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Hypoglossal nerve palsy: a segmental approach
1Department of Radiology, Medical College of Virginia, Richmond 23298.
Summary
Hypoglossal nerve (cranial nerve XII) palsy is rare but has distinct symptoms like tongue atrophy. Radiologists can pinpoint causes by understanding the nerve
Area of Science:
- Neurology
- Radiology
- Head and Neck Anatomy
Background:
- Hypoglossal nerve (cranial nerve XII) palsy is an uncommon condition.
- Unilateral tongue muscle atrophy is a key clinical manifestation of hypoglossal nerve damage.
Purpose of the Study:
- To outline an efficient imaging strategy for evaluating hypoglossal nerve palsy.
- To correlate specific nerve segments with potential causative disorders.
Main Methods:
- Detailed review of hypoglossal nerve anatomy, divided into five segments: medullary, cisternal, skull base, nasopharyngeal/oropharyngeal carotid space, and sublingual.
- Correlation of potential pathologies with each anatomical segment.
Main Results:
- Localizing lesions to a specific nerve segment aids in narrowing the differential diagnosis.
- Different disorders commonly affect distinct segments of the hypoglossal nerve.
Conclusions:
- Understanding the segmented anatomy of the hypoglossal nerve is crucial for accurate diagnosis of palsy.
- Computed tomography and magnetic resonance imaging are valuable tools for assessing hypoglossal nerve dysfunction, with modality choice dependent on patient factors.
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