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Complications associated with therapeutic neck radiation
1Massachusetts General Hospital, Department of Oral and Maxillofacial Surgery, Harvard School of Dental Medicine, Boston 02114, USA.
Summary
Neck radiation for oral cancer causes long-term side effects, including limited neck movement, hypothyroidism, and xerostomia. While skin changes were mild, thyroid function and carotid arteries were significantly affected by radiation dose.
Area of Science:
- Oncology
- Radiation Oncology
- Morbidity Studies
Background:
- Neck radiation is a common treatment for oral cavity squamous cell carcinoma.
- Understanding long-term treatment-related morbidity is crucial for patient management.
Purpose of the Study:
- To identify and quantify the long-term morbidity associated with neck radiation therapy for oral cavity squamous cell carcinoma.
- To assess the impact of radiation on skin, thyroid function, neck mobility, carotid arteries, salivary glands, and glottic structures.
Main Methods:
- Retrospective study of 35 patients treated between 1985 and 1992.
- Standardized treatment protocols were followed.
- Randomized recall for examination to assess long-term effects.
Main Results:
- 57% experienced grade 1 skin changes; no severe changes or secondary cancers observed.
- 14.3% developed hypothyroidism, significantly associated with radiation dose.
- Significant limitation in all ranges of neck motion was observed.
- 14.3% had carotid bruits, linked to higher doses in N+ cases.
- Xerostomia (dry mouth) affected 68% of patients.
- 11.4% had persistent glottic erythema.
Conclusions:
- Neck radiation leads to persistent complications including limited neck movement, diminished thyroid function, and accelerated carotid artery narrowing.
- Skin and salivary gland changes are also common sequelae.
- Radiation dose is a significant factor in the development of hypothyroidism and carotid artery disease.