Pseudotumor in total knee revision arthroplasty resembling heterotopic ossification: A case report.

Introduction: Pseudotumors are well-known complications following total hip arthroplasty (THA), usually attributed to debris-induced inflammation from direct metal-on-metal contact between implants. In total knee arthroplasty (TKA), the traditional use of polyethylene as a bearing surface prevents direct metal articulation. Thus, pseudotumor formation in TKA usually suggests atypical metal interaction between the prosthetic components.

Distal Femoral Replacement as a Salvage Treatment After Desmoplastic Fibroma Resection.

Desmoplastic fibroma is an extremely rare primary bone tumor that can mimic the presentation of other bone lesions. We describe the case of a middle-aged male with a mass on the left distal femur initially diagnosed as fibrous dysplasia that underwent a wide margin excision followed by a distal femoral replacement to restore anatomy and functionality. Histologic examination of the complete surgical specimen was consistent with a desmoplastic fibroma.

Persistent synovial actinomycosis in a native knee joint: A case report.

Introduction And Importance: Actinomycosis is a chronic granulomatous disease associated with the Actinomyces species. This unusual condition, especially in the musculoskeletal system, has been considered a diagnostic challenge due to its initial non-specific symptoms requiring high clinical suspicion and an adequate diagnostic approach for its identification.

Case Presentation: We present the case of a 39-year-old Hispanic female with right knee pain and associated purulent secretions for the past four years, who demonstrated persistent synovial actinomycosis despite arthrotomy with cleansing and debridement plus a long-term antibiotic regime.

Myoepithelial tumor in the popliteal area: A diagnostic dilemma.

Introduction And Importance: Myoepithelial tumors are under-recognized neoplasms that could be difficult to identify due to their rarity and limited comprehension. Their diverse morphology, varied cytologic features and heterogenous immunohistochemical characteristics create a significant diagnostic challenge.

Case Presentation: We report the case of a 72-year-old-male patient who received conservative treatment during one year for a popliteal mass on the right knee that showed synovial hyperplasia (benign findings) at initial open tissue biopsy.

Primary leiomyosarcoma of the great saphenous vein: A case report.

Introduction And Importance: Vascular smooth muscle sarcomas are rare neoplasms that comprise less than 2% of all leiomyosarcomas. These malignancies usually originate in the inferior vena cava, with a limited number of cases affecting the great saphenous vein. Due to the limited reports on these sarcomas, epidemiologic data remains insufficient.