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Radiation-induced cranial nerve palsy.

P S Berger, J P Bataini

    Cancer
    |July 1, 1977
    PubMed
    Summary

    Cranial nerve palsies, particularly the twelfth nerve, are a common complication after head and neck radiotherapy. Latency periods for these radiation-induced nerve injuries correlate with radiation dose.

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    Area of Science:

    • Neurology
    • Oncology
    • Radiotherapy

    Background:

    • Head and neck tumors often require radical radiotherapy.
    • Radiotherapy can lead to various complications, including cranial nerve palsies.

    Purpose of the Study:

    • To analyze the incidence and characteristics of cranial nerve palsies following radiotherapy for head and neck tumors.
    • To investigate the relationship between radiation dose and the latency period of these palsies.

    Main Methods:

    • Retrospective analysis of 25 patients with 35 cranial nerve palsies post-radiotherapy.
    • Correlation analysis between radiation dose (NSD) and the time to onset of nerve palsy.

    Main Results:

    • The twelfth cranial nerve was most frequently affected (19 cases), followed by the tenth (9 cases) and eleventh (5 cases).
    • Palsies occurred between 12 and 145 months post-diagnosis.
    • A statistically significant correlation (r=-0.58) was found between radiation dose and latency period.

    Conclusions:

    • Cranial nerve palsies are a significant long-term complication of head and neck radiotherapy.
    • Latency period can help differentiate radiation-induced palsies from tumor recurrence, but clinical observation is crucial for confirmation.

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