SUMMARYThis case report demonstrates the use of ECG gated first pass and equilibrium gated radionuclide cineangiography in the non‐invasive diagnosis of a left atrial myxoma. It also shows that the ECG gated first pass method in the left posterior oblique projection may be more sensitive than previously described radionuclide techniques in the diagnosis of this condition because it enables visualisation of tumour motion in profile during the entire cardiac cycle and is unimpeded by tracer activity from other cardiac structure