A 35-year-old female patient consulted a dentist about a painless, slowly growing neoplasm in the region of the 11 and 12 teeth. Examination revealed that the tumour was light-pink, flat, adjacent to the teeth, had a pedicle. The tumour was up to 1,5 cm large, with smooth surface and dense consistency. It was diagnosed as an epulis in the region of the 11 and 12 teeth. What form of epulis are these clinical findings typical for?