Extrinsic causes of vesical filling defects on scintigraphy

Three children are reported with vesical filling defects on scintigraphy secondary to extrinsic causes. In two chronically constipated individuals undergoing bone scintigraphy, the extrinsic pressure on the bladder by rectosigmoid feces resulted in simulation of intrinsic space-occupying lesions. Focal attenuation of bladder activity on nuclear cystography by the metal distal hook of a Harrington rod also produced the pseudo-appearance of a vesical filling defect in a third patient.