Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


#Fibrinous Loose Bodies# (Corpora oryzoidea).--These are homogeneous or
concentrically laminated masses of fibrin, sometimes resembling rice
grains, melon seeds, or adhesive wafers, sometimes quite irregular in
shape. Usually they are present in large numbers, but sometimes there is
only one, and it may attain considerable dimensions. They are not
peculiar to joints, for they are met with in tendon sheaths and bursae,
and their origin from synovial membrane may be accepted as proved. They
occur in tuberculosis, arthritis deformans, and in Charcot's disease,
and their presence is almost invariably associated with an effusion of
fluid into the joint. While they may result from the coagulation of
fibrin-forming elements in the exudate, their occurrence in tuberculous
hydrops would appear to be the result of coagulation necrosis, or of
fibrinous degeneration of the surface layer of the diseased synovial
membrane. However formed, their shape is the result of mechanical
influences, and especially of the movement of the joint.

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