pulmonary papillary adenocarcinoma
In the past, tumors with prominent papillary architecture were classified as BAC. There is increasing evidence, however, that tumors with papillae with secondary and tertiary branching of the papillae may have a worse prognosis than other adenocarcinomas. In the WHO 2004 system, papillary adenocarcinomas are classified separately.
In the 2011 new classification scheme, papillary tumors are divided into papillary and micropapillary, the latter having a particularly poor prognosis.
See also
pulmonary adenocarcinomas