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Ultrastructural study of a perineurioma
1Department of Orthopaedic Surgery, Teikyo University School of Medicine, Ichihara Hospital, Chiba Prefecture, Japan.
Ultrastructural Pathology
|September 1, 1988
Summary
Ultrastructural analysis revealed a soft tissue tumor, initially diagnosed as intramuscular myxoma, was composed of perineurial cells. This finding suggests perineurioma as a distinct peripheral nerve sheath tumor category.
Area of Science:
- Surgical pathology
- Electron microscopy
- Soft tissue tumors
Background:
- Intramuscular myxomas are rare soft tissue tumors, typically diagnosed via light microscopy.
- Perineurial cells are specialized cells forming the sheath around peripheral nerves and have been observed in various nerve lesions.
Observation:
- A case study of a 49-year-old female patient with a left brachialis muscle tumor.
- Light microscopy diagnosed the tumor as intramuscular myxoma.
- Electron microscopy revealed the tumor was predominantly composed of cells resembling normal perineurial cells.
Findings:
- Tumor cells exhibited characteristic perineurial cell features: slender cytoplasmic processes, discontinuous basal laminae, pinocytotic vesicles, and scarce intercellular junctions.
- The presence of these features strongly supports a perineurial origin for the tumor.
- The study proposes 'perineurioma' for tumors primarily composed of perineurial cells, distinct from other nerve sheath tumors.
Implications:
- This case highlights the importance of electron microscopy in differentiating soft tissue tumors with ambiguous light microscopic features.
- Perineurioma may represent a distinct third category of peripheral nerve sheath tumors, separate from schwannomas and neurofibromas.
- Further research is warranted to define the precise classification and clinical behavior of perineuromas.