Which processes results in an increase in size of one or both kidneys?
A common cause of a unilaterally enlarged kidney is compensatory hypertrophy for an absent or poorly functioning contralateral kidney. Hydronephrosis can also result in an enlarged kidney and may affect one or both kidneys. Patients with polycystic renal disease may also have kidneys that appear enlarged, often with multiple cold defects seen due to cysts. Renal vein thrombosis can also result in ipsilateral enlargement of a kidney related to the engorgement of blood.