Diagnostic cytology is an amazing science that allows us to interpret cells from the human body, such as those found in fluids or through fine needle aspirates.This residual material can be evaluated quickly and easily by forming a cell block, embedding it in paraffin, and examining it in addition to the routine cell smears (CS). It has been observed in numerous studies that the cytologic examination of fluids and fine needle aspirates by means of smears leaves behind a significant residue that is not further investigated and that may contain valuable diagnostic material. In addition to traditional cytomor phology, immunocyto chemistry is being utilized to diagnose fine needle aspirates.