Atypical inguinal malignant peripheral nerve sheath tumour with arteriovenous fistula of the left femoral nerve in a child.

We report a 9-year-old girl who developed a malignant peripheral nerve sheath tumour (MPNST) with an arteriovenous fistula arising from the left femoral nerve and adjacent to the iliofemoral vessels in the ipsilateral groin, but without infiltrating them. We describe the MRI and MRA findings. Although MPNST is relatively well known and widely studied, the location of this mass is unique in a child. The mass was surgically removed.

Imaging patellar complications after knee arthroplasty.

The purpose of this study is to describe complications affecting the patella in patients with total or partial knee arthroplasty. We respectively analysed plain-film radiographs, as well as ultrasound images when acquired, in a consecutive series of 1272 patients. The mean interval from knee replacement to patellar complications was 5 years and 7 months (range, 5 months to 14 years). The complications described include fracture, instability, dislocation or luxation, necrosis of the patella, infection of the patella, erosion of the patella, patellar impingement on the prosthesis and patellar or quadricipital tendon tear. We discuss the pathological imaging findings in the patella and their differential diagnosis after knee arthroplasty. Patellar complications after knee arthroplasty are uncommon but often potentially serious.

The use of MRI scanning for investigating soft-tissue abnormalities in the elbow.

It is well known that the elbow is one of the most difficult joints to be examined in MR, because of its position in relation to the body during the examination. Moreover, there is relatively little information about the elbow, even less in its soft tissues abnormalities, in the literature in comparison to other joints. This article describes the spectrum of MR findings soft tissues abnormalities of the elbow, giving an analysis of injuries to the elbow ranging from inflammation to rupture to masses, and the role of MR in post-surgical follow-up. It is demonstrated that MR provides an excellent alternative to other imaging techniques that would be of interest to orthopedic surgeons. The value of MRI to accurately determine the nature and extent of the pathologic changes in ligaments, tendons and muscles structures of the elbow joint is presented in the following discussion.

An unusual case of tophaceous gout involving the anterior cruciate ligament.

Abstract We describe a very unusual case of a 49-year-old man with tophaceous gout involving and infiltrating the base of the anterior cruciate ligament of the left knee. To our knowledge, such a case has never been reported in the literature, although gout is well known and widely studied. Magnetic resonance imaging findings and differential diagnosis were analyzed before arthroscopy. Tophaceous gout was suspected at arthroscopy and confirmed on pathologic examination. Treatment consisted of partial removal of the tumor by arthroscopy, conserving the anterior cruciate ligament.

Mucoid degeneration of the anterior cruciate ligament with erosion of the lateral femoral condyle.

We report a case of a mucoid degeneration of the anterior cruciate ligament (ACL) that produced osseous erosion of the medial aspect of the lateral femoral condyle. The MRI findings and differential diagnosis are discussed.