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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric surgery international 12 (1996), S. 66-68 
    ISSN: 1437-9813
    Keywords: Extraspinal ; Retroperitoneal ectopic neural tissue ; Retroperitoneal tumor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a 3-year-old boy an abdominal mass was palpated by chance, which consisted of cystic and solid structures and was shown on ultrasound scan and computed tomography to be located retroperitoneally. Intraoperatively, the cystic tumor contained clear, yellowish fluid and had a stalk leading to the interspinal space between L2 and L3. However, no signs of dysraphism, were found. Neuropathologic examination surprisingly showed non-neoplastic ectopic neural tissue, which has never been recorded at this extraspinal site before.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0568
    Keywords: Meiosis ; Fetus ; Gonads
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The ultrastructure of female and male germ cells and associated somatic cells were studied in morphologically sex differentiated fetal pig gonads from day 27 to day 95 post insemination. Before meiosis starts in the ovary, the organelles of germ cells and somatic cells of both sexes are poorly developed. In oocytes in leptotene stage, the endoplasmic reticulum attains close proximity to the plasma membrane forming characteristic contact areas which in addition are only seen in male germ cells of the same age. As meiosis progresses, the organelles of the oocyte increase in number and degree of differentiation. In particular the ER is prominent in the diplotene stage. At midgestation the male germ cells become polarized, the organelles gathering at one side of the nucleus. In the granulosa cells the number and extension of organelles increase concomitantly with the oocytes proceeding through meiosis. The Sertoli cells grow progressively complex in shape, with numerous mitochondria and a prominent ER, whereas the Golgi complex remains poorly developed. Small dense bodies are present both in germ cells and somatic cells. They are electron dense, membrane bounded, rounded or elongated granules often connected with endoplasmic reticulum. No activity of peroxidase, catalase or acid phosphatase could be traced in the granules, making them improbable candidates as peroxisomes or lysosomes. Their number is high in all germ cells and somatic cells on day 27 post insemination and in germ cells in leptotene stage.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pediatric cardiology 15 (1994), S. 159-162 
    ISSN: 1432-1971
    Keywords: Cerebral ultrasonography ; Cardiac surgery ; Infants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cerebral ultrasonography was performed in 66 infants before and after open heart surgery in order to study the incidence of cerebral complications. The underlying cardiac malformations were ventricular septal defect (n=28), transposition of the great arteries (n=11), tetralogy of Fallot (n=8), complete atrioventricular septal defect (n=5), total anomalous pulmonary venous drainage (n=3), truncus arteriosus communis (n=2), and complex cardiac malformations (n=9). In 60 of the 66 infants ultrasonography of the brain preoperatively was normal, 3 had minor structural abnormalities, and 3 had ventriculomegaly of various degrees. Postoperatively, 46 infants had a normal brain ultrasound scan; 6 had slight structural abnormalities; and 5 had slight symmetric or asymmetric widening of the ventricles. Five infants showed severe ventriculomegaly with cerebral atrophy, and in 4 patients there was intracerebral hemorrhage, associated in 2 cases with severe ventriculomegaly. On repeat examinations it was found that up to 4 weeks after the operation an initially normal cerebral ultrasound scan could convert to a pathologic one. Most of those children who showed significant deterioration on the cerebral ultrasound scan suffered from complex cardiac malformations or had severe problems during the postoperative period.
    Type of Medium: Electronic Resource
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