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Proliferating thymolipoma: ultrastructural, immunohistochemical, and flowcytometric study
M T Hull1, K A Warfel, P Kotylo
1Department of Pathology, Indiana University School of Medicine, Indianapolis, USA.
Ultrastructural Pathology
|January 1, 1995
Summary
This study details a rare mediastinal tumor composed of abnormal thymic tissue. The findings provide a unique histological and ultrastructural characterization of this specific tumor type.
Area of Science:
- Pathology
- Surgical Oncology
- Histology
Background:
- Mediastinal tumors represent a diverse group of neoplasms, with thymic epithelial tumors being a significant subset.
- Accurate classification of thymic neoplasms is crucial for prognosis and treatment strategies.
- This case presents a unique histological entity within the spectrum of thymic tumors.
Observation:
- A 207-g superior-anterior mediastinal mass was surgically excised from a 50-year-old male patient.
- The tumor exhibited a multilobulated, encapsulated architecture with interspersed adipose and abnormal thymic tissues.
- Histological examination revealed cords and nests of epithelial cells within adipose or myxoid stroma, alongside areas resembling cortical thymic tissue.
Findings:
- Immunohistochemical analysis showed epithelial cell positivity for cytokeratin and negativity for vimentin, S-100, chromogranin, and parathyroid hormone.
- Flow cytometry indicated a late cortical thymic lymphocyte phenotype, and the tumor was diploid.
- Electron microscopy confirmed epithelial cells with desmosomes, tonofilaments, and characteristic organelles, surrounded by basal lamina.
Implications:
- This report provides the first detailed histological and ultrastructural study of this specific mediastinal tumor type.
- The findings contribute to the understanding of thymic epithelial tumor heterogeneity.
- Further research may elucidate the specific lineage and behavior of this rare neoplasm.