[Pituitary adenomas: relationship between invasiveness and proliferative cell nuclear index].

We evaluated clinically, radiologically and surgically a series of 76 pituitary adenomas. All cases were assessed immunohistochemically and in 49 patients the PCNA monoclonal antibody was measured. The most frequent types found were the bihormonal adenomas, followed by prolactinomas and non secreting adenomas. The bihormonal adenomas, non secreting adenonas and the sub unit alfa producing adenomas were proportionally more invase as determined by radiological criteria (CTscan or MRI). In 59 patients a transphenoidal approach was used, six cases were operated on transcranially and in 11 patients we used a combination of both approach. Total resection were achieved in 32 cases, most of which were microadenomas, in 15 cases the resection was subtotal and partial in 29 cases. Diabetes insipidus was the most frequent endocrine complication. It was observed that secreting adenomas tend to be associated with an increased PCNA and invasive adenomas correlated with PCNA 3 and 4. An improvement in vision was observed in 85% of macroadenomas seen after a total, subtotal or partial resection.