Treatment & Surgery: What to Expect

When a biopsy result comes back as “indeterminate”—such as Bethesda III or Bethesda IV—the primary goal of treatment is to determine the best next step for your specific situation ^[1]. Because tests like ultrasound and biopsy cannot see through the nodule’s capsule, surgery is often recommended to prove whether a nodule is a benign follicular thyroid adenoma (FTA) rather than cancer ^[2].

The Gold Standard: Diagnostic Lobectomy

The standard surgical approach for a suspected follicular adenoma is a lobectomy (also called a hemithyroidectomy) ^[3]. In this procedure, the surgeon removes only the half of the thyroid gland containing the nodule.

A lobectomy is considered “diagnostic” because its main purpose is to provide the pathologist with the entire nodule to examine ^[1]. If the final pathology report confirms the nodule is an FTA, the surgery is complete, and no further treatment is usually needed ^[4].

Why Not Remove the Whole Thyroid?

You may wonder why surgeons don’t simply remove the entire gland (total thyroidectomy) to be “safe.” For most patients with a suspected FTA, removing the whole gland is avoided for several important reasons:

• Preserving Hormone Function: Many patients who keep half their thyroid can still produce enough hormone to avoid taking daily medication, though roughly 30% will eventually need levothyroxine ^[5][6].
• Lower Risk to Vocal Cords: The recurrent laryngeal nerve, which controls your voice, runs behind the thyroid. Removing only half the gland avoids the possibility of bilateral nerve injury ^[7].
• Protecting Calcium Levels: Your parathyroid glands (four tiny glands that regulate calcium) are located on the back of the thyroid. Total thyroidectomy substantially increases the risk of damaging these glands, which can lead to lifelong low calcium levels (hypoparathyroidism) ^[3][7].

Total thyroidectomy is a shared decision. Total removal might be considered if there are highly suspicious nodules on both sides, significant compressive symptoms, or strong patient preference, but even some confirmed low-risk cancers are appropriately treated with lobectomy ^[1][8].

Understanding the Risks

Every surgery has risks, but a lobectomy is generally a very safe procedure with a short recovery time.

1. Hypothyroidism: While the goal is to preserve thyroid function, your remaining lobe might not be able to keep up with your body’s demands. Approximately 20% to 40% of lobectomy patients eventually need levothyroxine (thyroid hormone replacement) ^[6][9].
2. Voice Changes: Temporary hoarseness is common due to irritation from the breathing tube or the surgery itself. Permanent voice changes from unilateral nerve damage occur in about 1% to 2% of cases ^[7]. Surgeons often use intraoperative nerve monitoring as an adjunct tool to help protect the nerve ^[10].
3. Low Calcium: This is rare in a lobectomy because the parathyroid glands on the untouched side usually continue to function normally ^[3].
4. Completion Surgery: If the final pathology report unexpectedly finds a higher-risk cancer, you may discuss a second surgery to remove the remaining half of the thyroid. This is not expected for a confirmed benign FTA, but it is a possibility when going into diagnostic surgery for an indeterminate nodule ^[11].

The Option of Active Surveillance

Before surgery, in some carefully selected cases, you and your doctor may choose active surveillance (monitoring) instead of an immediate operation. This might be considered if:

• The nodule has low-risk ultrasound findings ^[12].
• Molecular testing (like Afirma or ThyroSeq) has come back with a reassuring, “benign” result, lowering the estimated risk ^[13][14].
• You have significant surgical risks or a strong preference to avoid surgery ^[15].

Surveillance involves regular ultrasounds to ensure the nodule is not growing or changing ^[15]. If significant growth is detected, it triggers a reassessment and potentially a recommendation for surgery.

Preparing for Your Consultation

When meeting with a surgeon, it is important to ask about their experience. Research shows that surgeons who perform a high volume of thyroid surgeries (some definitions use 25 to 50 or more annually) generally have lower complication rates and shorter hospital stays ^[16][17]. Do not hesitate to ask your surgeon for their specific complication rates and whether they use tools like nerve monitoring to help protect your voice during the procedure.