Splenic pregnancy--case report.

Primary splenic pregnancy is the rarest form of extrauterine pregnancy. Only six cases have previously been documented, none of which occurred in North America. A case of this rare entity is presented in which a pregnancy was found to arise from the spleen, requiring splenectomy. In addition to the classic signs of a fulminant ruptured ectopic pregnancy, a history of upper abdominal pain was the only distinguishing feature.