Dystocia caused by a parovarian cyst is of rare occurrence. A review of the literature since 1873 shows only sixty-two1 reports of parovarian cysts complicating all stages of pregnancy and in only seven cases did the cyst produce dystocia. This paper includes a summary of all the cases complicating pregnancy that have been reported since 1873. No such analysis has been made previously. The study was prompted by a recent case in which a parovarian cyst produced a pelvic block and required aspiration of the cyst to permit delivery of the fetus.
Ovarian cysts and solid tumors, such as myomas, may also cause pelvic block and dystocia. The solid tumors can usually be differentiated from cysts, but the differential diagnosis of ovarian from parovarian cysts is often impossible during pregnancy and labor. Vozza2 in a review from his own clinic of 108 cases of cysts complicating pregnancy found
DOWNING W, O'TOOLE L. PAROVARIAN CYSTS COMPLICATING PREGNANCYREPORT OF CASE CAUSING DYSTOCIA: REVIEW OF LITERATURE. JAMA. 1939;112(18):1798-1803. doi:10.1001/jama.1939.02800180022008