... This was formerly believed to be an endothelioma derived from a proliferation of the endothelial cells lining the lymph spaces and blood vessels of the gland. A more probable view is that it develops from rests derived from the first branchial arch an not from the parotid. The matrix of the tumour is made up of cartilaginous, myxomatous, sarcomatous, or angiomatous tissue, the proportion of these different elements varying in individual ... — Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. • Alexander Miles
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