Chyliform collections are found principally in serous membranes. They occur from rupture of a vessel or even of the thoracic duct. In most cases, however, they are due to a primary purulent collection whose microbes have succumbed to the supply of unorganized ferments furnished by a healthy organism (enzymes) sufficiently to cause a granulo-fatty degeneration. The fat is freed and emulsified, giving the liquid a milky appearance.

If the liquid is absorbed, a cheesy mass remains, which may take on calcareus transformation. Tubercles sometimes take on this change or cure.

Symptoms of a purulent focus are pain, heat, redness, swelling. Pain is the first symptom. It is caused by an increased flow of blood to the part, which causes swelling and heat, as well as the redness.

The pain is of a pulsating character. In time the pulsating pain gives way to a feeling of constriction, due to stretching of the nerves. After pus forms, the pain may subside, to appear only upon pressure. Cold abscesses are considered tubercular. They form without causing much reaction. I have seen reputable physicians confuse sarcoma and cold abscesses.