<prompt> Cobble stone appearance on Barium enema of a neonate is a feature of?Hirschsprung diseaseAnorectal malformationMucoviscidosisPatent allantois  <response>: Hirschsprungs disease Aganglinosis Cobble stone appearance on Barium enema of neonate At Rectosigmoid Junction Dx- Gastrogaffin enema-Retention of contrast in distal pa of colon Screening test- Rectal manometry. IOC - Biopsy Rx - Svenson Duhamel procedure Anorectal malformation cannot be detected on Barium enema Patent allantois causes urachal Fistula not dx on Barium enema Mucoviscidosis -presentation of cystic fibrosis HO meconium ileus: 