Figure 2.

Different degrees of small pulmonary vasculitis were showed under HE staining. A, Vessel wall was infiltrated by lymphocytes, but the lumen is still maitain without obstruction(100×); B, Epithelioid granuloma invaded small vessel wall, broke into the lumen, more than 60% of the lumen was obstructed (100×); C, Last stage of epithelioid granulomatous vasculitis with thickening vessel wall as well as severe narrow lumen. Epithelioid granuloma invaded the vessel wall with messed vascular structures, lumen atresia (200×).

Huang et al. Diagnostic Pathology 2013 8:79   doi:10.1186/1746-1596-8-79
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