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Table 3 FIGO clinical staging of cervical carcinoma and corresponding MRI findings (Revised 2009)

From: Imaging of endometrial and cervical cancer

FIGO Stage Description MRI findings
I Tumour confined to cervix  
 IA Microscopic invasive tumour No evidence of tumour
 IA1 Stromal invasion ≤3 mm, width ≤7 mm  
 IA2 Stromal invasion >3 mm but ≤5 mm, width ≤7 mm  
 IB Clinically visible invasive tumour or pre-clinical tumours greater than Stage IA Intermediate SI mass against low SI of the background cervical stroma
 IB1 Tumour ≤4 cm  
 IB2 Tumour >4 cm  
II Invasion beyond uterus but not to pelvic side wall or lower third of vagina  
 IIA No parametrial invasion, upper two-thirds of vagina Loss of the normal low SI of the vaginal fornix or wall, usually contiguous with the primary cervical tumour mass
 IIA1 Tumour ≤4 cm  
 IIA2 Tumour >4 cm  
 IIB Parametrial invasion Breach of the low SI ring of the cervical stroma
III Tumour extends to pelvic sidewall and/or involves the lowest third of vagina  
 IIIA Tumour extends to lower third of vagina, not to pelvic sidewall Loss of the normal low SI of the vaginal wall in the lower third of vagina
 IIIB Extension to pelvic sidewall and/or hydronephrosis or non-functioning kidney Presence of tumour within 3 mm of internal obturator, levator ani and pyriformis muscles or the iliac vessels. Additional signs are increased SI and/or retraction of pelvic muscles, presence of hydronephrosis due to ureteral obstruction at the level of the primary tumour
IV Tumour extends outside true pelvis or invades bladder or rectal mucosa  
 IVA Invasion of bladder or rectal mucosa Tumour nodules protruding into the bladder/rectal lumen.
 IVB Distant metastasis Tumour involving organs outside the true pelvis, includes the para-aortic and inguinal nodes
  1. SI signal intensity