Adenoid cystic carcinoma.
Two distinct types of 'hole' are present:
'A' - spaces due to stromal invagination
'B' - spaces due to true ductal differentiation - picked out by CK7 immunostaining
Two distinct types of 'hole' are present:
'A' - spaces due to stromal invagination
'B' - spaces due to true ductal differentiation - picked out by CK7 immunostaining