A rare complication after ureterorenoscopy lithotripsy: Subcapsular renal hematoma.

Objective: To evaluate the prevalence, risk factors, clinical manifestations, and outcomes of subcapsular renal hematoma (SRH) following ureterolithotripsy.

Patients and methods: Between January 2014 and December 2023, patients who underwent ureterorenoscopy lithotripsy (URL) at our hospital were retrospectively reviewed. Clinical data including basic information, calculi-related indicators, and perioperative period data were collected. A Student's t-test was used for continuous data, while a Chi-square test or Fisher's exact test was utilized for categorical data.

Results: A total of 2098 patients treated with URL for ureteric stones were included in this study. The incidence of SRH after URL was 0.52% (11 cases). All SRH cases were confirmed by non-contrast computed tomography, with an average patient age of 55.54 years (range 34-84). The mean stone size in patients with SRH was 10.54 cm (range 0.8-1.5). Patients with SRH had a higher proportion of severe hydronephrosis caused by ureteral stones (54.55% vs 26.07%, p = 0.032) and narrow ureters (45.45% vs 8.04%, p < 0.001) compared to those without SRH. Patients with SRH experienced a longer length of stay, with a significant difference between the two groups (11.64 ± 5.05 vs 3.87 ± 8.12, p < 0.001). Nine patients were managed conservatively without further intervention, while embolization was required in one patient and percutaneous drainage was performed in another. All SRH cases resolved completely during a 4-month follow-up.

Conclusions: The incidence of SRH following URL is low, with severe hydronephrosis and narrow ureters identified as risk factors. Most SRH cases can be successfully managed conservatively, although patients with SRH may experience a significant prolongation of their length of stay.