London et al (1964) recorded the case of a 28-yearold woman who had menstrual periods for 5 years and then became amenorrhoeic. He assumed thai the XX cells had to be present for the ovaries tc function regularly as indicated by normal menstruation. If there is a lack of these XX cells primary amenorrhoea will occur and if the XX cells arc 'used up' then the amenorrhoea will be secondary. Summary A case is reported of a 20-year-old woman with a 45,X complement, with dwarfism and numerous other signs of Turner's syndrome, who has been menstruating for the past five years.The question remains whether a single X-chromosome is sufficient for fertility or whether a mosaic pattern has to be suspected in the ovaries of fertile females with Turner's syndrome.

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