Pigmented Villonodular Synovitis: A Metastatic Melanoma Imitator.

A 45-year-old woman with a history of previously treated left plantar foot melanoma presented with a left thigh mass. Fine needle aspiration findings were concerning for metastatic melanoma (MM). Imaging was remarkable for PET-avidity of both the biopsied thigh mass and of a left posterior knee nodule.

Musculoskeletal neoplasia: helping the orthopaedic surgeon establish the diagnosis.

Encountering musculoskeletal neoplasia in the clinical practice of orthopaedic surgery is a rather uncommon event but can be an anxiety-provoking experience when it occurs. Using a systematic approach to imaging these lesions includes evaluation via plain radiographs and other modalities such as bone scintigraphy (BS), computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography (PET). By applying specific imaging characteristics obtained from these different modalities, the radiologist and orthopaedic surgeon can jointly create an appropriate differential diagnosis.

Favorable long-term results of prosthetic arthroplasty of the knee for distal femur neoplasms.

Unlabelled: We evaluated implant survival, late complications prompting reoperation and functional outcome in long-term (> 5 years) survivors of bone neoplasms of the distal femur treated with osteoarticular resection and segmental rotating hinge total knee arthroplasty. We retrospectively reviewed 83 patients who survived more than 5 years after the first procedure. Seventy-four of the 83 patients have retained a mobile knee joint.