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Figure 2: Type AI of Sampaio's classification. Type AI – Two major calyces from superior and inferior poles with middle zone drainage dependent into any one of them or both. (a) Middle zone drainage into the upper pole major calyx. (b) Middle zone drainage into lower pole major calyx. (c) Middle zone drainage into both upper and lower pole major calyces

Figure 2: Type AI of Sampaio's classification. Type AI – Two major calyces from superior and inferior poles with middle zone drainage dependent into any one of them or both. (a) Middle zone drainage into the upper pole major calyx. (b) Middle zone drainage into lower pole major calyx. (c) Middle zone drainage into both upper and lower pole major calyces