Gross findings of the lower pole in CSM group and ESM group on D2, D7 and D28 after the operation. On D2 after the operation, both CSM group (A) and ESM group (D) presented with renal necrosis and stasis in the lower segment, and exudation in the right renal capsule, and swollen in the right kidney. On D7 after the operation, both CSM group (B) and ESM group (E) presented with swollen, renal capsule adhesion, necrosis, atrophy, and exudation in renal capsule. On D28 after the operation, both CSM group (C) and ESM group (F) presented with decrescent, yellowing, firm, and uneven surface of the lower pole. CSM, CalliSpheres microspheres; ESM, Embosphere microspheres.