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Related Experiment Videos

Characterizing "blue blobs". Immunohistochemical staining and ultrastructural study.

M Abdulla1, S Hombal, A Kanbour

  • 1Department of Pathology, Faculty of Medicine, Kuwait University, Safat, Kuwait.

Acta Cytologica
|August 10, 2000
PubMed
Summary

Blue blobs (Bbs) in atrophic Pap smears are degenerated squamous cells, not a sign of disease. These findings in postmenopausal women are generally not clinically significant but can cause diagnostic errors.

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Area of Science:

  • Cytopathology
  • Gynecologic Pathology

Background:

  • Atrophic Pap smears in postmenopausal women can present with unusual findings.
  • Blue blobs (Bbs) are a poorly understood cytological feature.

Purpose of the Study:

  • To determine the nature and origin of blue blobs (Bbs) in postmenopausal women's atrophic Pap smears.
  • To assess the clinical significance of Bbs.

Main Methods:

  • Retrospective analysis of 412 atrophic Pap smears.
  • Detailed cytochemical analysis of Bbs using special stains (PAS, MMP), immunohistochemistry (cytokeratin, EMA, CEA, vimentin, MSA), and electron microscopy.

Main Results:

  • Bbs exhibited heterogeneous morphology, positive for PAS and MMP, negative for mucicarmine and calcium.

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  • Immunohistochemistry showed Bbs positive for cytokeratin, EMA, and CEA, negative for vimentin and MSA.
  • Electron microscopy revealed degenerated cellular skeletons with residual tonofilaments and nuclei.

    • Conclusions:

    • Bbs represent degenerated parabasal/intermediate squamous cells.
    • Bbs are generally of no clinical significance in postmenopausal women.
    • Bbs may pose a diagnostic challenge, leading to potential errors.