Causes of<unk>  have appeared to change over time. Initially, the phenomena were most often caused by traumatic injuries, such as contact sports or motor vehicle collisions. More recently, the majority of cases are postprocedural or secondary to mass lesions. Several factors have been implicated as contributory to this change, namely: the more liberal use of high-quality imaging and the increased utilization of invasive procedures. Documented iatrogenic causes include: intra-abdominal surgery, lithotripsy, renal biopsy, and percutaneous endopyelotomy. The biggest shift in cause comes from kidney allograft biopsy, which now accounts for the majority of<unk>  cases.
Page kidney
Multicystic dysplastic kidney
Horseshoe kidney
Medullary sponge kidney
Crossed renal ectopia
Ectopic kidney
Glomerulocystic kidney disease
Medullary cystic kidney disease