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Inflammatory aneurysm of the abdominal aorta: role of ultrasonography (1993)

Cilotti, A. ; Bagnolesi, P. ; Lencioni, R. ; [et al.]

Springer

European radiology 3 (1993), S. 333-336

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ISSN: 1432-1084

Keywords: Aneurysm ; Aorta ; Inflammatory aneurysm ; Ultrasound

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract During a 5-year period 229 aneurysms of the abdominal aorta were identified by ultrasonography (US) and subsequently submitted to CT. Of these, 41 were seen to be of the inflammatory type on the grounds of the CT scans, confirmed in 29 cases by surgical findings. The patients were 38 men and 3 women, mean age 64.9 years. US, performed using both 3.5 and 5 MHz probes, revealed the inflammatory nature of the aneurysm in 33 of 41 cases (80.5%). In the remaining cases a correct diagnosis could not be determined because of obesity and/or the distal location of the lesion. Regarding the complications associated with the inflammatory nature of the aneurysm (considered only in those cases submitted to surgery) US revealed a good diagnostic accuracy for ureteral involvement (7/7 cases detected, no false positives). Caval involvement was also correctly identified in 6 of 8 cases, although overestimated in 3 of 21. Both of these complications were correctly detected by CT in all cases. Neither US nor CT furnished reliable signs regarding duodenal and colonic involvement (surgically proven in 4 of 29 cases). US proved effective in detecting the inflammatory nature of the aneurysm. If surgery is considered, CT seems mandatory for a correct assessment of the complications.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00167463

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Fine structure of the spermatozoa of Chiton marginatus (mollusca: Amphineura), with special reference to nucleus maturation (1983)

Russell-Pinto, F. ; Azevedo, C. ; Barandela, T.

New York, NY : Wiley-Blackwell

Gamete Research 8 (1983), S. 345-355

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ISSN: 0148-7280

Keywords: Amphineura ; ultrastructure ; spermatozoon ; nucleus ; Life and Medical Sciences ; Cell & Developmental Biology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology

Notes: The spermatozoon of Chiton marginatus is a long uniflagellate cell displaying structural features of “modified sperm.” The nucleus presents a conical shape with a long apical cylindrical extension. The chromatin is homogeneously dense. Scattered inside the condensed nucleus, a few nuclear lacunae are visible. The acrosomal complex is lacking. Some mitochondria are located in a laterofrontal structure side by side with the nucleus. The typical midpiece is absent. The cytoplasm forms a thin layer around the nucleus and the mitochondria. The proximal centriole is in a basal nuclear indent. The distal centriole serves to form the axoneme tail with the usual microtubular pattern.During nuclear maturation, the early spermatid nucleus is spherical and contains fine granular chromatin patches. The nuclear envelope shows a deposit of dense material at the base of the nucleus, forming a semicircular invagination occupied by a flocculent mass. In middle spermatid stage, the chromatin gets organized in filaments, coiled as a hank, attached over the inner surface of the basal thickening of the nuclear envelope. The nucleus starts to elongate anteroposteriorly. At the pointed apical portion of the spermatid, a group of microtubules is observed seeming to impose external pressure to the nucleus giving rise to the long apical nuclear point. The mitochondria have a basal position. Late spermatids have an elongated conical nucleus. The chromatin filaments are further condensed, and lacunae appear inside the nucleus. Some mitochondria migrate to a lateral position.

Additional Material: 20 Ill.