Renal Hamartoma1

SUMMARY Five cases of renal hamartoma, two fibromas and three angiomyolipomas, successfully treated by nephrectomy, are reported, and their pathology, clinical features, and treatment described. The association of these renal lesions with tuberous sclerosis is discussed. We wish to acknowledge our indebtedness to Mr N. M. Matheson for permission to record Cases 4 and 5, which were under his care in Ashford Hospital, Middlesex, and to Professor R. A. Willis for his kind interest, encouragement, and advice. We also thank our hospital colleagues Dr A. Siedlecka and Dr W. F. Hamilton for their pathological reports on Cases 4 and 5: Dr N. Langdon‐Down for Fig. 9; Dr C. F. Ross for‐ Figs. 10. 11. and 12: and Dr J. A. Brocklebank for Fig. 21. The drawings are by Miss B. E. Nicholson:the photographs, and photomicrographs by Mr A. S. Carr. Mr P. Harrison. and Mr E. A. Targett.