PubMed HealthSearch

PubMed · 139473

[Parasitic calcifications: elements for diagnostic (author's transl)].

Abstract

Among the radiologic calcifications, those of parasitic etiology are rather commonly found. They are heterotopic dystrophic calcifications, their late apparition in the evolution of the parasitic disease is not subordinate to any metabolic dysfunction. The authors describe the morphologic and the topographic criteria of different parasitic calcifications except the fungic ones and protozoaire. Moreover they state for each parasite some epidemiological, biological and clinical facts which can be helpful for the diagnosis.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

P Dellamonica, Y le Fichoux, A Coussement, J J Serres. 1977. [Parasitic calcifications: elements for diagnostic (author's transl)].. https://pubmed.ncbi.nlm.nih.gov/139473/

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Fatty acids in female Macracanthorhynchus hirudinaceus (Acanthocephala).

Neutral lipids and phospholipids in the body wall, lemnisci and pseudocoel and neutral lipids of fluid found in the "tube" system of the lemnisci and the lacunar system of the body wall of Macracanthorhynchus hirudinaceus (Acanthocephala) were determined by the technique of thin layer chromatography and gas chromatography (GC). Sixteen different fatty acids from nonpolar lipids were identified as follows: 8:0, 10:0, 11:0, 12:0, 13:0, 14:0, 14:1, 16:0, 18:0, 18:1, 18:2 and/or 20:0, 18:3 and/or 20:1, 20:3, 22:1, 24:1 and 22:6. In addition, there were three unidentified GC peaks corresponding to chain lengths greater than 20 carbons. Sixteen different fatty acids from phospholipids were identified in each of the three fractions analyzed. They were as follows: 10:0, 11:0, 12:0, 13:0, 14:0, 14:1, 16:0, 16:1, 18:0, 18:1, 18:2 and/or 20:0, 20:2, 20:3, 22:1, 24:1 and 22:6. Four unidentified peaks were also observed. There was a significant difference in the percentage of lipid as well as the concentration of particular fatty acids when each fraction was compared. There was also an abundant supply of sterols and glycerides in each fraction.

Acanthocephala

Evasion of the insect immune response by Moniliformis dubius (Acanthocephala): further observations on the origin of the envelope.

The envelope around larvae of Moniliformis dubius appears to protect the parasite against immune recognition and encapsulation by the insect host's haemocytes. The origin of this envelope has been the subject of controversy although most evidence suggests it is parasite-derived. If host-derived, the envelope would be expected to share surface properties with host tissue. Thus, experiments were undertaken, transplanting parasites and host tissue to other insects and using haemocytic encapsulation as an assay for immune recognition, in order to compare the response to host tissue and to the parasite's envelope. Parasites without their envelopes, and pieces of tissue (ventral nerve cord) from the experimental host (the locust Schistocerca gregaria) were recognized as foreign and encapsulated in the cockroach, Periplaneta americana. The majority of parasites with their envelopes were unencapsulated or only partially encapsulated on transfer to their normal host, P. americana, indicating that the envelope does not have surface similarity to locust tissue. Cockroach-derived parasites with or without envelopes were not encapsulated in S. gregaria, suggesting that the larva itself can evade or inhibit the locust's recognition mechanism. However, since larvae which develop in S. gregaria are enclosed in an envelope, the formation of the envelope would seem to be an inherent feature of the parasite's development.

Acanthocephala