pigmented casts most commonly found are of erythrocytic origin
other causes of pigmentation of casts include
administration of chromogenic drugs
in cases of jaundice - the more severe the icterus is at the time the casts are formed, the darker their colour
whether due to jaundice or to chromogenic drugs, the yellow colour of the casts is generally accompanied by a similar colour in the free nucleated cells and in some of the debris
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