A six yr. old female presents with constipation and urinary retention. On examination a presecral mass is noted. Most probable dignosis is

.meningocele It is the herniation of meninges through a weak point of spine where bony fusion has not taken place effectively. Swelling is covered with pia mater and arachnoid mater without dural covering and contains CSF. Clinical Features - * Present since bih. * Soft, cystic, fluctuant with transillumination. * Signs of compressibility. * Expansile impulse when asked to cough or when child cries. Location * Lumbosacral - commonest. * Occipito cervical - 2nd most common. ref:SRB&;s manual of surgery,ed 3,pg no 1053