Intraarticular epithelioid sarcoma

Area of Science:

• Orthopedic Oncology
• Radiology
• Pathology

Background:

• Epithelioid sarcoma typically affects subcutaneous tissues, commonly in the extremities.
• Intraarticular presentation of epithelioid sarcoma is rare.

Observation:

• A 35-year-old male presented with a 10-month history of chronic monoarthritis.
• Magnetic resonance imaging (MRI) demonstrated a diffuse lesion involving the knee's synovial membrane.
• T2-weighted MRI sequences showed a marked signal increase within the lesion.

Findings:

• The case highlights an intraarticular epithelioid sarcoma, an uncommon manifestation of this tumor type.
• The lesion's characteristics on MRI, particularly the T2 signal hyperintensity, are noted.

Implications:

• This unusual presentation necessitates considering epithelioid sarcoma in the differential diagnosis of intraarticular proliferative lesions.
• Radiologists and orthopedic surgeons should be aware of this rare intraarticular tumor possibility.
• Further investigation into the diagnostic and therapeutic strategies for intraarticular epithelioid sarcoma may be warranted.