Tc-99m tetrofosmin reverse perfusion pattern with ST segment depression after dipyridamole infusion in a patient with unstable angina and no evident coronary artery stenoses.

Reverse redistribution is a well-known pattern found when performing thallium myocardial scintigraphy, and it has been implicated as an indicator of myocardial ischemia. Much more rarely, when using technetium compounds, which do not redistribute, a similar pattern is noted after the second injection of the radiotracer. This pattern has been termed "reverse perfusion pattern," and its full implications are not yet clear and are still being investigated.