Millipore Filter® Cell Block Preparation: An Alternative to Cell Block in Nongynecologic Specimens of Limited Cellularity

The use of membrane filters to concentrate cytology specimens was first described by Seal (Cancer 1956; 9:866–868). We report on a technique in which a portion of Papanicolaou-stained Millipore filter® (Millipore Corp, Bedford, MA) preparation can be converted into a paraffin block for hematoxylin-eosin (HE 2) clean background; 3) preservation of cytology specimens for future studies. Diagn. Cytopathol. 1999;20:389–392. © 1999 Wiley-Liss, Inc.