Tetracycline instillation for recurrent cystic thyroid nodules.

Area of Science:

• Endocrinology
• Surgical Oncology
• Interventional Radiology

Background:

• Recurrent thyroid nodules, both pure cystic and mixed cystic-solid, pose a clinical challenge.
• Repeated needle aspirations are often insufficient for managing fluid reaccumulation in these nodules.

Purpose of the Study:

• To evaluate the efficacy and safety of direct intra-lesional tetracycline instillation for recurrent thyroid nodules.
• To assess the resolution rates of pure cystic and mixed cystic-solid thyroid nodules after tetracycline treatment.

Main Methods:

• Ten patients with recurrent thyroid nodules (5 pure cystic, 5 mixed cystic-solid) were enrolled.
• Tetracycline was injected directly into the cystic lesions after failed needle aspirations.
• Patient outcomes and fluid reaccumulation were monitored over a mean follow-up of 15 months.

Main Results:

• Complete resolution was observed in all pure cystic thyroid nodules.
• Significant size reduction and prevention of fluid reaccumulation occurred in four of five mixed cystic-solid nodules.
• The procedure was well-tolerated by all patients.

Conclusions:

• Intra-lesional tetracycline instillation is a simple, safe, and effective treatment for recurrent pure cystic thyroid nodules.
• Tetracycline injection demonstrates efficacy in managing recurrent mixed cystic-solid thyroid nodules, reducing size and preventing fluid reaccumulation.
• This minimally invasive approach offers a promising therapeutic option for challenging recurrent thyroid lesions.