Summary. Seventy‐five women admitted for sterilization were laparoscoped during menstruation. Retrograde spillage of menstrual blood was observed in 76%. The occurrence of dysmenorrhoea was not associated with spillage of menstrual blood, observed endometriosis or tubal pathology. Mild or stage I endometriosis was detected in 43% of all the women but in only 54% of those who had retrograde spill. Retrograde spill was seen in 97% of those with endometriosis. A significant association (P<0.00l) was found between endometriosis and tubal damage not due to endometriosis. The implication of these findings are discussed.
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