_______________ of Fluid is required to produce costophrenic angle bluting** on erect chest X-ray, in cases of pleural effusion:: (A) 100ml, (B) 300ml, (C) 500ml, (D) 750ml
Answer is B. 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.