[A new technique for foetal brain fixation and extraction]

We performed a new technique for foetal brain fixation and extraction that offers a remarkable reduction in sampling time facilitates specimen handling while conserving high quality. With the new fixation method, it is possible to obtain samples adequate for macroscopic and microscopic observations and immunohistochemical analysis. The technique involves the creation of an ex vacuo phenomenon in the subarachnoideal space prior to injecting the fixative solution. In this manner, the solution is homogenously distributed. Ease, reproducibility and the possibility of standardizing the procedure are the principal advantages. Low costs, reduced wording time and less need for human resources are other advantages. Histologically, we obtained, quickly, high quality slides with routine and immunohistochemical stains. Disadvantages of the technique derive from the use of formaldehyde and glacial acetic acid, rather than water to wash the samples; thus one must work in a well ventilated area, with gloves, protective glasses and an adequate lab coat to avoid skin and respiratory tract damage.