The authors report a case of 25-year-old @entity1 with a rare acute presentation of @entity722 ( @entity722 ) as an @entity43 . Right salpingoo-ooferectomy was performed. The pathological diagnosis was @entity722 One month after the surgery there was a three-cm @entity42 in the contralateral ovary and the @entity5 size increased to six cm in diameter in the following month. Serum inhibin-B levels progressively increased. Cystectomy was performed to contralateral ovary as frozen-section examination indicated @entity5 . Final histopathological examination revealed @entity5 . Regarding her request, the @entity1 was reoperated again and unilateral oophorectomy and hysterectomy were performed. Clinicians must be aware of the possibility of an underlying @entity5 associated with adnexal torsion even in young @entity1 . Frozen section will be helpful in order to avoid incomplete surgeries. Cyst rapidly growing in the ovary in young @entity1 should raise the suspicion of a de novo @entity5 .

@entity722 presenting with @entity43 and de novo XXXX in the contralateral ovary.

@entity1 :: ('9606', 'Species') :: ['women', 'patients', 'patient'] @entity43 :: ('MESH:D010051', 'Disease') :: ['ovarian torsion'] @entity722 :: ('MESH:D006106', 'Disease') :: ['GCT', 'granulosa cell tumor'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'mucinous tumor', 'borderline mucinous tumor', 'malignancy'] @entity42 :: ('MESH:D010048', 'Disease') :: ['ovarian cyst']
@entity43 :: (MESH:D010051,Disease) :: ['borderline mucinous ovarian tumor']
