We describe a case of pulmonary emboli due to mercury in a female drug
addict who was HIV positive and had voluntarily injected herself with
mercury. The diagnosis was guided by the history and by the character
istics of the chest radiograph and was confirmed by blood and urine le
vels of mercury and the radiograph taken of the site of the intravenou
s injection. Three years after the injection the patient did not revea
l any signs suggesting disturbance due to the chronic pulmonary exposu
re to mercury, but there was a reduced carbon monoxide transfer whose
interpretation was difficult due to the past respiratory history and t
o the drug addiction.