What is the primary indication for using Tc succimer (DMSA)?

• A. Cardiac stress testing
• B. Renal function assessment
• C. Liver imaging
• D. Thyroid scans

Answer: (B)

Tc succimer (DMSA) is primarily indicated for renal function assessment. This radiopharmaceutical is specifically used in scintigraphy to evaluate kidney function and morphology. During the imaging procedure, DMSA is preferentially taken up by the renal cortex, allowing for the visualization of renal anatomy and assessment of conditions such as renal scarring, congenital anomalies, and the overall function of each kidney.

In contrast, the other options do not accurately reflect the main application of DMSA. Cardiac stress testing typically involves different radiopharmaceuticals that target myocardial perfusion. Liver imaging requires agents that are specifically designed to assess hepatic function and anatomy, which would differ from a renal-specific agent like DMSA. Thyroid scans utilize radiopharmaceuticals that are absorbed by thyroid tissue and would not include Tc succimer. This distinction underscores the tailored use of Tc succimer specifically for renal imaging.