PMC4531616_01
Photography shows poorly defined mass lesion at laterally to semi-membranous tendon, anterior to gastrocnemius and along joint space. This mass demonstrates low signal intensity with high signal foci on T1WI/PDWI (A) and patch peripheral enhancement on Gadolium-enhanced T1WI (B, C).
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Ultrasonography and magnetic resonance image (MRI) around the right knee showed a poorly defined mass lesion laterally to the semi-membranous tendon, anteriorly to the gastrocnemius muscle on the right leg (Figure 1).
Microphotography shows prominent caseous necrosis and surrounding granuloma composed of epitheloid histiocytes and inflammatory cells (big box). The AFB stain shows Mycro-bacterium organisms (arrows, small box).
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Pathologic findings of the specimen disclosed caseous central necrosis surrounding the granuloma (Figure 2).