Fig. 2

Representative MRI images of head and neck squamous cell carcinoma patients whose Ki-67 expression levels were determined as being low and high. A A 67-year-old male patient with a visible mass in the hypopharynx. The immunohistochemical image presented a low Ki-67 expression level (× 200; Ki-67 index = 20%). B A 62-year-old male patient with a visible mass in the hypopharynx. The immunohistochemical image presented a high Ki-67 expression level (× 200; Ki-67 index = 90%). MRI, magnetic resonance imaging