Primary endometrial squamous cell carcinomas (PESCC) occur sporadically. It is defined as a primary carcinoma of the endometrium composed of squamous cells of varying degrees of differentiation. A 57-year-old female patient was referred to the gynaecological clinic of Faculty of Medicine, Universitas Indonesia, Dr Cipto Mangunkusumo National Referral Hospital because of abdominal enlargement with pain. Total hysterectomy and bilateral salpingectomy were performed. Histopathological examination confirmed a moderately differentiated squamous cell carcinoma, with lymph-vascular invasion. Two weeks after the operation, the patient complained of a mass on her left supraclavicular area. Fine needle aspiration biopsy revealed squamous cell carcinoma metastatic in nature. The recommended treatment was paclitaxel (175mg/m2) and carboplatin (AUC- 6), combined with pelvic radiotherapy.