Renal & Urology

An abrupt fall in kidney function classified by where the insult sits (before, within or beyond the kidney) because that anatomical logic dictates both the cause and the immediate treatment.

Age- and androgen-driven hyperplasia of the prostate's periurethral transitional zone that mechanically narrows the urethra, producing a predictable split between voiding and storage symptoms as the bladder first compensates and then fails.

A urothelial field-change cancer, usually driven by carcinogen exposure across the whole urinary tract lining, that classically bleeds painlessly because early tumours are superficial and have not yet invaded pain-sensitive tissue.

A progressive, irreversible loss of nephron mass staged by filtration (eGFR) and by damage (albuminuria), in which the surviving nephrons' compensatory hyperfiltration itself accelerates the decline.

Immune-mediated inflammation of the glomerulus that damages the filtration barrier in a pattern-specific way, producing either a nephritic picture of blood and inflammation or a nephrotic picture of protein leak, depending on where and how the immune injury occurs.

Severe damage to the glomerular filtration barrier that leaks protein rather than blood, producing a self-reinforcing triad of proteinuria, hypoalbuminaemia and oedema plus a prothrombotic, infection-prone state.

An androgen-driven adenocarcinoma that arises mainly in the peripheral zone of the prostate, away from the urethra, which is why it grows silently for years before causing symptoms and why PSA screening is imperfect.

Sudden ureteric obstruction by a stone that raises pressure upstream and triggers smooth muscle spasm, producing pain whose exact location tracks the stone's position as it migrates towards the bladder.

Twisting of the spermatic cord that first occludes venous return and then arterial supply, producing an ischaemic time bomb in which every hour of delay costs testicular viability: a clinical diagnosis demanding immediate surgical exploration.

Infection of the normally sterile urinary tract, usually by ascending gut bacteria, whose site of infection (bladder versus kidney) and host factors dictate how it presents and how aggressively it must be treated.