Kidney absent | Solitary kidney | Solitary kidney secondary | Single functional kidney | Solitary Kidney | Solitary Functioning Kidney | Unilateral Renal Agenesis | Renal Agenesis, Unilateral | Single Kidney | Kidney, Single | Kidneys, Single | Single Kidneys | Single Functioning Kidney | Functioning Kidney, Single | Functioning Kidneys, Single | Kidney, Single Functioning | Kidneys, Single Functioning | Single Functioning Kidneys | Unilateral Renal Hypoplasia | Renal Hypoplasia, Unilateral |