We present a case of primary hydatid disease of the sacrum. The diagno
sis was made on MR imaging obtained to evaluate the spine for recurren
t disc disease. The patient had previously undergone laminectomy elsew
here for L4-5 radiculopathy. Ultrasound-guided aspiration and visualis
ation of scolices confirmed the diagnosis. No other site of involvemen
t was found.