Fine-Needle Aspiration Biopsy of the Thyroid (cont.)
Ruchi Mathur, MD, FRCP(C)
Ruchi Mathur, MD, FRCP(C) is an Attending Physician with the Division of Endocrinology, Diabetes and Metabolism and Associate Director of Clinical Research, Recruitment and Phenotyping with the Center for Androgen Related Disorders, Department of Obstetrics and Gynecology at Cedars-Sinai Medical Center.
William C. Shiel Jr., MD, FACP, FACR
Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.
In this Article
- Fine needle aspiration biopsy facts
- What are thyroid nodules?
- What is the initial assessment of a thyroid nodule?
- Fine needle aspiration biopsy (FNAB) of the thyroid gland; why is it done?
- Should fine needle aspiration biopsy be done on all thyroid nodules?
- How is fine needle aspiration biopsy performed?
- What are the complications of fine needle aspiration biopsy of the thyroid?
- What happens to the thyroid tissue obtained at the fine needle aspiration biopsy?
What is the initial assessment of a thyroid nodule?
All patients with a thyroid nodule should undergo a complete medical history and physical examination. Specific questions regarding the onset of the nodule, related pain or discomfort, symptoms of thyroid disease, and family history are addressed. In addition, the doctor will take into account the patient's age and sex when evaluating the possibility of malignancy. Patients with a history of head and neck radiation (which was commonly used in the 1950's as an acne treatment) are at a higher risk. Cancerous nodules are also more frequent in men as compared to women. The doctor will also look for general symptoms of thyroid disease in addition to other illnesses. The size and characteristics of the nodule are assessed. Is it soft or firm? Does it move with swallowing, or is it fixed? Is there more than one nodule? Are there other nodes involved? Does it hurt when the nodule is touched? The answers to these questions will help the doctor evaluate what further investigations, if any, are necessary.
The following is a list of factors that increase the suspicion of malignancy:
- Age: Patients less than 30 years of age and greater than 60 years of age have a higher risk of cancer in a thyroid nodule as do children;
- Associated symptoms such as difficulty swallowing or hoarseness;
- History of head and neck irradiation;
- A hard, fixed nodule on examination;
- Surrounding enlarged lymph nodes; and
- Previous history of thyroid cancer in the family.
Nodules are less concerning to a physician if it is one of many present in the gland, and also if the nodule is hyperfunctioning (or "hot") using nuclear thyroid imaging.
After the initial evaluation, the doctor may choose to order thyroid blood tests or imaging scans to determine the functional activity of a thyroid nodule and it's anatomy. The cornerstone in the assessment of a solitary thyroid nodule is a procedure known as fine needle aspiration biopsy ("FNAB") of the thyroid gland.
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