Diagnostic quiz. Case No. 1:  squamous cell carcinoma.
Ronald
R
Baughman
D002294:Carcinoma, Squamous Cell / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005887:Gingival Neoplasms / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged