System: Lower Respiratory : Lung: Indeterminant: Atypical Alveolar Hyperplasia
irregularly bordered focal proliferation of alveolar cells spreading along the preexisting alveolar framework Image
prominent cuboidal to low columnar alveolar epithelial cells with variable atypia but less than that in adenocarcinoma; enlarged cell size and increased nuclear-cytoplasmic ratio with hyperchromasia and prominent nucleoli, Image
Images courtesy of Dr. Jeff Myers, University of Michigan.