ABSTRACT
The aim of the present study was to evaluate the cell proliferative activity, by AgNORs number, in different regions of bovine placenta throughout gestation. A total of 28 bovine placentas were separated into four groups: group I (60 to 120 days), group II (121 to 170 days), group III (171 to 220 days), and group IV (221 to 290 days). It was found a greater number of AgNORs in giant trophoblastic cells (GTC) when compared with mononuclear trophoblastic cells (MTC) (p<0,001) in all regions and gestational groups analyzed, that confirms their intensive synthesis activity in trophoblast epithelium. The central region of the placentome begins an intense proliferative activity in group II, observed by clusters, while placentomes edges showed a higher number of clusters on group III. These data suggest that the central region of the placentomes began an intense proliferative activity prior to its edge, both declines at the end of pregnancy. Interplacentomal area showed a higher number of AgNORs in the group IV, suggesting a higher proliferative activity of these cells at the end of pregnancy. The results of this study indicate that the proliferative activity, as determined by the amount of intranuclear AgNORs, exhibits patterns that are not only specific to each type of trophoblastic cells, but also for each specific region of bovine placenta throughout pregnancy.
Este estudo teve como objetivo analisar atividade proliferativa das células trofoblásticas, através da quantificação de AgNORs, em diferentes regiões da placenta bovina ao longo da gestação. Foram utilizados 28 úteros, sendo estes agrupados de acordo com as idades gestacionais: grupo I (60-120 dias); II (121- 170 dias); III (171-220 dias) e IV (221-290 dias). Foi encontrado um número significativamente maior de AgNORs nas células trofoblásticas gigantes (CTG) em relação às mononucleadas (CTM) (p<0,001) em todas as regiões e grupos gestacionais analisados, o que confirma sua intensa atividade de síntese no epitélio trofoblástico. A região central do placentônio inicia uma atividade proliferativa mais intensa já no grupo II, observada pelo número de clusters, enquanto que a margem do placentônio apresenta uma maior quantidade de clusters no grupo III. Estes dados sugerem que a região central do placentônio inicia uma intensa atividade proliferativa anteriormente a sua margem, ambas declinando no final da gestação. A área interplacentomal apresentou um maior número de AgNORs no último grupo gestacional, sugerindo uma maior atividade proliferativa dessas células no final da prenhez. Os resultados deste estudo indicam que a atividade proliferativa, determinada pela quantidade de AgNORs intranucleares, exibe padrões que são específicos não somente para cada tipo de célula trofoblástica, mas também para cada região específica da placenta bovina ao longo da gestação.
Subject(s)
Animals , Pregnancy , Cattle , Gestational Trophoblastic Disease , Trophoblastic Tumor, Placental Site/diagnosis , Trophoblastic Tumor, Placental Site/veterinary , Cell ProliferationABSTRACT
Placental site trophoblastic tumour (PSTT) is a rare form of trophoblastic disease accounting for < 2% of all gestational trophoblastic neoplasms. Most of the cases follow a normal pregnancy and a small number have a preceeding molar pregnancy or spontaneous abortion. It can occur as early as several weeks or as late as 15 years after normal delivery, molar pregnancy or abortion. Excessive intermediate trophoblastic activity is the most important diagnostic criterion of this tumour originating from non villous trophoblast. But the possibility of a PSTT should be considered when there is excessive intermediate trophoblastic activity despite the presence of chorionic villi as in the present case. This case report highlights the unusual features like rarity of the tumour (< 2%), occurrence following spontaneous abortion which happens only in a minority of cases, and presence of chorionic villi in the tumour despite the fact that the tumour is of non villous trophoblastic origin.
Subject(s)
Abortion, Spontaneous/pathology , Adult , Female , Humans , Pregnancy , Trophoblastic Tumor, Placental Site/diagnosis , Trophoblasts/pathology , Uterine Neoplasms/diagnosisABSTRACT
Placental site trophoblastic tumour is a rare form of gestational trophoblastic disease, which seldom metastasizes. It is chemoresistant though has an excellent prognosis after complete resection of the tumour. Its characterization is thus important for treatment and further management. We present an unusual case who presented with ascites of non-neoplastic origin and was found to have metastases to the lymph node.
Subject(s)
Adult , Ascites/etiology , Female , Humans , Lymphatic Metastasis , Pregnancy , Trophoblastic Tumor, Placental Site/diagnosis , Uterine Neoplasms/diagnosisABSTRACT
Placental site trophoblastic tumor is very rare. It is a gestational trophoblastic neoplasm which follows normal or molar pregnancy. It is usually confined to uterus & 15-20% behave in a malignant fashion. Clinically patients present with abnormal excessive bleeding or amenorrhoea. Though several trophoblastic lesions & tumors enter in the differential diagnosis, microscopically the diagnosis is usually straightforward in hysterectomy specimens. Hysterectomy is the treatment with or without chemotherapy. Progress after surgery should be monitored by placental lactogenic hormone.
Subject(s)
Adult , Diagnosis, Differential , Female , Humans , Hysterectomy , Pregnancy , Trophoblastic Tumor, Placental Site/diagnosis , Uterine Neoplasms/diagnosisSubject(s)
Humans , Female , Pregnancy , Pregnancy Complications, Neoplastic/diagnosis , Hydatidiform Mole, Invasive , Trophoblastic Tumor, Placental Site/classification , Trophoblastic Tumor, Placental Site/diagnosis , Trophoblastic Tumor, Placental Site/blood supply , Diagnosis, Differential , Methotrexate , Risk FactorsABSTRACT
Entre enero de 1979 y diciembre de 1991 se estudiaron 63 mujeres con enfermedad trofoblástica del embarazo. Seis de ellas fueron molas parciales que evolucionaron desfavorablemente: tres como abortos consumados y tres que desarrollaron hipertensión arterial con síndrome nefrótico (una de ellas con tensión arterial de 210/130 mm.Hg. y convulsiones). Del total de molas parciales la mitad fueron estudiadas genéticamente. Dos tuvieron cariotipo diploide y una triploide. Las que cursaron con hCG más elevada fueron tratadas con metotrexito. Ninguna de ellas se embarazaron durante los cinco años subsiguientes.