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Renal Scans in Pregnant Transplant Patients

Department of Radiology, Division of Nuclear Medicine, Department of Obstetrics and Gynecology, Division of Maternal - Fetal Medicine, and Department of Surgery, Division of Renal Transplantation, Georgetown University Hospital, Washington, DC

Correspondence: For reprints contact: Harvey A. Ziessman, MD, Div. of Nuclear Medicine, Georgetown University Hospital, 3800 Reservoir Road, NW, Washington, DC 20007

ABSTRACT

This study demonstrates the normal technetium-99m diethylenetriaminepentaacetic acid ([^99mTc]DTPA) renal scan in pregnant patients with transplanted kidneys. Five pregnant renal transplant patients had seven[^99mTc]DTPA renal studies to assess allograft perfusion and function. All scans showed the uteroplacental complex. The bladder was always compressed and distorted. The transplanted kidney was frequently rotated to a more vertical position. In all patients allograft flow and function were maintained. There was calyceal retention on all studies and ureteral retention activity in three of five patients. Using the MIRD formalism, the total radiation absorbed dose to the fetus was calculated to be 271 mrad. This radiation exposure is well within NRCP limits for the fetus of radiation workers and an acceptable low risk in the management of these high risk obstetric patients.