Approximately 90% of thyroid cancers present with a thyroid lump.
Though thyroid lumps most commonly represent benign growths in the form of cysts or toxic nodules in a small proportion of cases it is the presenting symptom of thyroid cancer.
This note focuses on the evaluation of unexplained thyroid lumps.
Patients presenting with unexplained thyroid lumps should receive urgent referral to a thyroid surgeon or endocrinologist.
Patients with signs of tracheal compression such as stridor should be admitted to hospital for urgent review.
Thyroid lumps associated with abnormal thyroid function tests are unlikely to be malignant and can be referred on a routine basis to an endocrinologist. Despite this most will refer on an urgent basis and awaiting TFTs should not delay referral. Similarly, those with acute pain in a thyroid lump can be referred on a routine basis as this typically represents bleeding into a benign cyst.
Thyroid lumps should be investigated with clinical examination, ultrasound scan +/- fine needle aspiration cytology (FNAC).
All patients should have a full clinical review including a medical history (carefully evaluating family history and any exposure to carcinogens). This is followed by a clinical examination looking for signs of thyroid hormone imbalance and lymphadenopathy as well as evaluating the nodule itself.
Ultrasound is the imaging modality of choice for thyroid lumps. A score U 1-5 is given based on the radiographical appearance of the nodule.
In addition, any lymphadenopathy, retrosternal extension or tracheal compression should be commented upon.
FNAC should be carried out on all U 3 – 5 lesions. Patients with U 1 and U 2 lesions do not need FNAC unless considered high risk for malignancy.
FNAC allows for cytological assessment of a thyroid nodule. Reports may classify results as:
The results of the investigation of a thyroid lump are not always conclusive.
As a rule, if there is discordance between the clinical, radiographical or cytological results the case should be discussed at a specialist MDT.
Those with benign ultrasound appearances and Thy 2 cytology do not typically need follow up USS or FNAC unless the patient is considered high risk for malignancy.
Those with indeterminate or suspicious USS and Thy 1 cytology should undergo repeat USS and FNAC and MDT discussion.
Those with indeterminate or suspicious USS and Thy 2 cytology should undergo repeat USS and FNAC and MDT discussion.
Should be discussed at MDT. Normally further USS and FNAC is ordered. Further results should again be discussed at MDT.
Should be discussed at MDT. Typically, a diagnostic hemithyroidectomy is indicated to formally establish the diagnosis.
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