[Fetal ovarian cyst: prenatal diagnosis, perinatal outcome and treatment. Case series and literature review]. / Quiste de ovario fetal: diagnóstico prenatal, evolución perinatal y tratamiento. Serie de casos y revisión de la bibliografía.

BACKGROUND: Ovarian cysts in fetal abdominal tumors are more frequently diagnosed during pregnancy. Most of the time are usually small, asymptomatic and resolve spontaneously during pregnancy or in early neonatal life. OBJECTIVE: To describe the clinical and ultrasound cases with prenatal diagnosis of ovarian cyst treated in our center between 2002 and 2005. MATERIAL AND METHODS: Descriptive and observational cases of fetal ovarian cyst diagnosedbefore birth. The variables maternal and perinatal most relevant clinical data obtained at diagnosis and after birth. RESULTS: We explored 9.198 fetuses, of which there were 10 cases of ovarian cyst diagnosed between the second and third trimesters of pregnancy. All cases were unilateral andsonographic appearance homogeneous. In four cases there was spontaneous disappearance during the remaining gestational period. In the other six cases, four missing in the first 12 months and only two image persisted more than a year. CONCLUSIONS: Based on our results and in accordance with the literature, the prenatal diagnosis of fetal ovarian cyst is usually associated with a conservative approach with serialultrasound monitoring to rule out rare serious complications. During the neonatal period spontaneous disappearance is often the case and the surgical approach is indicated in cases with suspected persistent or torsion or hemorrhage, with cystectomy as first choice.

Detection of a mariner-like element and a miniature inverted-repeat transposable element (MITE) associated with the heterochromatin from ants of the genus Messor and their possible involvement for satellite DNA evolution.

The satellite DNA of ants Messor bouvieri, M. barbarus and M. structor, studied in a previous paper, is organized as tandemly repeated 79-bp monomers in the three species showing high sequence similarity. In the present paper, a mariner-like element (Mboumar) and a new MITE (miniature inverted-repeat transposable element) called IRE-130, inserted into satellite DNA from M. bouvieri, are analyzed. The study of Mboumar element, of its transcription and the putative transposase that it would encode, suggests that it could be an active element. Mboumar elements inserted into IRE-130 elements have also been detected. It is the first time, to our knowledge, that a MITE has been described in Hymenoptera and it is also the first time that a mariner-like element inserted into a MITE has been detected. A mariner-like element, inserted into satellite DNA from M. structor and in M. barbarus, also has been found. The results seem to indicate that transposition events have participated in the satellite DNA mobilization and evolution.