TUMORS OF THE EYELIDS 507 



base of them with silver nitrate, and follow at once with salt 

 solution to prevent undue caustic action and injury to the 

 eye. Tubercular nodules and warts in parrots should be 

 incised and removed as completely as possible. Conserve 

 as much of the eyelid as possible. In epitheliosis the warts 

 should be removed with the knife or curette and iodin applied. 

 Warts projecting out from the Meibomian glands are opened 

 and curetted with a small instrument. The base of the warts 

 should be carefully cauterized. 



Chalazion. Meibomian Cyst. These are small cystic 

 growths, appearing on the free margin of the lid, or on the 

 skin, standing out prominently. They are sebaceous cysts 

 having no inflammatory reaction and filled, as a rule, with a 

 thick honey-like material. A true chalazion is a retention 

 of the secretions of the Meibomian glands. They are fre- 

 quently observed in dogs, more commonly in mature animals. 

 They form a firm, circumscribed swelling, gradually enlarg- 

 ing until they reach the size of a pea or walnut. A differentia- 

 tion is difficult to make as they resemble sebaceous cysts. 

 Their development often leads to a horny-like excrescence 

 on the surface, and often take on the character of a malignant 

 growth. They may involve the free margin of the lid, or 

 extend to the entire structure of the upper eyelid. 



Treatment. Small sebaceous cysts are opened and the 

 contents squeezed out. The opening is made large enough 

 in order that the gland can be destroyed with iodin or silver 

 nitrate. 



In true chalazion it is advisable to remove a small trian- 

 gular portion of the lid, including the cyst, with the base of 

 the triangle on the margin of the lid. This is best done, under 

 morphin anesthesia, with the scissors. Approximate the 

 wound thus made with fine silk or linen. Union is usually 

 complete in ten days to two weeks. Curetting the enlarge- 

 ment may be tried in cases where the operation is not possible. 



Pilosebaceous Cysts. These are found on the upper eye- 

 lid in dogs, especially bulldogs and pugs with wrinkled skin. 

 The contents of the cysts are hair, sebum, and pus, which 

 is usually discharged through a fistulous opening. 



