[Last Modified: ]
[Entamoeba histolytica]

A	B	C

A, B, C: Entamoeba polecki cysts.  The cysts (line drawing, A; trichrome stain, B and C) have one nucleus (rarely two, C) with a small, usually eccentric karyosome (which can also be rather pleomorphic).  Their cytoplasm contains small inclusions and an "inclusion mass," which stains only weakly in iodine.  The cysts measure usually 11 to 15 µm (range 9 to 18 µm) and their shape varies from spherical to oval.