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FIG 4. Matrix patterns show distributions relative to primary tumor volumes, of metastatic nodes at neck levels (I–VI) of patients with oral and maxillary sinus (A) or pharyngeal (B) cancer. The multiplicity of metastatic nodes at each level of the neck is expressed as >50% (dark box) or 
50% (gray box) of patients with corresponding tumor size range (cm3) having multiple nodes at that neck level or as no patient having metastatic nodes at that level (white box).
