Ultrasound-guided Laser Thermal Ablation for Treatment of Benign Thyroid Nodules

Objective: To evaluate the efficacy of ultrasound (US)-guided laser thermal ablation (LTA) in reducing the volume of hypofunctioning benign thyroid lesions.

Methods: The criteria for entry into the study were as follows: (1) presence of a hypofunctioning thyroid nodule with a volume exceeding 8 mL, (2) benign cytologic findings, (3) local compression symptoms or patient concern, and (4) refusal of or ineligibility for surgical treatment. Twenty patients (15 women and 5 men; mean age, 63.3 +/- 14.1 years) fulfilling the entry criteria were enrolled in the study. Under US monitoring, a 75-mm, 21-gauge spinal needle was inserted into the thyroid gland, and a flat-tipped 300-microm quartz fiberoptic guide was placed through the needle into the tissues. LTA was performed with use of a 1.064-microm continuous-wave neodymium yttrium-aluminum-garnet laser that had an output power of 3 W for 10 minutes. US scans were used to assess the decrease in nodule volume at 1 month and 6 months after LTA.

Results: After LTA, mean nodule volume decreased from a baseline value of 24.1 +/- 15.0 mL to 13.3 +/- 7.7 mL at 1 month and to 9.6 +/- 6.6 mL at 6 months. Mean nodule volume reduction in comparison with baseline was 43.8 +/- 8.1% at 1 month and 63.8 +/- 8.9% at 6 months. LTA induced burning cervical pain, which rapidly decreased after the laser energy was turned off. Three patients (15%) required treatment with betamethasone for 48 hours. No patient had local bruising, cutaneous burning, or dysphonia.

Conclusion: LTA may be an effective procedure for the treatment of benign cold thyroid nodules that cause pressure symptoms in patients who are not candidates for surgical treatment or who refuse to undergo a surgical procedure.