Trismus originating from rare fungal myositis in pterygoid muscles: A case report

Figure 1 Obvious enlargement of the left side pterygoid muscles appear on computed tomography scanning. The boundary of the lateral and medial pterygoid muscles is obscure. Bone destruction and thickened mucous membrane on the maxilla sinus back wall appear as well (arrow).

Figure 2 Patchy enhancement is observed in the pterygoid muscles after injection of the contrast agent (arrow).

Figure 3 Pathological section shows diffuse fungi among the muscle cells. The section also shows focal necrosis with inflammatory cell infiltration (periodic acid-Schiff stain, × 400 magnification).

Figure 4 A fluorescence staining section of the surrounding necrotic tissue shows fungal hyphae (fungal fluorescence stain, × 400 magnification).