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CAT scan of patient with HAPE. (a) Note the convex pulmonary arch due to pulmonary hypertension in the acute phase. The heart apex is likewise elevated due to dilatation of the right ventricle. (b) In the recovery stage of HAPE (two days later during treatment) a decrease of the pulmonary arch can be observed at closely similar CAT scan coronal cut level (the size of the heart, due to systole or diastole, may have variations).
