Morphological pattern of non-diabetic nephropathy in type 2 diabetes mellitus patients

Abstract. The aim of this study was to evaluate the contribution of kidney biopsy performed with an appropriate indication to diagnosis and treatment in diabetic patients with nephropathy. Methods: In this retrospective study 32 type 2 diabetes patients who underwent kidney biopsy in a single center between 2012-2019 were included. Kidney biopsy indications were determined as patients with diabetes without diabetic retinopathy and with proteinuria above 1 g/day. Results: Diabetic (DN) and non-diabetic (NDN) nephropathies were diagnosed with renal biopsy. In 14 (43.7%) of 32 patients, NDN was reported in histopathological evaluation. Membranous nephropathy was detected in 4 of these patients, focal segmental glomerulosclerosis (FSGS) in the other 4 patients, light chain disease in 2 patients, IgA nephropathy in 2 of the patients, minimal change nephropathy in another patient, and finally AA amyloid in one patient. NDRD seen superimposed on DN (DN + interstitial nephritis and DN + FSGS) was observed in 2 patients. DN was detected in 16 (50%) of 32 type 2 diabetic patients. Conclusion: Kidney biopsy in patients with type 2 diabetes is an important tool for diagnosing NDN, choosing the right treatment tactics and determining kidney prognosis.