the spot on x-ray over hip may be a sign of stone or a stenosis or ureter
or a stricture or a block by hard mass or even a mistake.
the enlargement of kidney
may be due to hydronephrosis
anddue to retension of urine.
pain which is seen in abdomen and lower back have some connection with kidney also
any way consult the doctor discuss with him about your complains with the x-ray and get the good treatment from him