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Tumors of serosal tissue origin.

J W Bolen

    Clinics in Laboratory Medicine
    |March 1, 1987
    PubMed
    Summary

    Differentiating primary serosal neoplasms like mesothelioma from metastatic cancers is crucial. Histochemistry, immunocytochemistry, and electron microscopy aid in diagnosis, distinguishing benign from malignant and primary from secondary tumors.

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    Area of Science:

    • Pathology and Oncology
    • Surgical Pathology
    • Cytopathology

    Background:

    • Primary serosal neoplasms exhibit diverse growth patterns and aggressiveness, ranging from benign adenomatoid tumors to fatal diffuse malignant mesotheliomas.
    • Distinguishing epithelial mesothelioma from metastatic adenocarcinoma is diagnostically challenging, requiring a multi-modal approach.
    • Sarcomatoid mesothelioma can be mistaken for chest-wall sarcomas, necessitating careful evaluation.

    Purpose of the Study:

    • To outline diagnostic strategies for primary serosal neoplasms.
    • To differentiate various types of mesothelioma from metastatic carcinomas.
    • To clarify the histological and ultrastructural features aiding in the diagnosis of challenging cases.

    Main Methods:

    • Combination of routine histochemistry, immunocytochemistry, and electron microscopy.
    • Assessment of epithelial mucins and reactivity with antibodies to carcinoembryonic antigen (CEA).
    • Ultrastructural analysis of surface microvilli, desmosomes, and tonofilaments.
    • Immunocytochemical evaluation for cytokeratin expression.

    Main Results:

    • Absence of epithelial mucins and nonreactivity with CEA antibodies favor mesothelioma.
    • Specific ultrastructural features (long, thin microvilli, desmosomes, tonofilaments) support primary serosal neoplasms.
    • Cytokeratin expression in sarcomatoid mesothelioma differentiates it from most soft-tissue sarcomas.
    • Poorly differentiated or transitional mesotheliomas present diagnostic difficulties, necessitating clinical correlation.

    Conclusions:

    • A combination of histochemical, immunocytochemical, and ultrastructural findings is essential for accurate diagnosis of serosal neoplasms.
    • Careful review of clinical information and search for a primary tumor site are critical in ambiguous cases.
    • Morphological and immunocytochemical similarities exist between neoplastic mesothelial cells and reactive subserosal cells.

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