This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
Carcinoma endometrium involving uterine cavity more than 10 cms long with early myometrial involvement is 
Select and explain. 
A. Stage Ia, B. Stage Ib, C. Stage IIa, D. Stage IIb
B: Stage Ib
Answer: B: Stage Ib 
Explanation: Ans- The International Federation of Gynecology and Obstetrics(FIGO) staging system for carcinoma of corpus uteri is as follows:Stage IA-Tumor limited to endometrium <8 cm)Stage IB-Invasion to less than one half the myometrium (>8 cm)Stage IC-Invasion to more than one half the myometriumStage IIA-Endocervical glandular involvement onlyStage lIB-Cervical stromal invasionStage IlIA-Tumor invades serosa and/or adnexa and/or positive peritoneal cytologyStage IIIB-Vaginal metastasisStage IUC-Metastases to pelvic and/or para-aortic lymph nodesStage IVA-Tumor invasion of bladder and/or bowel mucosaStage IVB-Distant metastases including intra-abdominal and/or inguinal lymph nodesCases of carcinoma of the corpus should be classified (or graded) according to the degree of histologic differentiation. The histopathology and degree of differentiation is as follows:i. Class G1-Non squamous or non morular solid growth pattern of 5% or lessii. Class G2-Non squamous or non morular solid growth pattern of 6-50%iii. Class G3-Non squamous or non morular solid growth pattern of more than 50%Please note the new staging and use this for answering mcqsCARCINOMA OF THE ENDOMETRIUMIA Tumor confined to the uterus, no or < 1/2 myometrial invasionIB Tumor confined to the uterus, > 1/2 myometrial invasionII Cervical stromal invasion, but not beyond uterusIIIA Tumor invades serosa or adnexaIIIB Vaginal and/or parametrial involvementIIIC1 Pelvic node involvementIIIC2 Para-aortic involvementIVA Tumor invasion bladder and/or bowel mucosaIVB Distant metastases including abdominal metastases and/or inguinal lymph nodes