Hello Mr Yadav, Heterogeneous = consisting of dissimilar areas or parts, not homogeneous X-ray opacity = areas which does not allow passage of x-rays Usually x-ray shows areas of white and dark regions. Bones appear mostly as white areas. Heart in the center of the x-ray is also white. Air in the lung is seen as dark regions. Over the heart area, the white appearance is featureless – homogeneous, of uniform nature. In some diseases of the lungs, x-ray may show areas which are mixture of white and dark patches. Such areas are called heterogeneous or non-homogeneous areas or opacities. Such heterogeneous areas may be seen in bronchopneumonia, tuberculosis or bronchiectasis, in addition to other diseases. I am sure your doctor would have prescribed medicines and hope you are on your way to recovery.