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The term "synovial lesion" is applied to an affection which is not synovial, and which has no further connection with either synovial membranes or joints than that it is usually situated over a superficial tendon, such as the extensor tendons of the fingers, where all the examples we have seen were situated. It is a smooth, oval, prominent cyst, springing from the sound skin, and has a narrow, light red border about its base, of which we shall say more hereafter. It is absolutely painless and causes no inconvenience, except for its presence as a tumor. It is, however, a verruca, and has nothing to do with either the joints or tendon sheaths; but in spite of this it may be inadvisable to change its name. In rare diseases it is advantageous to have a name that is recollected almost involuntarily on seeing a case, although it may not accord
MONTGOMERY DW, CULVER GD. THE PATHOLOGIC ANATOMY OF SYNOVIAL LESIONS OF THE SKIN. Arch Derm Syphilol. 1922;5(3):329–331. doi:10.1001/archderm.1922.02350280034004
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