ENDOMETRIAL CELLS: Endometrial cells  are a normal finding in smear taken during mensturation or in the first ten days of the menstrual cycle. Their presence at other times may have a pathological significance. They can be distinguished from endocervical cells by their small size(5-20u), cuboidal shape and rounded nuclei which often have a coarse chromatin structure and may vary slightly in size. They are often found in conjunction with histiocytes.  They may present as single cells, or as rounded berry like structures or as irregular fragments.