“…The hypertensive effect of renal compression was first described by Page in 1939, when he produced hypertension in animals subjected to cellophane induced perinephritis. Since his description, thirty patients have been documented as having hypertension secondary to renal compression (Conrad er a/, 1976;Grant er al, 1971;Grim er al, 1975;Hellenbusch er al, 1970;Marshall and Castellino, 1971;Massumi er 01, 1969;Scott et al, 1976;Sos et al, 1973). Most cases have been due t o chronic subcapsular haematomas.…”