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Table 2 FIGO staging of endometrial carcinoma and corresponding MR findings (revised 2009)

From: Imaging of endometrial and cervical cancer

FIGO Stage Description MRI findings
Stage Ia Tumour confined to the corpus uteri  
 IA Tumour extending to <50% of myometrial depth Signal intensity of tumour extends into <50% of myometrium. Partial or full thickness disruption of the junctional zone
 IB Tumour extending to >50% of myometrial depth Signal intensity of tumour extends into >50% of myometrium. Full thickness disruption of the junctional zone
Stage IIa Tumour invades cervical stroma, but does not extend beyond the Uterus Internal os and endo-cervical canal are widened. Disruption of low signal stroma
Stage IIIa Local and/or regional spread of the tumour  
 IIIA Tumour invades the serosa of the corpus uteri and/or adenexae Disruption of continuity of outer myometrium. Irregular uterine configuration
 IIIB Vaginal and/or parametrial involvement Segmental loss of hypointense vaginal wall
 IIIC Metastases to pelvic and/or para-aortic lymph nodes Regional or para-aortic nodes >1 cm in short axis diameter
 IIIC1 Positive pelvic nodes  
 IIIC2 Positive para-aortic lymph nodes ± positive pelvic lymph nodes  
Stage IVa Tumour invades bladder and/or bowel mucosa, and/or distant metastases  
 IVA Tumour invasion of bladder and/or bowel mucosa Tumour nodules protruding in the bladder/rectal lumen
 IVB Distant metastases, including intra-abdominal metastases and/or inguinal lymph nodes Tumour in distant sites or organs
  1. aPositive cytology obtained at peritoneal washings should be recorded but does not alter any stage