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Lines of Zahn

Immunofluorescence pattern along the basement membrane caused by antibodies targeting the α3 chain of type IV collagen = Linear staining pattern (Goodpasture / anti-GBM disease)


Medial hypertrophy = Vascular histological change characterized by a thickened smooth-muscle layer surrounding a narrowed lumen, associated with pulmonary hypertension

Plexiform lesion = Complex tufted collection of small vascular channels seen in severe, advanced pulmonary arterial hypertension

Golden-brown intracellular pigment seen on H&E within alveolar macrophages after alveolar hemorrhage, highlighted blue by Prussian stain
Hemosiderin = Golden-brown intracellular pigment seen on H&E within alveolar macrophages after alveolar hemorrhage, highlighted blue by Prussian stain


Amniotic fluid embolism = Vascular histological finding of fetal squamous cells within a maternal pulmonary blood vessel following acute postpartum collapse

Diffuse alveolar hemorrhage = Histological presentation where red blood cells directly fill the alveolar airspaces
