Histology
Low power (fig. 1, 40x) - An unencapsulated inflammatory lesion involving the testicular hilum and parenchyma, with residual normal parenchyma (left) and paratesticular/cord structures (right).
Medium power (fig. 2, 100x) - Angular zones of brightly eosinophilic necrosis with palisading inflammatory cells, including abundant epitheliod histiocytes (activated macrophages).
High power (fig. 3 and 4, 400x) - Zones of necrosis with palisading epithelioid histiocytes (fig. 3) and scattered multinucleate giant cells (fig. 4).