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An update on papillary microcarcinoma
Simon Grodski1, Leigh Delbridge
1Monash University Endocrine Surgery Unit, The Alfred Hospital, Melbourne, Australia.
Purpose Of Review:
There is a worldwide increasing incidence of thyroid cancer, mostly due to the increased diagnosis of papillary microcarcinoma (PMC). This review examines its clinical significance and optimal treatment.
Recent Findings:
It is unclear whether or not the increase in PMC is real, or is simply due to the increased detection and diagnosis. The increase has been attributed to the widespread availability of thyroid ultrasound, with increasing numbers of clinically insignificant thyroid nodules subject to fine needle aspiration biopsy and surgical excision. An additional explanation is simply an increase in the number of routine histologic sections taken from the thyroidectomy specimens over the years. There have been two recent large clinical series with long-term follow-up highlighting the excellent prognosis of PMC. Novel research into immunohistochemical markers and advanced imaging with fluorodeoxyglucose positron emission tomography aims to identify the markers of more aggressive PMC. Management of PMC remains controversial, from observation alone to total thyroidectomy/radioiodine ablation.
Summary:
PMC has been increasing rapidly over recent decades due to increased cervical ultrasound and increased detection in pathological specimens. There is no compelling evidence base for the management of PMC, with retrospective series highlighting the excellent prognosis.
Insights
The incidence of papillary microcarcinoma (PMC) is rising globally, largely due to improved detection methods like ultrasound. Current evidence suggests PMC has an excellent prognosis, yet its optimal management remains debated.
Area of Science:
- Endocrinology
- Oncology
- Pathology
Background:
- Thyroid cancer incidence is increasing worldwide, with papillary microcarcinoma (PMC) driving this trend.
- The rise in PMC diagnosis is linked to enhanced detection via thyroid ultrasound and increased histological examination of thyroid specimens.
Purpose of the Study:
- To review the clinical significance of papillary microcarcinoma (PMC).
- To examine the optimal treatment strategies for PMC.
Main Methods:
- Literature review of clinical significance and treatment of PMC.
- Analysis of recent clinical series with long-term follow-up data.
- Exploration of novel research in immunohistochemical markers and advanced imaging (e.g., FDG-PET).
Main Results:
- The increase in PMC diagnosis may be attributed to increased detection rather than a true rise in incidence.
- Long-term follow-up studies indicate an excellent prognosis for PMC.
- Research is ongoing to identify markers for more aggressive PMC subtypes.
Conclusions:
- Papillary microcarcinoma (PMC) incidence has increased due to improved diagnostic techniques.
- There is a lack of robust evidence for PMC management, though retrospective data show favorable outcomes.
- Optimal management strategies for PMC, ranging from observation to aggressive treatment, are still under debate.
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