In this case Two Ducts emerge from anterior border of Parotid gland instead one one. These ducts pass over masseter muscle and unite near its anterior border to form a single duct which after piercing buccinator  opens into vestibule. we found this Y- shaped pattern during dissection of a cadaver on Right side. on the left side of same cadaver the antaomy of parotid duct was normal. we published this article in International journal of Basic and Applied Sciences (Sciencepubco) and named this duct as Itoo's duct after the  Sir name of  our first author.  Anotomical Knowlege of this duct is important for surgeons operating on parotid  because leakage from this duct can lead to delayed wound healing and fistula formation in this region.

I agree with Dr Mohd Saleem , it' anatomic varient where the glannd had 2 ducts emerging from it, then unite giving y shape appearance