<unk>  is a very rare type of<unk>  arising from the urachus or its remnants. The disease might arise from metaplasic glandular epithelium or embryonic epithelial remnants originating from the cloaca region. It occurs in roughly about one person per 1 million people per year varying on the geographical region. Men are affected slightly more often than women mostly in the 5th decade of life but the disease can occur in also in other age groups. It can involve the urinary bladder, but is not bladder<unk>  in the usual sense.<unk>  can occur at any site along the urachal tract.<unk>  was mentioned by Hue and Jacquin in 1863 followed by an elaborate work by T. Cullen in 1916 about diseases of the umbilicus, while C. Begg further characterized<unk>  in the 1930s. Detailed diagnostic and staging schemes were proposed by Sheldon et al in 1984, which remain widely used today.
Urachal cancer
Rectovestibular fistula
Urachal cyst
Urachal fistula
Vulvar vestibulitis
Cimino fistula
Haemolacria
Pilonidal disease