[Hemangioperocytoma in the infant. A histogenetic study].

Two children with hemangiopericytomas are reported-one with a congenital tumor, the second hemangiopericytoma was noticed during the first trimenon. Histologically there was no obvious difference to the hemangiopericytomas in adults. Tumor immaturity should not be seen as a nondifferentiation but as an embryonal immaturity. In analogy to other reticulo-histiocytic proliferations, reticular fibers, shown by silver impregnation, can be demonstrated in both cases. The silver stain should not be over-rated in its diagnostic and prognostic significance.