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 Indian J Med Microbiol  
 

Figure 18 (A and B): An example of a T2 squamous cell carcinoma of the oral tongue with positive deep margin, indicating that the depth of invasion may be underestimated. (A) The apparent depth of invasion is 7mm; however, the deep margin is involved by carcinoma (hematoxylin and eosin (H and E), original magnification ×20). (B) Carcinoma at deep margin. Hypothetically, if there is additional 4mm (along the “plumb line”) of residual carcinoma in the tumor bed, this carcinoma is more appropriately staged as T3 (H and E, original magnification ×100)

Figure 18 (A and B): An example of a T2 squamous cell carcinoma of the oral tongue with positive deep margin, indicating that the depth of invasion may be underestimated. (A) The apparent depth of invasion is 7mm; however, the deep margin is involved by carcinoma (hematoxylin and eosin (H and E), original magnification ×20). (B) Carcinoma at deep margin. Hypothetically, if there is additional 4mm (along the “plumb line”) of residual carcinoma in the tumor bed, this carcinoma is more appropriately staged as T3 (H and E, original magnification ×100)