<unk>  usually is an adenocarcinoma (about 90%) mostly with mucinous/colloidal histology. Other rare types include urothelial carcinoma, squamous cell carcinoma, neuroendocrine carcinoma and sarcoma.
Urachal cancer
Rectovestibular fistula
Urachal cyst
Urachal fistula
Vulvar vestibulitis
Cimino fistula
Haemolacria
Pilonidal disease