Multifocal fibrosing thyroiditis

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Multifocal fibrosing thyroiditis, abbreviated MFT, is a benign pathology of the thyroid that can mimic papillary thyroid carcinoma.

It is also known as multifocal sclerosing thyroiditis.[1]

General

  • Uncommon - though may be under-recognized.
  • Female predominant in largest series (93% of cases versus 7% of cases).[1]

Microscopic

Features:[1]

  • Fibrotic foci - two foci required - key feature.
    • May be: (1) sharply demarcated from the surround parenchyma (stellate or triangular) or (2) band-like.

Note:

DDx:[1]

See also

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 Fellegara, G.; Rosai, J. (Mar 2015). "Multifocal fibrosing thyroiditis: report of 55 cases of a poorly recognized entity.". Am J Surg Pathol 39 (3): 416-24. doi:10.1097/PAS.0000000000000337. PMID 25353282.