The Simple Nephrectomy Is Not Always Simple: Predictors of Surgical Difficulties

Inflammation is one of the major risk factors for SN complications because the dense and fibrotic tissue leads to significant challenges to dissection.

We aimed to evaluate the predictive factors preoperatively, especially inflammation markers and radiologic findings, which can pose challenges to surgery in simple nephrectomy.

We retrospectively evaluated the data of 156 patients who underwent simple open nephrectomy. There were 87 patients in group 1 (peroperative nonadherent perinephric fat) and 69 patients in group 2 (peroperative adherent perinephric fat). The preoperative computed tomography findings (renal volume, perinephric stranding, posterior perinephric fat thickness, lateral perinephric fat thickness, Hounsfield unit [HU] of perinephric fat, HU of subcutaneous fat, HU of renal parenchyma, HU of renal pelvis), side of the kidney affected, prior surgery at the same kidney, complication rates, and operative time were analyzed. Preoperative inflammation markers, neutrophil-lymphocyte ratio, systemic immune-inflammation index, monocyte-HDL ratio, and platelet-lymphocyte ratio levels were recorded.

Preoperative NLR and SII were statistically higher, and HDL was statistically lower in group 2; there was no difference in PLR and monocyte-HDL ratio between the 2 groups. According to the preoperative imaging, the perinephric stranding, HU of perinephric fat, and HU of renal parenchyma were higher in group 2, 54 (78.3), -36.93 (-91.46, -21.69), and 38.60 (32.11, 41.94), respectively. DM, history of nonsterile urine culture, HU of perinephric fat >61.78, and SII >689.36 were the factors that could be identified as independent significant predictors of presence of adherent perinephric fat.

The radiological findings and inflammation markers can be used as the predictive factor for peroperative adherent perinephric tissue and surgical difficulties.