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Classifying Matter by Composition03:35

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Matter: Pure Substances and Mixtures
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Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.
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Composite areas are structures with multiple basic shapes connected in some way. These shapes usually include rectangles, triangles, circles, and other basic shapes that are connected in such a way as to form a single structure. Calculating the second moment of area for a composite area is essential when trying to understand the structure's overall stiffness.
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A Reliable Porcine Fascio-Cutaneous Flap Model for Vascularized Composite Allografts Bioengineering Studies
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Primary Cutaneous Composite Lymphomas.

Stephanie Chen, Daniel Boyer, Alexandra C Hristov1

  • 1From the Department of Pathology, University of Iowa Health Care, Iowa City (Dr Chen); and the Departments of Pathology (Drs Boyer and Hristov) and Dermatology (Dr Hristov), University of Michigan Medical Center, Ann Arbor.

Archives of Pathology & Laboratory Medicine
|November 9, 2018
PubMed
Summary
This summary is machine-generated.

Composite lymphomas of the skin are rare, often combining B-cell and T-cell lymphomas. Diagnosis requires extensive evidence to differentiate from similar skin conditions.

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Area of Science:

  • Dermatology
  • Hematology
  • Oncology

Background:

  • Composite lymphomas involve two distinct lymphoma subtypes at one site.
  • Cutaneous composite lymphomas are rare and diagnostically challenging.
  • Commonly present as combined B-cell and T-cell lymphomas, often mycosis fungoides with a low-grade B-cell lymphoma.

Purpose of the Study:

  • To highlight the diagnostic challenges of composite lymphomas in the skin.
  • To emphasize the importance of comprehensive evaluation for accurate diagnosis.

Main Methods:

  • Review of existing literature and case reports on cutaneous composite lymphomas.
  • Discussion of differential diagnoses, including pseudolymphomas and primary cutaneous lymphomas.
  • Emphasis on the need for integrated diagnostic criteria.

Main Results:

  • Cutaneous lymphoid infiltrates can comprise mixed B and T cells, mimicking composite lymphomas.
  • Distinguishing composite lymphomas from reactive proliferations and other primary cutaneous lymphomas is difficult.
  • Diagnostic criteria include abnormal architecture, cytology, immunophenotype, and molecular clonality.

Conclusions:

  • Accurate diagnosis of composite skin lymphomas requires robust evidence.
  • Integrated assessment of histological, cytological, immunophenotypic, and molecular data is crucial.
  • Exclusion of pseudolymphomas and other primary cutaneous lymphomas is essential for correct diagnosis.