_______________ of Fluid is required to produce costophrenic angle bluting** on erect chest X-ray, in cases of pleural effusion:
At least 100ml of fluid is required to detect by USG.
A minimum of 300ml is required to produce bluttening of costophrenic angle on erect chest X-ray.
About 500ml of effusion is required for detection on clinical examination.
100ml
300ml
500ml
750ml