A 31-year-old female patient with regular menstrual cycles, who had her last menstrual period on January 20, 2022 and whose vaginal bleeding continued until March 08, 2022, applied to the obstetrics outpatient clinic. Detailed system examination does not show any problems. She has a cesarean section on her resume. Beta-human choriogonadotropic hormone (beta HCG) value is 39 mlU/ml. After the beta HCG value is detected as 39 mlU/ml, the anamnesis is deepened. In the previous clinic, the patient was performed with pelvic computerized tomography (CT). In contrast-enhanced pelvic CT, an uterine mass lesion, which may originate from the endometrial cavity, which significantly thins the myometrium, shows significant contrast material uptake, and contains internal thick septa structures, was observed. The mass lesion described was primarily thought to be of a malignant nature. At that time, beta HCG measurements made with two-day intervals were 959 mlU/ml and 713 mlU/ml (Table 1). Hence, hysterectomy is recommended to the patient in previous clinic. The patient does not accept the surgery and applied to the our clinic in the university hospital. In the vaginal USG, the endometrium was observed irregularly, and hyperechoic and hypoechoic lesion areas were observed in the uterine cavity (Figure 1A). Based on pelvic CT findings, F-18 FDG PET/CT is performed on the patient due to the suspicion of a malignant mass. Since the beta HCG value was found to be 3.41 the day before, it is thought that the patient is not an active pregnancy and PET/CT examination is performed. In F-18 FDG PET/CT, metabolic activity is not detected in the area of the mass lesion in the uterus and the defined lesion is thought to be primarily benign (Figure 2). Tumor markers were normal (CEA:0,82 ug/L, CA 19-9: 2 U/ml, CA 15-3: 17,8 U/ml, CA 125: 19,9 U/ml). In addition, it is stated in pelvic MRI that the lesion in the uterus does not show malignant features, and may primarily be hematoma, hemorrhagic cervical pregnancy or degenerated cervical myoma. In the light of all examinations, curettage is applied to the patient. In the pathological examination, endometrium and degenerated villi structures showing decidualization signs between the areas of widespread bleeding and necrosis were observed, and Beta HCG (+) is detected immunohistochemically in the trophoblastic cells around these villi. Pathological diagnosis is expressed as the product of intrauterine pregnancy. In the control vaginal USG performed one month after the endometrial biopsy, no lesion was observed (Figure 1B). It was thought that pregnancy products were spontaneously resorbed and excreted through the vaginal route.