blastoid


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blastoid

(ˈblɑːstɔɪd) palaeontol
n
a type of extinct echinoderm, which can be found in fossil form in regions of North America
adj
of or relating to blastoids
References in periodicals archive ?
5,12) It is characterized by large expansile follicles that efface lymph node architecture, have attenuated mantle zones, and are composed of intermediate-sized blastoid centroblasts that express CD10 and BCL6 with a high proliferation index.
showed that the typical blasts were seen in 44% of skin biopsy specimens of BPDCN, with the majority (56%) of cases presenting as a rather pleomorphic infiltrate with admixed blastoid cells in the background.
Out of 18 cases, 14 were B-cell lymphomas (CD20+) including 12 cases of diffuse large B cell lymphoma, one low grade lymphoma (CD5+, CD23+) and one Blastoid mantle cell lymphoma (CD5+, CD23-).
Based on the findings, the diagnosis of blastoid variant of mantle cell lymphoma (MCL) was established.
Only two blastoid species and six crinoid species have been described from the Columbus Limestone of central Ohio (Table 1), and no identified echinoderms have been described previously from the Delaware Limestone.
Many of the blastoid and crinoid stems are extremely thin and may not have been able to withstand high-energy currents.
When Baumiller looked at more than 4,000 fossils of the blastoid Heteroschisma, he found that 139 had conical or cylindrical holes.
23,24) Although CD10 is expressed in rare cases of HSTL, all cases should be negative for CD34, including those with blastoid morphology.
Although leukemic phase of blastoid MCL can be a difficult differential diagnosis of B-PLL, in the index case, the monomorphic population of atypical lymphocytes with characteristic morphology and immunophenotyping characteristics tilted our diagnosis in favor of B-PLL short of cyclin D1 staining and cytogenetics.
After extensive phylogenetic study involving careful character analysis, he found that the Permian survivors among blastoid echinoderms were drawn from many branches of the evolutionary tree.