Third-trimester rudimentary horn pregnancy. A case report.
BACKGROUND
Müllerian ducts fuse in the midline to form the uterus at about 10 weeks' gestation. Rudimentary horn pregnancies are unusual occurrences.


METHODS
A 34-year-old woman presented at 24 weeks' gestation for prenatal care. Rudimentary horn pregnancy was diagnosed. Shortly afterwards the patient developed an acute abdomen, followed by emergency delivery. Though the risks of complications were high, none occurred.


CONCLUSIONS
The incidence of rudimentary horn pregnancy is 1/100,000-150,000. Surgery is the treatment of choice. The prognosis is poor.
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Department of Gynecology and Obstetrics, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-1228, USA.
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D000328:Adult; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D011247:Pregnancy; D011256:Pregnancy Outcome; D011263:Pregnancy Trimester, Third; D011271:Pregnancy, Ectopic / Q000175:diagnosis* / Q000473:pathology; D014599:Uterus / Q000002:abnormalities*