Page:Handbook of Ophthalmology (3rd edition).djvu/223

Rh in consequence of dacryocystitis. Sometimes when this occurs the fossa lacrymalis may be seen externally.

Polypi of the lachrymal sac occur simultaneously with the blennorrhœa of its mucous membrane. Their presence may, in many cases, be recognized by the fact that after pressing out the blennorrhœal secretion through the puncta, the sac is not emptied, but still offers an elastic resistance. There is no difficulty in extirpating these polypi after opening the sac. But such growths sometimes occur also in the lower part of the nasal duct. I have at least once during an anatomical examination found a pediculated villous growth of the mucous membrane in the lower third of the duct. In such cases both the diagnosis and the treatment would be very difficult.