From Wikipedia, the free encyclopedia. For the fungi genus, see Chalazion (fungus) . A chalazion (/kÉËleÉªziÉn/ ; plural chalazia /kÉËleÉªziÉ/), also known as a meibomian gland lipogranuloma, is a cyst in the eyelid that is caused by inflammation of a blocked meibomian gland, usually on the upper eyelid.Chalazia differ from styes (hordeola) in that they are subacute and usually painless nodules.rom Wikipedia, the free encyclopedia. For the fungi genus, see Chalazion (fungus) . A chalazion (/kÉËleÉªziÉn/ ; plural chalazia /kÉËleÉªziÉ/), also known as a meibomian gland lipogranuloma, is a cyst in the eyelid that is caused by inflammation of a blocked meibomian gland, usually on the upper eyelid.
The nucleus, chloroplast, and mitochondria have in common is that they are membrane-bound organelles in a cell.
Cell wall and chloroplasts. These are only found in plant cells. Chloroplasts will be discussed in photosynthesis-but, like the mitochondria-they have an envelope of two membranes making up the outer wall. They have pairs of membranes called thylakoids arranged in stacks, each stack being called a granum.ell wall and chloroplasts. These are only found in plant cells. Chloroplasts will be discussed in photosynthesis-but, like the mitochondria-they have an envelope of two membranes making up the outer wall. They have pairs of membranes called thylakoids arranged in stacks, each stack being called a granum.