Myxoinflammatory Fibroblastic Tumors: Pathological Characteristics and Genetic Insights

Myxoinflammatory fibroblastic tumours represent a rare subset of soft tissue neoplasms characterised by a mixture of myxoid and inflammatory components, bizarre epithelioid and spindle cells, and a propensity for local recurrence with low metastatic potential. Histologically, these lesions display a prominent myxoid stroma interspersed with hyaline and haemorrhagic areas, accompanied by inflammatory infiltrates including lymphocytes and eosinophils. The morphological spectrum ranges from classic low-grade forms to more cellular and occasionally high-grade variants that pose diagnostic challenges, often mimicking other benign or malignant soft tissue entities. At a molecular level, recurrent chromosomal rearrangements such as a t(1;10)(p22;q24) translocation involving TGFBR3 and OGA, BRAF gene fusions and amplification of VGLL3 have emerged as consistent aberrations, shedding light on potential pathogenetic pathways. Although VGLL3 amplification appears most frequent, the precise mechanisms by which these alterations drive tumour initiation and progression remain under investigation. Clinically, wide surgical excision remains the cornerstone of treatment, with radiotherapy considered in cases of positive margins or unresectable disease. Systemic therapies are largely experimental, with few options for advanced or metastatic cases. Recent insights into the tumour microenvironment and immune landscape have opened avenues for targeted approaches and emphasise the need for long-term surveillance given the high recurrence rates.

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Technical terms

Myxoid stroma: A gelatinous, mucopolysaccharide-rich extracellular matrix characteristic of certain soft tissue tumours.

Translocation: A chromosomal rearrangement in which segments from two different chromosomes become abnormally joined, potentially activating oncogenes.

Amplification: An increase in the copy number of a gene or chromosomal region, often leading to overexpression of oncogenic proteins.

Immunohistochemistry: A laboratory technique that uses antibodies to detect specific antigens in tissue sections, aiding in tumour classification.

Tumour microenvironment: The complex milieu of stromal cells, immune cells and extracellular matrix surrounding neoplastic cells, influencing growth and treatment response.

References

1. Recent Advances in the Diagnosis, Pathogenesis, and Management of Myxoinflammatory Fibroblastic Sarcoma. International Journal of Molecular Sciences (2024).
2. Myxoinflammatory Fibroblastic Sarcoma of the Parotid Gland: First Case Report and Literature Review. Frontiers in Medicine (2022).
3. Myxoinflammatory fibroblastic sarcoma of the liver: Case report and literature review. Medicine (2024).
4. Unexpected Clinical Outcome for Myxoinflammatory Fibroblastic Sarcoma, When Should They Be Considered High Grade?. Journal of Investigative Medicine High Impact Case Reports (2023).
5. Myxoinflammatory Fibroblastic Sarcoma: A Radiographical, Pathological, and Immunohistochemical Report of Rare Malignancy. Case Reports in Orthopedics (2015).