Summary: This case report describes a patient with a spontaneousjejunal fistula. This is a rare type of nephro-intestinal fistula with only two previously recorded similar cases.Our patient presented with such a fistula diagnosed by antegrade pyelography, associated with a staghorn calculus and proven at surgery. The value of antegrade pyelography is discussed along with the treatment options and the outcome to be expected in such patients.