Twelve adenomatoid tumors of the male genital tract are reported; three of them locally invaded the adjacent testis. These cases are compared with two previously reported instances of invasion. No evidence has been found to suggest that those tumors showing local invasion behave differently from the usual adenomatoid tumors. The presence of such invasion should be recognized as a problem in frozen section diagnosis. In view of these observations only local excision of the tumor appears to be indicated.

Summary PCA reactions were produced in guinea pigs with rabbit γG- and guinea pig γG1-antibodies. The histologic picture of PCA reactions with guinea pig γG1 in guinea pigs is similar to the reaction produced with rabbit antibodies. PCA reactions with rabbit and guinea pig γG1-antibodies were partially inhibited by an antihistamine (Neo-Antergan) to the same degree. Depletion of PMN did not diminish the PCA reactions with either antibody. It has been concluded that PMN infiltration is a consequence, and not the determining factor, of PCA reactions in guinea pigs.