A 21 year old woman (G2 P0101)
of 24 weeks gestation presented with syphilis of unknown duration.
Sonography revealed fetal hydrops and placental thickening. Weekly intramuscular injections of 2.4
million U Bicillin for 3 weeks was initiated as recommended by the Centers for Disease Control.
Repeat sonogram 1 week after starting treatment revealed increased ascites and a new pericardial
effusion. Due to the worsening fetal condition, therapy was altered and the patient was admitted for
IV penicillin. She received a continuous infusion of 18 million U penicillin G daily for 10 days. Serial
sonograms showed improvement offetal ascites and pericardial effusion with 10 days of IV therapy,
and complete resolution of hydrops was noted within 3 weeks. The fetus was born at term with no
stigmata of congenital syphilis on newborn exam, and laboratory tests suggested adequate treatment
in utero.