Normal Images Incomplete Tracer Mixing
This is a 5 year old girl, with history of urinary tract infections. Underwent direct cystography with 99mTc-DTPA. Note bladder filling and emptying was complete. Small residual volume at the end. No activity was detected in excretory system. However, you may notice a double gray contrast, darker at the bottom. This is explained by not emptying fully the bladder before initiating the filling and administering the tracer (Personal Remark). The second bladder filling was positive, after noting this pitfall and correcting it.
References:
Orellana P et al. Reflujo Vesicoureteral, p: 419-424 in: Medicina Nuclear Aplicaciones Clínicas. Eds: I. Carrio - P. González. Editorial Masson, Barcelona España, 2003.