<prompt> A six yr. old female presents with constipation and urinary retention. On examination a presecral mass is noted. Most probable dignosis isPelvic neuroblastomaRectal duplication cystSacrococcygeal teratomaAnterior Sacral meningocele  <response>: .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 