[Multilocular cystic nephroma in children. Description of a case]

In paediatric age there may occur the various types of cystic renal tumor also of different clinical meaning; we can count among them shapes openly or potentially deadly, among which Wilms tumor cystic owing to haemorrhages and tumoral necrosis, congenital mesoblastic cystic nephroma, clear cell carcinoma, cystic, partially differentiated nephroblastoma (CPDN) and benign forms such as multilocular cystic nephroma (MLCN), cystic localized dysplasia of the kidney. In some cases, the differential diagnosis is difficult and it becomes only by histology: particularly the differential diagnosis between MLCN and CPDN, indistinguishable on the basis of the imaging and the macroscopic aspect, it is possible only by histology. It is described a case of multicystic lesion in a baby, male, aged twenty-two months, with an indolent mass of left side, screened by US and TC. The US examination has put into evidence the presence of renal with clean outlines of eight cms, formed by multiple small cysts, divided by thin regular septa . These aspects have been confirmed by TC. The histological examination has diagnosed a multilocular cystic nephroma, without atypias. Therefore, the multilocular cystic lesions of the kidney have to be considered potentially malignant and submitted to surgical treatment.