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Epidermoid carcinomas account for 9 to 17% of primitive pyelocaliceal tumours. Key predisposing factor are infections and lithiasis, pre-operative diagnosis being difficult due to insidious growth and absence of pathognomonic syndrome. The paper introduces one case of epidermoid pyelocaliceal carcinoma where diagnosis was supported by intravenous urography, ultrasound and CAT, and where the catheter-obtained cytology was definite in terms of diagnostic value. Ureteropyeloscopy can be a crucial examination in case of diagnostic doubt. Choice therapy is nephroureterectomy with vesical collar resection when the tumour's anatomical state or the subtotal nephrectomy allow it. Prognosis of these tumours is very poor, mean survival of patients being of about 4 months. Our patient died one month after surgery.

Bellini's collecting ducts carcinoma represent a subgroup within renal carcinoma with an incidence of 0.4 to 2% of all renal tumours. The collecting ducts share their embryological origin in Wölf's duct with the calices, renal pelvis and ureter. This common embryological origin could justify the association of carcinoma originated in the collecting ducts with transitional urothelial carcinoma. This paper contributes two patients with Bellini's collecting ducts carcinoma associated to "in situ" carcinoma and transitional papillar carcinoma in the adjacent renal pelvis respectively. The authors review the diagnostic, pathoanatomical and therapeutical aspects found in the literature. A high index of suspicion is required to diagnose a case of Bellini's carcinoma in the face of predominantly central-medullar renal solid lesions, with infiltrating growth that causes morphological changes in the excretory system without deforming the external renal outline. The authors highlight the value of immunohistochemical studies to reach a diagnosis, considering the natural history and the sombre prognosis of this uncommon renal neoplasia.

The purpose of this paper is to report one case of left pyelic Wilms' tumour in a 17-year old male patient. Pre-operative diagnosis was complicated by a background of prior surgery on the same kidney due to a benign fibroepithelial polyp. The possible concomitences are analyzed while the relevance of an extensive pathoanatomical study to avoid possible diagnostic errors is emphasized.

The paper presents the results obtained from a study of 28 patients with high urothelial tumour, treated with radical surgery (total nephroureterectomy). Multivariable study of survival rates (Cox models) indicates that cellular differentiation is the most significant prognostic factor. Single variable study indicates that tumour stage has some significance mainly due to the large relationship to the degree of cellular anaplasty.