1/46. Establishment and characterization of human immature teratoma cell line (TES-1).A new human immature teratoma cell line, TES-1, was established from a surgical specimen from a 12-year old male with third ventricular immature teratoma. TES-1 shows polygonal morphology rich in neurites, and proliferated as adherent monolayer, with an approximate population doubling time of 48 hours. Electron microscopic analysis revealed the presence of swollen rough endoplasmic reticulum, and prominent lipid droplets, lysosomes and microfilaments. The chromosome numbers were between 41 and 160 (mode 78), including abnormal karyotypes 1p-, 5q-, 12p and 17p (G-band analysis). Hetero-transplantation of TES-1 into BALB/c nude mice produced no visible tumors. Multipotential differentiation was not induced in TES-1 monolayer culture, but significant neuron specific enolase activity was expressed in both extracellular (by RIA method) and intracellular fractions (by immunohistochemical method), suggesting the differentiation toward neurocytes. This cell line provides a useful in vitro model for the pathophysiological analysis of immature teratoma.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
2/46. rhabdomyosarcoma in a patient with mosaic klinefelter syndrome and transformation of immature teratoma.A 27-year-old man was found to have a mediastinal tumour and the histological diagnosis was immature teratoma. Remission was achieved by chemotherapy and total resection. However, he developed anaemia and leukoerythroblastosis after 2 years of remission, and was referred to our hospital. rhabdomyosarcoma cells were detected in the bone marrow and pleural effusion. Moreover, karyotype analysis of peripheral blood and bone marrow cells revealed mosaic-type klinefelter syndrome. We diagnosed the case as transformation of teratoma into rhabdomyosarcoma in klinefelter syndrome. Although intensive chemotherapy was performed, the patient died with meningeal infiltration.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
3/46. A case of klinefelter syndrome with retroperitoneal teratoma.klinefelter syndrome (KS) is often associated with various neoplasms, especially germ cell tumors. mediastinum is the most favored site of extragonadal germ cell tumors with KS, which is somewhat different from those without KS. The retroperitoneal germ cell tumor in KS is very rare. A five-month-old boy with an abdominal mass was found to have a retroperitoneal tumor. After surgical removal, he was diagnosed to have mature cystic teratoma. Cytogenetic study of his peripheral lymphocytes revealed that his karyotype was consistent with KS. This case suggests that patients with KS might be at risk of having germ cell tumors in sites other than mediastinum. It also suggests that all cases with these tumors should be screened for the presence of karyotypic abnormalities, and it might help to assess the exact correlation between germ cell tumors and KS, and to treat them accordingly.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
4/46. Chromosome analysis and comparison of the benign cystic and malignant squamous component of an ovarian teratoma.teratoma, the most common ovarian germ-cell tumor, presumably arises from a single germ cell and is composed of tissues representing all germ layers (ectoderm, mesoderm, and endoderm). Benign cystic teratomas (dermoid cyst) represent over 95% of ovarian teratomas and are comprised of entirely mature adult tissues. When malignant, almost all mature teratomas contain squamous carcinoma. We report for the first time the karyotypic comparison of an ovarian teratoma in a 36-year-old female with tissue separately taken from the benign cystic and malignant squamous components. The malignant squamous component revealed two distinct karyotypic populations: one diploid and the other polyploid. Both, however, demonstrated two common markers. The polyploid population also demonstrated numerous additional abnormalities with multiple copies of chromosome 20. Though many of the chromosomal aberrations were unique to the benign component, several karyotypes showed the same markers noted in the malignant squamous component. The significance of this finding is that it may serve to identify those histologically benign teratomas destined to undergo malignant transformation.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
5/46. Persistent mullerian duct syndrome with teratoma in an ectopic testis: imaging features.The persistent mullerian duct syndrome represents a rare form of male pseudohermaphroditism, secondary to mullerian inhibiting factor (MIF) deficiency. We describe imaging findings in a 30-year-old male (46 XY karyotype) with bilateral cryptorchidism and mullerian duct anomalies (presence of uterus and fallopian tubes). Grade-III teratoma with yolk sac tumour was detected in one of the undescended testis, lying in the pelvic cavity. The other testis was in the inguinal canal. The rest of the wolffian duct structures (e.g. prostate, seminal vesicles) were nearly normal. Very few reports of imaging findings of this entity have been published thus far, probably because of the rarity of entity, incidental detection of most of the cases at surgery and relatively asymptomatic clinical presentation.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
6/46. Biovularity and "coalescence of primary follicles" in ovaries with mature teratomas.Several theories have been postulated regarding the origin of ovarian teratomas, including incomplete twinning, neoplastic proliferation of sequestered totipotent blastomeres or primordial cells, derepression of totipotent genetic information in the nuclei of somatic cells, and parthenogenetic development of germ cells. At present parthenogenetic development of ova is the most widely accepted theory, primarily because of the presence of a 46 XX karyotype in almost all mature teratomas. However, some authors have raised the possibility of fusion of ova in the mechanism of formation of ovarian teratomas. We report the results of a study on ovarian tissue adjacent to 31 teratomas to assess the frequency of biovularity, which could provide evidence favoring the last theory. On the whole we found biovularity in 26 ovaries of young patients (mean age, 27 years) with variable numbers of biovular follicles ranging from 1 in 4 cases to more than 10 in 2 cases; the number of biovular follicles depended on the quantity of ovarian tissue examined as well as on the total number of ova in the tissue. In multiple occasions 2 ova were included within a single follicle; in 24 ovaries the biovularity was correlated with coalescence of primary follicles characterized morphologically by an ovoid or hourglass-like shape that resulted from cohesion of 2 follicles. As control cases, 30 ovaries of patients with an average age of 28 years were examined (12 removed for endometriosis, 8 for serous cystadenoma, 7 for tubal pregnancy, and 3 for acute salpingo-oophoritis). Only 1 ovary with endometriosis contained a single biovular follicle. The results suggest that ovarian teratoma development may result from fusion of ova in ovaries containing biovularity and phenomena of coalescence of primary follicles.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
7/46. Comprehensive cytogenetic evaluation of a mature ovarian teratoma case.Mature ovarian teratomas are benign ovarian germ cell tumors that usually present with a normal karyotype. There are very few reports describing chromosomal abnormalities in these tumors, none of which are recurrent. In this study we report on a mature teratoma case with clonal chromosomal alterations which include monosomies of chromosomes 6, 14, 16, and 21; trisomies of chromosomes 14 and 21; and deletions of Xq, 5p, 16p, and 17p. comparative genomic hybridization evaluation of the sample revealed a normal profile. These findings are discussed together with the cytogenetic reports on other cases of ovarian teratomas described in the literature.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
8/46. Congenital mediastinal immature teratoma: a case report with autopsy findings.A full-term newborn with karyotype 46, XX was delivered by cesarean section. She had severe respiratory distress and substernal retraction, and underwent emergency operation, but she died on the same day due to respiratory failure. The mother, 26-year-old prima gravida with no history of twinning, had been examined with ultrasonography at the 34th week of her pregnancy, which revealed a fetus with edema of head and neck region, a probable diaphragmatic hernia, polyhydramnios, and a large mediastinal mass with solid and multicystic parts with hypoplasia of the lungs. autopsy revealed a 9 x 5 x 3 cm lobulated mediastinal mass with both solid and cystic areas, displacing the lungs and the heart postero-inferiorly and thymus anteriorly. The lungs were hypoplasic. Microscopically, the mass showed mature epithelial and mesenchymal tissues with primitive mesenchyme and immature neuroepithelium. All these findings led to the diagnosis of an immature teratoma. Mediastinal teratomas are rare and life-threatening, but early diagnosis and surgical intervention in a newborn with sufficient lung maturation may provide a long survival.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
9/46. Mediastinal immature teratoma with yolk sac tumor and myelomonocytic leukemia associated with Klinefelter's syndrome.A 14-year-old male presenting with a short history of right subclavicular chest pain was found to have a mediastinal tumor. Hematologic investigations and bone marrow examination showed features of myelomonocytic leukemia. The mediastinal tumor was excised, but the surgery was complicated by massive hemorrhage. The patient's condition deteriorated postoperatively and he died a week later. The histology of the mediastinal tumor showed the typical features of an immature teratoma with a yolk sac tumor. A prominent infiltrate of leukemic blast cells was present within blood vessels and in close proximity to the yolk sac component. The karyotypic analysis of leukemic cells isolated and cultured from the bone marrow showed 50XXY, 8, 21, iso G-group marker chromosome karyotype.- - - - - - - - - - ranking = 1keywords = karyotype (Clic here for more details about this article) |
10/46. Germ cell neoplasms in three intersex patients with 46,XY karyotype.This report presents 3 cases with gonadoblastoma mixed with other germ cell tumours in intersex patients, all with a 46,XY karyotype. One 11-year-old patient was a true hermaphrodite, the others, aged 13 and 18, respectively, had both gonadal dysgenesis. Different clinical courses have been noted. Two patients had gonadoblastoma combined with dysgerminoma; in one of them a teratoma was also found. In the third case gonadoblastoma was transformed into teratocarcinoma. The malignant degeneration was more serious in the 2 pubertal patients. Thus, we recommend early and prophylactic gonadectomy.- - - - - - - - - - ranking = 5keywords = karyotype (Clic here for more details about this article) |
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