<prompt> Cryptomenorrhoea is most commonly seen with:Imperforate hymenAsherman syndromePCODVaginal agenesis  <response>: Ans: a Imperforate hymen Ref: Shaw, 13th ed,p.280In women with cryptomenorrhoea presenting as primary amenorrhoea the commonest cause is a intact hymen.Imperforate hymenClinical features1deg amenorrhoeaUrinary retentionPeriodic lower abdominal painSign: Visualization of tense bluish bulging membrane on separation of labia.Newborn - Mucocolpos with in one week of birthDiagnosis: USG pelvisTreatment of imperforate hymen: Cruciate incision on hymenCommonest site at which hymen ruptures during intercourse - postero lateral area 