PMC9880008_01
Three images of the affected area in case 1. (A), Features of osteomyelitis caused by Nocardia otitidiscaviarum; (B), Magnetic resonance imaging manifestation of chronic osteomyelitis; (C), Pathological examination of septic changes under a 10*20x microscope.
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A physical examination showed several sinus tracts of approximately 0.3 cm in diameter on the anterior and medial sides of the right thigh, a small amount of yellowish exudation, and local tenderness, as shown in Figure 1A. The magnetic resonance imaging (MRI) results showed discontinuous signal intensity in the right femoral bone, local cortical thickening, a less uniform signal intensity in the medullary cavity, a dot-like slightly long T2 signal, and an abnormal shape and signal intensity in the right femur, which is consistent with the chronic osteomyelitis findings shown in Figure 1B.  The pathology results showed acute and chronic inflammatory cell infiltration in the fibroadipose tissue of the mass, with small vessel hyperplasia, which is consistent with suppurative inflammatory changes, as shown in Figure 1C.