Abstract
Whitaker has suggested a practical and useful defi - nition of urinary tract obstruction: “A narrowing of the urinary tract, such that the proximal pressure must be raised to transmit the usual fl ow through it” (Whitaker 1978b). The key factor of obstruction is blockade of urine fl ow, which leads to increased pressure in the collecting system.
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Smayra, T. et al. (2003). Ureteral Obstruction. In: Joffre, F., Otal, P., Soulie, M. (eds) Radiological Imaging of the Ureter. Medical Radiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55831-3_4
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