Etiological determinants and pathogenetic mechanisms of hydrocele: a theoretical and evidence-based analysis

Abstract

Hydrocele is a pathological accumulation of serous fluid within the tunica vaginalis of the testis or along the spermatic cord, representing one of the most frequent benign scrotal conditions in male patients. Despite its clinical simplicity, the etiological spectrum and pathogenetic mechanisms underlying hydrocele formation are complex and multifactorial. The present article provides a comprehensive theoretical and evidence-based analysis of etiological determinants and biological mechanisms contributing to hydrocele development. Epidemiological data indicate that congenital hydrocele affects approximately 4–5% of full-term male neonates, while acquired forms constitute up to 1% of adult male urological consultations worldwide. The etiological factors range from persistence of the processus vaginalis and developmental lymphatic insufficiency in infants to trauma, infection, neoplasia, and systemic inflammatory conditions in adults. The pathogenesis is fundamentally associated with an imbalance between fluid secretion and absorption within the tunica vaginalis, mediated by mesothelial cell dysfunction, inflammatory cytokine activity, altered vascular permeability, and impaired lymphatic drainage. Recent molecular investigations highlight the role of vascular endothelial growth factor, interleukins, and nitric oxide pathways in increasing capillary transudation. Furthermore, chronic inflammation induces structural remodeling of the tunica vaginalis, perpetuating fluid retention. Understanding these mechanisms is essential for refining diagnostic strategies and improving therapeutic decision-making. This review synthesizes clinical, experimental, and theoretical evidence to elucidate the multifaceted biological processes underlying hydrocele formation.