Definition
Anaplastic carcinoma (AC) is a high grade follicular-derived carcinoma with pleomorphic features.
Clinical Features
Incidence
It is a very rare tumor. It constitutes less than 5% of all thyroid malignancies.
Age
It usually affects elderly people, with a mean age in the mid-60s.
Sex
The female-to-male ratio is 2:1 (El Naggar et al. 2017).
Site
It generally presents as a bulk, involving both thyroid lobes and extrathyroid tissue.
Treatment
Most AC are unresectable at diagnosis; however, a surgical approach could be considered in selected patients (El Naggar et al. 2017). Therapy is often multimodal, consisting of surgery, systemic therapy, and/or radiation therapy, because AC often responds poorly to single-modality therapy (Haddad et al. 2018).
Outcome
Despite its rarity, it accounts for more than half of the...
References and Further Reading
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Piana, S. (2020). Anaplastic Carcinoma. In: van Krieken, J. (eds) Encyclopedia of Pathology. Encyclopedia of Pathology. Springer, Cham. https://doi.org/10.1007/978-3-319-28845-1_5259-1
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