Arterial hypertension has n u l t i p l e aetiologies, and i s called "essential" when none of them is discovered. There i s a congenital malformation of the c e l l u l a r architecture of the smooth muscle i n the a r t e r i a l media, that is present i n p a t i d s t h a t develop systemic and/or pulmonary hypertension i n several combinations of severity. Post-mortem findings i n 37 such pa
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