abnormal enlargement of the air sacs in the lungs

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways