Objective: Solitary fibrous tumour (SFT) can develop at any anatomic site, but in the kidney is described rarely. In general, SFT forms an unencapsulated solid mass. We report a case of a 57-year old woman with benign SFT of the left kidney. The tumour showed extensive pseudocystic change and mimicked renal cystic neoplasm. Method: A nephrectomy specimen showed cystic tumour beneath renal capsule and in peripelvic adipose tisssue. Histological sections were used for hematoxylin-eosin and for immunohistochemistry (antibodies against vimentin, smooth muscle actin, desmin, S-100 protein, CD117, CD99, bcl-2, CD34, CK18, AE1-AE3, EMA). Results: Microscopically the tumour showed uniform spindle cell proliferation with expansive tumour margins, without necrosis or hemorrhagies. Mitotic activity was 1 per 10 high power fields. Cystic spaces without epithelial lining contained eosinophilic proteinaceous fluid. Imunohistochemically tumour showed difuse positivity for CD34, CD99, bcl-2, vimentin and stained negatively for S-100 protein, cytokeratins, EMA, smooth muscle actin, desmin and CD117. Conclusion: SFT of the kidney is infrequent. Some renal SFT can undergo pseudocystic transformation and mimic renal cystic neoplasm both clinically and macroscopically. Objective: Renal angiomyolipomas are mesenchymal tumors that comprised of adipose tissue, smooth muscle like cells and abnormal thick walled blood vessels admixed in various proportions. Epithelial renal angiomyolipomas are rare variants and may exhibit atypia. In the literature epithelioid renal angiomyolipomas with atypia are reported to have malignant potential. Method: Left radical nephrectomy was performed due to renal mass with flank pain and hematuria. Results: In gross examination; 6.5×3.5×3 cm gray white mass with occasionally necrotic areas at the middle portion of left kidney renal sinus and perinephritic fatty tissue, macroscopically. Microscopic eveluation reveals; tumoral lesion comprised of adipose tissue, smooth muscle and blood vessels, showing areas of epitheloid morphology and moderate to severe degree of nuclear atypia. In addition to histomorphology positivity HMB-45 immunohistocemistry elaborated to the diagnosis of "epitheloid renal angiomyolipoma with atypia". Conclusion: This case has been presented due to its infrequent occurrence and malignancy potential.