It can be classified according to their configuration , shape , content , and can be described specifically with an anatomical term . “
Rheumatoid arthritis is a chronic inflammatory disease characterized by the development of osseous and cartilaginous damage .
The correct differentiation between a true erosion and other entities — then often called “ pseudoerosions”—is essential to avoid misdiagnosing rheumatoid arthritis and to correctly interpret the progress of the disease .
The aims of this systematic review were as follows : to create a definition and delineation of the term “ pseudoerosion ” , to point out morphological pitfalls in the interpretation of images , and to report on difficulties arising from choosing different imaging modalities .
Detection, scoring and volume assessment of bone erosions by ultrasonography in rheumatoid arthritis: comparison with CT
Objectives To determine the accuracy of ultrasonography ( US ) for bone erosion detection in different areas of rheumatoid arthritis ( RA ) metacarpophalangeal ( MCP ) joints with multislice CT as the reference method . Second , to establish the necessary bone volume loss on CT for US to reliably detect it as an erosion , and finally to compare two semiquantitative US-erosion scoring methods . Methods The 2nd–5th MCP joints of 49 patients with RA were examined by CT and US  , and evaluated for the presence of bone erosion in each MCP joint quadrant . On CT , erosion volume was scored according to the OMERACT-RAMRIS score ( bone volume loss in 10 % increments of original bone volume ) . US erosions were scored 0–3 according to the Szkudlarek and Scoring by UltraSound Structural erosion ( ScUSSe ) systems , respectively . Results Seven hundred and eighty-four MCP joint quadrants were examined . Erosions were detected by CT in 259 quadrants and by US in 142 quadrants . Sensitivity/specificity/accuracy of US was overall 44%/95%/78 % compared with 71%/95%/90 % in areas with good US accessibility ( radial 2nd MCP , ulnar 5th MCP and all dorsal/palmar aspects ) . US detected 95 % of erosions with bone volume loss > 20 % . In US accessible areas , 63 % of erosions with 1–10 % bone volume loss and 94 % of erosions with > 10 % bone loss were detected . The two US scoring systems agreed well on large erosions , whereas the smallest erosions ( Szkudlarek grade 1 , of which 86 % were confirmed by CT ) were not scored by ScUSSe . Conclusion In accessible areas , US was highly accurate for detection and semiquantitative assessment of RA bone erosion . Even the smallest erosions , only detected in one plane , were generally confirmed by CT
It can be classified according to their configuration , shape , content , and can be described specifically with an anatomical term . “
Rheumatoid arthritis is a chronic inflammatory disease characterized by the development of osseous and cartilaginous damage .
The correct differentiation between a true erosion and other entities — then often called “ pseudoerosions”—is essential to avoid misdiagnosing rheumatoid arthritis and to correctly interpret the progress of the disease .
The aims of this systematic review were as follows : to create a definition and delineation of the term “ pseudoerosion ” , to point out morphological pitfalls in the interpretation of images , and to report on difficulties arising from choosing different imaging modalities .