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Figure 2 (A) Short-axis projection of a myocardial single photon emission computed tomography (SPECT) with ^99mTc-sestamibi, where right ventricular (RV) wall hypertrophy and cavity dilation that increases after stress are evident. The left ventricle (LV) is shown without perfusion defects. (B) Myocardial SPECT with ^99mTc sestamibi processed to mask the LV enhances RV visualization where there are no evident perfusion defects. (C) Short-axis projection of a myocardial SPECT with ^99mTc sestamibi corresponding to D. (D) Myocardial SPECT with ^99mTc sestamibi processed to enhance RV visualization, where perfusion defects are evident in the basal third of the inferior and lateral walls of the RV in the stress images only (arrows). There is marked dilation and hypertrophy of the RV walls.