Pervious Urachus in Calves - A Report of Three Cases

During prenatal life, urinary bladder communicates with allantois through a structure known as urachus which becomes atrophied and its lumen gets cicatrized after parturition (Laverty and Salisbury, 2002). Partial or complete failure of lumen obliteration of this structure results in different anomalies like pervious urachus where complete length of urachal lumen fails to obliterate (Langan et al., 2001); urachal diverticulum, where the lumen of urachus fails to obliterate nearer to the bladder (Remedios et al., 1994); umbilical fistula where the lumen of Urachus fails to obliterate nearer to umbilicus and urachal cyst where the middle part of urachus remains patent (Lischer et al., 1994).