Congestion in the first 24 hours: This stage is characterized histologically by vascular engorgement, intra-alveolar fluid, small numbers of neutrophils, often numerous bacteria.

It is characterized histologically by a thin myoepithelium.

It is characterized histologically by smooth muscle hypertrophy and basement membrane thickening.

Generalized trichoepitheliomas are characterized histologically by replacement of the hair follicles by trichoepithelioma-like epithelial proliferations associated with hyperplastic sebaceous glands.

This phase is characterized histologically by the absence of acute lesions and the presence of LOS of successive morphologies.

It is histologically characterized by clusters and cords of epithelioid, GFAP-expressing tumor cells within a variably mucinous stroma typically containing a lymphoplasmacytic infiltrate.

Hypodysplasia (RHD): Characterized histologically by reduced number of nephrons, smaller kidney size, or disorganized tissue.

Multicystic Dysplastic Kidney: Characterized histologically, displaying cysts or dysplasia.

This is further characterized histologically by the presence of Auer rods and epigenetically by lysine acetylation on residues 24 and 43.

Intraepidermal neutrophilic IgA dermatosis is characterized histologically by intraepidermal bullae with neutrophils, some eosinophils, and acantholysis.