Non-neoplastic

Autolysis (H&E)

Congestion (H&E)

Immature bone (H&E)

Erythroid & myeloid areas (H&E)

Erythroid-rich area (H&E)

Myeloid-rich area (H&E)

Megakaryocytic hyperplasia

Megakaryocytic hyperplasia (H&E)

Gelatinous transformation (H&E)

Gelatinous transformation (Alcian blue)

Gelatinous transformation (H&E)

Hypocellular (feline, FIP, H&E)

Megakaryocytic dysplasia (feline, FIP, H&E)

Megakaryocyte & erythrophage (feline, FIP, H&E)

Megakaryocyte & erythrophage (feline, FIP, H&E)

Lymphocytes (feline, FIP, H&E)

Lymphocytes (feline, FIP H&E)

Erythrophagia with FIP (feline)

Erythrophage & megakaryocyte

Erythoblastic island