[Cystic dysplasia of the testis].

Cystic dysplasia of the testis is an exceptional benign tumour resulting from a functional abnormality of the connection between the rete testis and the efferent ductules of the epididymis. The authors report a new case observed in a child. The frequent association with a renal abnormality is highly suggestive. Treatment usually consists of orchidectomy, but can be conservative with long-term surveillance. The prognosis is usually excellent.