Superficial acral fibromyxoma

Area of Science:

• Dermatopathology
• Orthopedic Oncology
• Radiology

Background:

• Superficial acral fibromyxoma (SAFM) is a rare mesenchymal neoplasm.
• SAFM typically occurs in the periungual and subungual regions of digits.
• Diagnosis often relies on surgical pathology.

Observation:

• A 47-year-old woman presented with a slow-growing mass on her distal right thumb.
• Radiographic imaging revealed extrinsic pressure erosion of the underlying cortical bone.
• The mass was surgically excised and analyzed.

Findings:

• Surgical pathology confirmed the diagnosis of superficial acral fibromyxoma (SAFM).
• The tumor demonstrated pressure erosion on the adjacent thumb cortex.
• This case highlights a less common presentation of SAFM.

Implications:

• Accurate diagnosis of SAFM is crucial for appropriate management.
• Radiographic findings can suggest the presence of bone erosion by soft tissue tumors.
• Understanding SAFM's presentation aids in differentiating it from other digital masses.