FOXF1 with at least one causal gene was implicated through Duodenal Stenosis (HP:0100867, q = 1.776x10-2), Small Intestine Stenosis (HP:0012848, q = 1.776x10-2), Abnormality of the Duodenum (HP:0002246, q = 2.244x10-2), Intestinal Malrotation (HP:0002566, q = 3.521x10-2) and Hydronephrosis (HP:0000126, q = 3.521x10-2). This evidence concerns the gene FOXF1 and hydronephrosis.