Hi,Welcome to Health care magic forum.
You had a kidney transplantation
13 years back, and had beta cell lymphoma
, and had several chemo rounds. The time lapse, and chemo load both may contribute for the kidney changes. To know the reason may not be possible by any doctor.
The thing in front of you is to find the condition of the kidney, and what is the treatment for it and to know the prognosis.
From our side it is possible to know the facts in depth by our ask a specialist , there you can have approach to a nephrologist
, and clear your doubts by direct approach.
Wishing for a quick and complete recovery. Thank you.