Cystic dysplasia of rete testis with ipsilateral renal agenesis.

Background. - Cystic dysplasia of rete testis, a rare abnormality, is often associated with renal agenesis. Case report. - A 5-year-old boy was examined because he presented large scr otum. This was initially considered as hydrocele. Surgery showed a cystic d ysplasia of the testis that in this patient was associated with ipsilateral renal agenesis. Conclusion. - This congenital abnormality explained on the basis of embryol ogical development, has been reported in 15 children. The testis appears cy stic at surgical exploration; echography can affirm diagnosis and MRI can g ive specific features. A conservative attitude is proposed as this lesion i s benign. Long-term follow-up is recommended for possible painful effects o r growth of the lesion. (C) 1999 Elsevier, Paris.