A pericaliceal haemangioma associated with papillary necrosis caused haematuria which led to nephrectomy. Seven similar vascular lesions were found on review of the surgical histopathology records from the last 25 years at the St Peter's Hospitals, Institute of Urology, London. In 4 of these there was histological evidence of damage to the renal papilla adjacent to the vascular abnormality; a possible mechanism for these changes is discussed. In all 8 cases the patients presented with haematuria and, in 5, abnormalities were seen on renal radiological investigation. Nephrectomy was performed in 5 instances and the remaining 3 patients were treated by partial nephrectomy. The presence of a vascular malformation was considered pre-operatively in 2 patients and in the remainder the diagnosis was first made on laboratory examination. In all patients haematuria ceased post-operatively and in 5 cases where follow-up information was available there has been no evidence of bilateral involvement.

SUMMARY The glandular acid phosphatase in a series of thirty benign and two cases of malignant enlargement of the prostate was estimated. Wide variation was discovered and the malignant glands were found to contain much less enzyme than the benign. The same glands were stained for acid phosphatase by Gomori's method Acid phosphatase was demonstrated in all. The histology of these sections is described and illustrated. An explanation is submitted for the wide variation in the figures for the benign glands and for the low ones in malignant glands.

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SUMMARY A case of Fenwick's ulcer of the bladder is described. The symptomatology, aetiology, and treatment of this condition are discussed. I am indebted to Dr M. E. Sharp, B.Sc, L.R.C.P., M.R.C.S., for the description of the morbid histology.