11.6 x 9.9 cm large heterogeneous mass involving right ovary."is the result of ultrasound test.is it cancer?

Possibly: ..But not necessarily. You will certainly need to have this investigated, so push for a consultation with a gynecologist. Good luck.

Not necessarily: Heterogenous ovarian masses can be caused by a variety of benign and malignant causes. Often an ovarian mass of that size would warrant removal and complete pathologic examination to rule out malignancy.