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Renal cell carcinoma (RCC) is the most common type of kidney cancer in adults, accounting for approximately 85% of all renal malignancies. It typically arises from the proximal tubular epithelium and often presents with the classic triad of flank pain, hematuria, and palpable mass, though this complete triad is found in only 10-15% of cases.
RCC develops through genetic mutations affecting tumor suppressor genes, most notably the VHL gene in clear cell RCC, leading to dysregulated angiogenesis and cellular proliferation. The loss of normal cellular growth control mechanisms results in uncontrolled division of renal tubular epithelial cells, with subsequent invasion into surrounding tissues and potential metastatic spread through hematogenous and lymphatic routes.
Early-stage RCC is often asymptomatic and discovered incidentally on imaging studies, making systematic evaluation of renal masses crucial for timely diagnosis. Clinical suspicion should be heightened in patients with unexplained hematuria, persistent flank pain, or constitutional symptoms like weight loss and fatigue, particularly in those with risk factors such as smoking, hypertension, or genetic predisposition. Prompt imaging with CT or MRI and appropriate staging workup are essential for determining treatment options and prognosis.