Gall Bladder Activity On Technetium99m-Ethylenedicysteine Renogram Masquerading As Ectopic Kidney

Tc-99m-EC (Technetium-99m-ethylenedicysteine) is a renal tubular imaging agent introduced as an alternative to Tc-99m-MAG3 (Technetium-99m-mercaptoacetyltriglycine) (1). This radiopharmaceutical can be easily labeled at room temperature and has high radiochemical purity and long stability for at least 8 h. Within 1 h 70% of Tc-99m-EC is excreted in the urine (2). Tc-99m-EC provides the same Scintigraphic information as Tc-99m-MAG3. The Hepato biliary excretion of Tc-99m-EC is very low and usually does not affect image interpretation on routine imaging, the possibility of visualization of the gall bladder should be kept in mind while reporting the Tc-99m-EC renogram (1). We present a case of Tc-99m-EC renogram, a suspected case of hypoplastic/ectopic right kidney, to look for ectopic kidney. In this case, there was unexpected visualization of gallbladder in delayed images. We herewith present this case, so that physician should be careful while reporting Tc-99m-EC renogram, as there may be chances for gall bladder to be masquerading as Ectopic kidney.