Mixed epithelial and stromal renal tumour in a 12-year-old boy.

Mixed epithelial and stromal tumour of the kidney (MESTK) is a rare kidney neoplasm that occurs almost exclusively in perimenopausal women. Long-term oestrogen replacement appears to play a major role in its pathogenesis. Around 70 cases have been described in the international literature, none of which involve male children.

Thoracoscopy and solid tumors in children: a multicenter study.

Purpose: The aim of this study was to evaluate the efficacy and safety of thoracoscopy in the treatment of solid thoracic tumors in children.

Methods: A retrospective, multicenter review of 139 thoracoscopies was performed. The procedures were either resection of pulmonary lesions or biopsy.

[Polyorchidism in child (a case report and review of literature)].

Polyorchidism is an urogenital curiosity defined by the presence of more than two testes confirmed by histology. This anomaly is extremely rare and only a hundred world cases were described in the literature. Although it can remain asymptomatic, polyorchidism is often associated to processus vaginalis anomalies in childhood (hernia, hydrocele) and undescended testis.