vascular hyalinosis
A syndrome characterized by progressive hyalinosis involving capillaries and often arterioles and small veins of the digestive tract, kidneys, and idiopathic cerebral calcifications. It has been described in three sisters born to non-consanguineous parents. All three patients also had poikilodermia and graying hair, as well as severe diarrhea, rectal bleeding, malabsorption and subarachnoid hemorrhage.