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Thyroid biopsy

Author
Douglas S Ross, MD
Section Editor
David S Cooper, MD
Deputy Editor
Jean E Mulder, MD

INTRODUCTION

Thyroid nodules come to clinical attention when noted by the patient, or as an incidental finding during routine physical examination or a radiologic procedure, such as carotid ultrasonography or neck computed tomography (CT). Their clinical importance is primarily related to the need to exclude thyroid cancer, which is present in 4 to 6.5 percent of thyroid nodules. If a serum thyroid-stimulating hormone (TSH) is normal, the next step in the evaluation of a thyroid nodule is a palpation or ultrasound-guided fine-needle aspiration (FNA) biopsy.

This topic will review the techniques, utility, limitations, and complications of percutaneous thyroid biopsies. Ultrasound-guided thyroid biopsy, an atlas of cytopathologic findings, and overview of the diagnosis and treatment of thyroid nodules are discussed separately. (See "Ultrasound-guided thyroid biopsy" and "Atlas of thyroid cytopathology" and "Diagnostic approach to and treatment of thyroid nodules".)

TECHNIQUES

The two most common methods used to obtain tissue from thyroid nodules are fine-needle aspiration (FNA), using a syringe, and fine-needle capillary sampling (FNC), which is done without aspiration. Biopsy can be guided by palpation only or by ultrasound.

Other techniques include large-needle aspiration biopsy and cutting-needle biopsy. The latter has shown to be particularly useful for repetitive non-diagnostic FNAs. (See 'Other techniques' below.)

Fine-needle aspiration biopsy — FNA is a simple and safe office procedure in which tissue samples are obtained for cytologic examination. FNA is performed with or without local lidocaine anesthesia [1], by repetitively moving a 23 to 27-gauge (most commonly 25 or 27-gauge) needle through the nodule. The needle is attached to a 10 mL syringe that may be contained in a holder designed to facilitate the application of constant or intermittent suction. The aspirated material is smeared directly on slides, fixed, and stained, or collected in a liquid preservative from which thin-layer preparations are made. (See 'Procedure' below.)

                  

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Literature review current through: Nov 2016. | This topic last updated: Wed Jan 20 00:00:00 GMT 2016.
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