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[Technic for the preparation of bone marrow biopsies. Evaluation of bone marrow cell count].

After having briefly reviewed the different subjective and objective procedures for interpreting Bone Marrow Biopsies from the standpoint of evaluating Bone Marrow Cellularity, the authors propose a method for overall morphological examination, controlled by a rapid evaluation by means of an integrator ocular. This simple, reliable and easily reproducible "semi-subjective" technique seems useful in routine pathological diagnosis, particularly to compare successive Bone Marrow Biopsies from the same patient when treated by antimitotics, or to study the changes of the hematopoietic tissue in the area of medullary metastasis.