MKI67 and cyst: Z tests revealed no statistical difference between C/T ratio and tumor volume (ZKi67 = 1.001, PKi67 = 0.136; Znuclear atypia = 0.237, Pnuclear atypia = 0.813) or between tumor volume and cyst volume (ZKi67 = 0.297, PKi67 = 0.767; Znuclear atypia = 0.891, Pnuclear atypia = 0.373) in predicting Ki67 index and nuclear atypia, but C/T ratio had a higher predictive value than cyst volume (ZKi67 = 2.975, PKi67 = 0.003; Znuclear atypia = 2.469, Pnuclear atypia = 0.014).