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1. This is embryonal carcinoma mixed with teratoma.

2. Methods Clinical data of nine children with gastric teratoma were retrospectively analyzed in hospitalization from 1986 to 2002 period.

3. The benign teratoma as seen from pathological reports with upward AFP, should be checked very carefully to assure there were endodermal sinus tissue in teratoma tissues or not.

4. This neoplasm microscopically contained mainly teratoma, but areas of embryonal carcinoma were also present.

5. Result To study patients, 20 immature teratoma (IT), 11 endodermal sinus tumor, 8 dysgerminoma, 6 mixed germ cell tumors.

6. There are four histological subtypes of nasopharyngeal teratomas –dermoid, teratoid, true teratoma, and epignathic – of which the dermoid subtype comprises the majority.

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7. Here is a testicular neoplasm that is teratoma, but embryonal carcinoma and seminoma were found microscopically.

8. Spontaneous rupture of a huge mediastinal teratoma into the pleural cavity causing dyspnea is rare. A 14-year-old female presented with acute onset of severe chest pain, chills, fever, and dyspnea.

9. Since the mediastinal teratoma has no specific symptoms, its definite diagnosis is difficult before surgical intervention.

10. The residual cells were able to form teratoma at the injection site, and mature endoderm, mesoderm and ectoderm tissues could be found in teratoma tissues.

11. Since mediastinal teratoma has no specific symptoms, its definite diagnosis is difficult before surgical intervention.

12. A primary retroperitoneal teratoma a relatively rare disease in adults.

13. The accurate rate of frozen section for adolescent teratoma is lower.

14. However, a mediastinal teratoma is rarely considered in a patient presenting with hemoptysis.

15. Dermoid cyst and teratoma were mixed in different degree with fat, calcification and skeleton.

16. There were ovarian cyst in 4, ovarian teratoma in 7, malignant ovarian cyst in 1, corpus luteum rupture in 3, imperforate hymen in 2, pelvic inflammation in 2 and primary dysmenorrhea 1.

17. Struma ovarii is a rare form of mature teratoma of the ovary .

18. Mothods: 17 patients with ovarian benign teratoma were treated with operative laparoscopy.

19. Objective To explore the diagnosis, treatment and prognosis of gastric teratoma in young children.

20. Objective To investigate the diagnosis, treatment and prognosis of gastric teratoma in neonate.

21. Objective To explore the B - ultrasonographic features of mature teratoma of ovary.

22. Conclusion The B - ultrasonography has important value to diagnose the mature teratoma of ovary.

23. A 13 - year - old boy with rupture of retroperitoneal teratoma due to blunt abdominal trauma is presented.

24. They often have several histologic components: seminoma, embryonal carcinoma, teratoma, choriocarcinoma.

25. Results:17(34%)of 50 cases of mediastinal tumors showed returned pleural line. 39(78%) of them were thymoma, teratoma, retrosternal thyroid, and neurogenic tumor.

26. Their tumor pathologies included benign or malignant thymoma and teratoma.

27. Results The incidence of the struma ovarii was 3.75% in mature teratoma of ovary. The clinical features were non-specific pelvic tumor or no symptom found in the patients in physical examination.

28. The first differential diagnosis has to be struma ovarii, which is a monodermal ovarian teratoma that is usually cystic.

29. We report herein a case of hemoptysis caused by a mediastinal teratoma with pulmonary involvement.

30. Purpose : To analyse the CT imaging characters of intracranial teratoma.