- Design
- Retrospective single-centre cohort
- Population
- 769 tonsillectomy specimens (307 paediatric, 462 adult)
- Primary outcome
- Occult (unexpected) malignancy
- Effect
- Paediatric 0% (0-1.19%); adult unexpected 1 of 443 (0.23%)
This retrospective cohort reviewed all 769 tonsillectomy specimens (307 paediatric, 462 adult) at a large US safety-net hospital and head and neck cancer referral centre from 2022 to 2025.
No paediatric specimen contained malignancy (0%; 95% CI 0-1.19%). There were 20 adult malignancies, and 19 were expected or suspected before surgery. The one unexpected cancer, a mantle cell lymphoma, was 0.23% of the 443 adult tonsils removed without preoperative concern.
Routine histology of every tonsil costs time and money. Safety-net populations have higher cancer risk, so this was a stringent test of whether clinical assessment is enough, and it largely was.
The numbers are small and single-centre, so the confidence intervals leave room for a rare cancer to be missed.
- Examine tonsils carefully preoperatively for asymmetry, ulceration, induration or neck nodes.
- Send specimens for histology where there is any clinical suspicion or risk factor.
- Consider a risk-stratified pathology policy for routine paediatric tonsillectomy.
- Document the preoperative examination that supports not sending a specimen.
Why it matters
It supports focusing histology on clinically suspicious tonsils instead of routinely examining every specimen.
Don't overread it
With 769 specimens at one hospital, the study cannot exclude a rare occult malignancy rate of up to about 1%.
The statistics, in plain English
Finding zero cases does not mean the true rate is zero; the upper confidence limit of 1.19% in children is the highest rate still consistent with the data.
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