TUMOURS AND CYSTS
New growths taking origin in the synovial membrane are rare, and are not
usually diagnosed before operation. They are attended with exudation
into the joint, and in the case of _sarcoma_ the fluid is usually
blood-stained. If the tumour projects in a polypoidal manner into the
joint, it may cause symptoms of loose body. One or two cases have been
recorded in which a _cartilaginous tumour_ growing from the synovial
membrane has erupted through the joint capsule and infiltrated the
adjoining muscles. _Multiple cartilaginous tumours_ forming loose bodies
are described on p. 544.
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