The Ro-lung Stones The Stones’ ‘Hot Lips’ logo formed from a bloo

The Ro-lung Stones 

The Stones’ ‘Hot Lips’ logo formed from a blood vessel filled with erythrocytes within a congested zone around a focal pneumonia of the lung.

During the first stages of focal/lobar pneumonia macrophages (the larger cells that are visible in the white alveolar space) respond to phagocytose (eat) any pathogens in the lung.

Additionally, the small blood vessels within the lung tissue begin to engorge (you can see all the erythrocytes in the dilated vessels not only in the large 'hot lips’ vessel but the smaller vessels in the interalveolar septa between adjacent alveoli). This is the congestion phase.

With this dilation of vessels come more white blood cells, you can see numerous neutrophils (they are the small cells that look like they have multiple lobes to their purple nuclei) have migrated out of the vessels (a process called extravasation) into the surround tissue and alveolar spaces. These cells are signs of an additional immune response and they help the macrophages destroy pathogens in the airway. 

Image is by @beautiful_pathologist - check out her Instagram for more histology.