Calcification of the adrenal glands is an occasional incidental finding on abdominal X-rays. Causes include previous TB and adrenal haemorrhage.
If an adrenal gland is fully calcified and the renal outline is well-defined, as on the right in this image, then it is easy to say the calcification is adrenal.
If, however, an adrenal gland is not fully calcified and the kidney is not well-defined, as on the left in this image, then it can be difficult to determine whether the calcification is adrenal or renal.