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When a calculus travels from the renal pelvis into the ureter, complete or partial ibstruction result, with characteristic accompanying symptoms. The predominant feature is colic, usually an acute event leading to early medical intervention. As the colic subsides the aim of further treatment becomes the reduction of obstruction, be it by conservative drug therapy, by instrumention or by the surgery. Where shape, level and size of the stone are favorable, specific conservative therapy will result in spontaneous passage in about 60–90% of cases (BACH et al. 1983; BANDHAUER 1970; MADERSBACHER et al. 1975; SCHNEIDER 1985; VAHLENSIECK 1970, 1973; VAHLENSIECK and BASTIAN 1973). Any conservative treatment of ureteric colic or to promote spontaneous passage should be founded on pathophysiological understanding of the obstructed ureter.