Excerpt from Surgical Diseases of the Kidney and Ureter Including Injuries, Malformations and Misplacements, Vol. 2 of 2
Besides the cases of tumours commencing in the capsule, in the parenchyma, or in the sinus of the kidney, and which in process of growth extend into the renal cavity, there are others which unquestionably have had their point of departure in the renal calyces or pelvis.
Tumours of Epithelial Origin.
Pathology. - Carcinoma, myxoma, myxo-sarcoma, lymphatic endothelioma, myo-sarcoma, rhabdo-myoma, as well as papilloma, have each been met with as tumours primarily originating in the pelvis of the kidney, but simple papilloma and epithelioma are the two most common forma of new growth which commence therein.
Not unfrequently the tumour, whether benign or malignant, extends into the ureter. Albarran, in a recent and comprehensive article based on an analysis of forty-two cases of neoplasms of the renal pelvis and ureter, states that eighteen out of the forty-two cases were papillary growths and thirteen non-papillary epitheliomata. In the former group he includes all growths of epithelial origin which have villous structure, hence they are not all of them simple benign papillomata. In six of the eighteen villous tumours and in five of the thirteen non-papillary epitheliomata, the growths were confined exclusively to the renal pelvis and calyces, and did not extend into the ureter.
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