Figure 4
Keywords: Synovial metaplasia, Histopathology-image, Pathology
Sections show a irregularly shaped cystic space without an epithelial lining (ie a pseudocyst) surrounded by a dense fibrosis (figure 1). The pseudocyst is lined by a characteristic membrane similar to hyperplastic synovium: the cells of the membrane showed an eosinophilic spindle shaped cytoplasm with processes towards the lumen, which is identical to synovium (figure 2, right hand side; figure 3). It is not uncommon to find foreign material (figure 2, left hand side; figure 4) surrounded by a foreign body reaction and/or synovial metaplasia.
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