La Radiologia medica
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La Radiologia medica · Apr 2004
Pigmented villonodular synovitis (PVNS) of the knee joint: magnetic resonance imaging (MRI) using standard and dynamic paramagnetic contrast media. Report of 52 cases surgically and histologically controlled.
Pigmented villonodular synovitis (PVNS) is a rare proliferative disorder of the synovial membrane, exhibiting benign behaviour from a biological point of view. This kind of synovial hyperplasia leads to the formation of villi and nodules characterized by deposit of intracellular haemosiderin. It primarily involves young adults, the peak age being between the second and fourth decade of life. It may appear either in a diffuse or a localized (nodular) form. The joint most affected is the knee and diffuse PVNS is the most common form. Diagnostic imaging techniques, particularly MRI, allow lesion identification, suggesting a diagnosis. However, such diagnosis can be confirmed only on histology as the final diagnosis of PVNS, and therefore the possibility of differential diagnosis with other haemorrhagic and chronic hyperplastic synovites, is based on the detection of intracellular haemosiderin components. The aim of this study is to evaluate the usefulness of MRI, which might be completed with the intravenous injection of contrast medium, in the characterization of such pathological picture. ⋯ PVNS of the knee presents a difficult differential diagnosis. In many cases, only MRI is able to identify the presence of haemosiderin precipitates within the nodules characterizing the lesion. The use of standard and dynamic contrast media seems unable to provide additional diagnostic information. Thus, the diagnosis still pertains to histology.
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La Radiologia medica · Apr 2004
Comparative Study Clinical TrialAcute traumatic acromioclavicular joint lesions: role of ultrasound versus conventional radiography.
To assess the diagnostic potential of ultrasound as compared to conventional radiography in quantifying the anatomic and structural damage and determining the grade of acute traumatic lesions of the acromioclavicular (AC) joint. ⋯ If appropriate methodology and adequate transducers are used, ultrasound is an accurate and reliable technique for the evaluation of acute AC joint injuries, complementing and correlating well with conventional radiography.