This population-based study will use provincial health administrative data to examine the risk of hospital admission for hydrocelectomy among males who underwent nephrectomy for kidney cancer, compared with males from the general population with similar baseline health characteristics, who did not undergo nephrectomy. We will use health administrative data from Ontario, Canada, to identify males who underwent nephrectomy for kidney cancer between 1992 and 2024. Four surgical cohorts will be constructed based on procedure type and surgical approach: laparoscopic total nephrectomy, open total nephrectomy, laparoscopic partial nephrectomy, and open partial nephrectomy. A propensity score will be calculated based on sociodemographic characteristics, comorbidities, and health care utilization. For each surgical cohort, patients will be matched to non-nephrectomy male controls (1:4) based on propensity score, age, index date, and modified Charlson Score (excluding cancer). The primary analysis will compare patients undergoing laparoscopic total nephrectomy and laparoscopic partial nephrectomy with matched non-nephrectomy controls from the general population. The primary outcome is hospital admission for hydrocelectomy. Secondary outcomes include diagnosis of hydrocele with receipt of a scrotal ultrasound, and receipt of a scrotal ultrasound. Additional analyses will compare surgical approaches.
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Hydrocelectomy
Timeframe: Follow-up period (index date to outcome, emigration, or maximum follow-up date [March 31, 2025]).