Grade 3 mast cell tumour invading the biceps femoris muscle of the left hind limb of an 11-year-old Boxer. On the left, note how the muscle exhibits strands of white tissue that gives it an unusually firm texture. The right-side image shows the hypertrophied iliac lymph nodes (arrow above the bladder pointing to the smallest lymph node, cranial to the bladder).

 

 

 
 
 
 
 

 

 
 
 
 
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