Doctor told me that symptoms of pleural effusion won't go away in x ray even after treatment is it possible?

X-Ray does not show: symptoms, only density/ability to absorb X-Rays so they do not reach the film. Standard X-Ray images are just shadows, "shadograms" if you will, using higher frequency (above visible light) electromagnetic radiation. The shadows, on X-Rays, of pleural effusions/lung densities, etc. often linger much longer than the effusion itself due to proteins which take longer for body to remove than water.

Yes: The xray signs of a pleural effusion may persist long after the symptoms are gone.

Maybe: Not sure exactly what the question is, but X-ray changes typically lag behind clinical lung disease. In other words, you can get better, but the X-ray may still look abnormal for a while. Hope this helps!

It depends: So pleural effusion is seen on a chest x. ray, and after treatment (ie drainage), there should be a difference, however, if a cxr is taken day/ month later the effusion may have recurred. I do not have enough room to go into any further details however if a pleural effusion is seen on a chest x ray and it is large enough that it can be tapped, then it should be tapped for diagnosis & treatment