Malignant glomus tumor: a rare case with an ultrastructural study

Area of Science:

• Oncology
• Pathology
• Soft Tissue Tumors

Background:

• Glomangiosarcoma is an exceptionally rare neoplasm, constituting 1% of glomus tumors and 2% of soft tissue tumors.
• Soft tissue tumors require precise diagnosis and characterization due to their diverse nature and potential for malignancy.

Purpose of the Study:

• To report a unique case of glomangiosarcoma with dedifferentiation into myxoinflammatory fibroblastic sarcoma (MIFS) features.
• To describe the diagnostic challenges and ultrastructural characteristics of this rare tumor presentation.

Main Methods:

• Case presentation of a 49-year-old woman with a slow-growing left foot mass.
• Diagnostic workup included magnetic resonance imaging (MRI), Tru-Cut biopsy, and definitive diagnosis via morphologic, immunohistochemical, and ultrastructural studies.
• Treatment involved wide surgical resection and a comprehensive rehabilitation program.

Main Results:

• MRI revealed a deep, infiltrative, heterogeneous soft tissue mass with necrosis.
• Biopsy and subsequent studies confirmed a conventional glomus tumor with malignant areas and dedifferentiation into MIFS.
• The patient achieved full functional recovery after surgical intervention and rehabilitation.

Conclusions:

• This case represents the first documented instance of glomangiosarcoma dedifferentiating into MIFS.
• Ultrastructural analysis was crucial in identifying this rare disease and its unique differentiation pattern.
• Early diagnosis and aggressive surgical management are vital for favorable outcomes in rare soft tissue malignancies.