► Synchronous mucinous metaplasia and neoplasia of the female genital tract (SMMN-FGT) is a rare mucinous lesion. ► This is the first case of SMMN-FGT with DNA sequencing of STK11 and KRAS, but no mutation was identified.
Keywords: KRAS; Mucinous metaplasia; Mucinous tumor; SMMN-FGT; STK11.