94 65 歲男性因快速腎功能變壞及少尿(oliguria)來就醫。檢查發現高血鈣、頭骨局部溶骨性病變(skull osteolytic lesion)以及骨髓含有不正常漿細胞(abnormal plasma cells＞40%)。腎病理檢查最可能的發現是: (A) glomerular crescent formation (B) segmental glomerular necrosis (C) diffuse tubular dilation and pigmented casts (D) fragile tubular casts surrounded by giant cells