嚢胞状腎癌の4例

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RCC(嚢胞状腎癌)4例中1例(第2例)は単純嚢胞型,3例(第1,3,及び4例)は多房性嚢胞型であった.全例術前にCT及び血管造影を含むX線的検査により悪性新生物と診断した.病理学的検査により原因は第1,3,及び4例では内因性嚢胞状発育,第2例では腫瘍壊死の結果としての二次的嚢胞形成と思われた.第1,2,及び4例では根治的腎摘除,第3例では腎部分切除を行ったWe report 4 cases of cystic renal cell carcinoma (RCC), one of simple cystic type (case 2) and three of multilocular cystic type (case 1, 3 and 4). All cases were diagnosed preoperatively as malignant neoplasms on the basis of radiological examinations, including CT scan and angiography. Pathological examination revealed that intrinsic cystic growth was the probable cause in the three cases of multilocular cystic RCC, while the simple cystic case was probably caused by secondary cyst formation as a result of tumor necrosis. Radical nephrectomy was performed in cases 1, 2 and 4 and partial nephrectomy in case 3. We recommend nephron-sparing surgery as an option in the management of select cystic RCC, given that many cystic RCCs are low grade and enveloped by distinct pseudocapsules with fibrous tissues.