Medullary thyroid cancer staging

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sahar Memar Montazerin, M.D.[2] Ammu Susheela, M.D. [3]

Overview

According to the American Joint Committee on Cancer (AJCC) there are 4 stages of medullary thyroid cancer based on the clinical features and findings on imaging. Each stage is assigned a letter and a number that designate the tumor size, number of involved lymph node regions, and metastasis.

Staging

  • According to the American Joint Committee on Cancer (AJCC) there are 4 stages of medullary thyroid cancer based on the clinical features and findings on imaging.[1]
  • Each stage is assigned a letter and a number that designate the tumor size, number of involved lymph node regions, and metastasis.
Primary tumor
Tumor size Sub-stage Finding Image
T0
  • No evidence of primary tumor
T1
T1 a
T1 b
  • Tumor >1 cm but ≤2 cm in greatest dimension, limited to the thyroid
T2
  • Tumor >2 cm but ≤4 cm in greatest dimension, limited to the thyroid
T3
  • Tumor >4 cm limited to the thyroid, or gross extrathyroidal extension invading only strap muscles
T3 a
T3 b
T4
  • Tumor includes gross extrathyroidal extension beyond the strap muscles
T4 a
T4 b
TX
  • Primary tumor cannot be assessed
Regional lymph node involvement
Node involvement Sub-stage Finding Image
N0
N0 a
N0 b
N1
N1 a
N1 b
NX
Distant metastasis
Presence of metastasis Sub-stage Finding Image
M0
M1 IV


Anatomic Stage/Prognostic Groups
Stage T N M
Medullary thyroid carcinoma
I T1 N0 M0
II T2 N0 M0
T3 N0 M0
III T1 N1a M0
T2 N1a M0
T3 N1a M0
IVA T4a Any N M0
IVB T4b Any N M0
IVC Any T Any N M1

Reference

  1. "Thyroid Cancer Treatment (Adult) (PDQ®)–Health Professional Version - National Cancer Institute".