Chalazion
Chalazia are firm, swollen masses that are well localized in the
eyelid. They are caused by an impaction of the meibomian glands
along the eyelid margin. The gland becomes distended with secretion,
and in many cases the gland ruptures releasing the secretion to
the surrounding eyelid tissue. This may result in a localized
tissue reaction called a granuloma. Chalazion often occur adjacent
to an eyelid tumour when the tumour is blocking the normal drainage
of the meibomian gland. In some cases chalazia are lanced and
curetted, while in others they are removed surgically and sent
for pathology to rule-out the possibility of tumour.