Endometrial Stromal Tumours are rare mesenchymal neoplasms of the uterus, the cells of which resembles stromal cells of proliferative endometrium. Grossly, most common appearance of Endometrial Stromal Nodule is a circumscribed solid mass. We report a case of Endometrial Stromal Nodule which has undergone complete cystic degeneration and has acquired a unilocular tender coconut-like cystic appearance which is very unusual.