The Thyroid Nodule You Never Knew You Had
“They found a thyroid nodule on my MRI!” My longtime patient, Julie, called me in a panic.
Those six simple words stopped her in her tracks. She had undergone an MRI after weeks of shoulder pain, and suddenly she was worried about her thyroid—something she hadn't been thinking about at all.
Julie’s experience is becoming increasingly common. With today's advanced imaging, thyroid nodules are frequently discovered incidentally on imaging studies performed for completely unrelated reasons. A finding you never knew existed can suddenly become a source of considerable worry. These are known as incidental thyroid nodules, and discovering one can understandably raise a lot of questions: Why is it there? Does it need to be treated? Could it be cancer? What happens next?
The good news is that thyroid nodules are extremely common, and the vast majority are benign. While a small percentage are associated with thyroid cancer, most thyroid nodules do not pose a serious health threat. The challenge is determining which nodules need further evaluation and which can simply be watched. That is where a thoughtful, individualized evaluation can make a real difference.
A thyroid nodule is a growth or area of tissue within the thyroid gland that is either solid, fluid-filled, or some combination. Most cause no symptoms at all, but some patients may notice a lump or experience a sensation of pressure in the neck or throat, difficulty swallowing, or a change in voice. Importantly, these symptoms do not necessarily mean a nodule is cancerous as even benign thyroid conditions can cause similar symptoms. When I evaluate a thyroid nodule, I don't look at one characteristic in isolation; I consider the patient's history, physical examination, the nodule's size and appearance, and the ultrasound findings as a whole. Size alone doesn't tell the entire story. A smaller nodule with certain suspicious ultrasound characteristics may warrant more attention than a larger nodule with a reassuring appearance. My goal is to determine what, if anything, needs to be done—and just as importantly, to avoid unnecessary testing or procedures when they aren't warranted.
So what happens after a nodule is found? After Julie called me, we met to review her MRI findings and discuss what they meant. Following a careful neck examination, I performed a dedicated thyroid ultrasound in the office. Ultrasound is an essential tool for evaluating thyroid nodules because it allows us to look closely at the thyroid and assess specific features of a nodule, including its composition, margins, shape, and other characteristics. These findings help us estimate whether a nodule appears reassuring or suspicious and determine the appropriate next step. Sometimes, the ultrasound is reassuring enough that no immediate intervention is needed. In those cases, observation may be all that is necessary. Other nodules may benefit from periodic ultrasound monitoring to make sure they remain stable. Occasionally, when a nodule has certain suspicious characteristics and meets established size and risk criteria, I recommend a fine-needle aspiration (FNA) biopsy.
After reviewing Julie's ultrasound, I recommended an FNA based on the nodule's margins. Understandably, Julie was nervous. I explained exactly what I was looking for and walked her through the procedure. During the brief, in-office ultrasound-guided procedure, I obtained cells from the thyroid nodule for pathological evaluation. She tolerated the biopsy well despite her nerves. A few days later, her cytology report came back benign— just the news we were hoping for. We reviewed the results together, discussed what they meant, and made a plan to repeat her thyroid ultrasound in six months to make sure the nodule remained stable. What initially felt frightening to Julie had become something much more manageable: an unexpected finding, a careful evaluation, a reassuring answer, and a plan.
The Bottom Line on Thyroid Nodules
Most thyroid nodules are benign, and even when thyroid cancer is diagnosed, many thyroid cancers are highly treatable. So if you are unexpectedly told that you have a thyroid nodule, try not to panic. A thyroid nodule is a finding—not a diagnosis. What matters is understanding what you have and knowing what needs to be done about it. A careful evaluation and, when appropriate, a biopsy can help separate the nodules that need attention from those that simply need to be watched. When my patient comes to me worried about a thyroid nodule, my goal is not only to determine whether the nodule is concerning but to help my patient understand the finding, answer the questions that naturally come with it, and create a thoughtful plan together. For Julie, an unexpected finding on an MRI ultimately led to a reassuring answer and a proper plan for follow-up.
If you have an imaging study that unexpectedly identifies a thyroid nodule, speak with an endocrinologist about what the finding means for you so that we can identify the nodules that need attention—and give you peace of mind about the ones that don't.
