic headaches, nausea, and vomiting, with potential neurological signs like hyperreflexia.
Observation:
- A 29-year-old woman presented with symptoms suggestive of SIH, including positional headaches and ear pressure.
- Neurological examination revealed hyperreflexia, and lumbar puncture showed low opening pressure with mild CSF abnormalities.
- Brain and cervical MRI demonstrated diffuse pachymeningeal enhancement after gadolinium contrast administration.
Findings:
- The observed MRI findings of diffuse and continuous pachymeningeal enhancement are characteristic of SIH.
- The patient's symptoms and MRI abnormalities showed significant improvement within two months and complete resolution within five months without specific treatment.
- No underlying systemic or neoplastic diseases were identified as the cause.
Implications:
- Pachymeningeal enhancement on MRI in SIH cases should be recognized and differentiated from other causes of hypertrophic pachymeningitis.
- This finding is crucial for accurate diagnosis and management, especially when distinguishing SIH from infectious, neoplastic, or sarcoidosis-related pachymeningitis.