A U5 thyroid nodule has yielded Thy1 cytology twice despite ultrasound-guided fine-needle aspiration. There is no evidence of anaplastic disease or distant metastasis. What is the best next management principle?
Repeated Thy1 sampling does not neutralise highly suspicious imaging. NICE supports core biopsy or repeat sampling with on-site adequacy and allows diagnostic hemithyroidectomy when samples remain non-diagnostic; the MDT should choose the safest route to diagnosis.
A. Discharge because no malignant cells were seen: Thy1 means inadequate, not benign, and the U5 appearance remains concerning.
B. Repeat identical unguided FNAC indefinitely: Repeating a failed method without improving adequacy prolongs uncertainty.
C. Give radioiodine empirically: Radioiodine is not a diagnostic treatment for an unclassified nodule.
D. Begin lifelong TSH suppression without diagnosis: Suppression neither establishes histology nor appropriately treats an undiagnosed U5 lesion.
E. Obtain definitive tissue through core biopsy or diagnostic surgery after MDT review: Repeated Thy1 sampling does not neutralise highly suspicious imaging. NICE supports core biopsy or repeat sampling with on-site adequacy and allows diagnostic hemithyroidectomy when samples remain non-diagnostic; the MDT should choose the safest route to diagnosis.
If the second sample were adequate and Thy2 with reassuring repeat imaging, surveillance or discharge could be considered according to the complete risk assessment.
Independent Clinora educational preparation material; not official JCIE content, an accredited programme, clinical advice, or a substitute for local policy and specialist judgement.
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