Imaging classification of ovarian tumors: plasmacytoma and cystic adenoma, mucinous cystic adenoma and cystic adenocarcinoma, solid and solid ovarian tumors, benign cystic teratoma and hypofibrotic teratoma, and metastatic ovarian cancer. Clinical manifestations of ovarian tumors: lower abdominal distension, menstrual disorders (tumors with endocrine function), abdominal pain (rupture or torsion), pressure symptoms (such as pressure on the transverse septum that causes respiratory distress), cachexia (emaciation, anemia, failure, etc.). Signs of ovarian tumor: A. Intra-abdominal masses: small ones need to be found by double diagnosis, and large ones can be palpated in the abdomen. Large ones can be palpated in the abdomen. Huge ones are mostly seen in mucinous adenomas or carcinomas with multiple rooms. B, ascites symptoms: malignant signs, but benign fibroadenoma can also appear. Malignant ones are mostly hemorrhagic. C. Endocrine symptoms: such as hirsutism, clitoral hypertrophy, thickening of voice as ovarian masculinizing tumor, and postmenopausal menstrual flow may be granulosa laminar cell tumor. Case: A female, 42 years old, was admitted to hospital with sudden onset of abdominal pain for 12+ hours. Complaint: lower abdominal distension without significant abdominal pain and no significant history of menopause. She was treated as an appendicitis infusion in the emergency department on the previous night, and an ultrasound examination of the appendix was performed in the early morning of the second day. Ultrasound examination of the appendix showed that there was a little fluid in the intestinal space around the appendix and in the lower abdominal cavity, but no abnormality in the appendix, and there was no pain with the pressure of the probe. Ultrasound examination of the uterine adnexa showed a solid mass in the right adnexal region, with a size of about 6.3cmx5.8cm, poorly defined borders and uniform internal echogenicity, and color Doppler (CDFI) showed that the internal edges of the mass could be detected and patchy blood flow signal. As shown in the figure, the postoperative pathology of the patient suggested: plasmacytic adenocarcinoma. n Plasmacytic adenocarcinoma is the most common type of ovarian malignancy, and half of the cases are bilateral. Typically, it should be multi-housed, with a lumen filled with papillae, often with infected bleeding, cloudy cystic fluid, and papillary growth of the tumor. The malignant form is complex. This patient case is atypical.