case_images: PMC5857307_01
case_images: (a) Exophytic tumor with a smooth whitish surface on the left buccal mucosa. (b) Lichen planus in the right buccal mucosa and on the tongue; actinic cheilitis is also seen on the lips.
case_images: CRIOT2018-9427650.001.jpg
case_images: PMC5857307_01_CRIOT2018-9427650.001.jpg
case_images: fig1
case_images: The complaints of the patient were burning sensation after hot or spicy foods in the left buccal mucosa and painless swallowing in the left buccal mucosa for 3 months (Figure 1(a)). Clinical examination revealed several plaques and striated white lesions on the tongue and in the left and right buccal mucosae (Figure 1(b)) and an exophytic tumor with a smooth whitish surface on the left buccal mucosa.
case_images: (a) H&E x100: lichen planus with hyperkeratosis, parakeratosis, epidermal hyperplasia, eosinophilic colloid bodies (Civatte), and lymphocytic infiltration at superficial dermis. (b) H&E x10: areas infiltrated with OSCC.
case_images: CRIOT2018-9427650.002.jpg
case_images: PMC5857307_01_CRIOT2018-9427650.002.jpg
case_images: fig2
case_images: Histopathological examination of the lesions showed lichen planus in the right and left buccal mucosae (Figure 2(a)) and oral squamous cell carcinoma (OSCC) in the left buccal mucosa (Figure 2(b)).
case_images: Left buccal mucosa one year after the operation. A scar tissue is present, and there is no sign for relapse.
case_images: CRIOT2018-9427650.003.jpg
case_images: PMC5857307_01_CRIOT2018-9427650.003.jpg
case_images: fig3
case_images: The tumor was removed completely, and the tissue defect on the buccal mucosa was repaired with a split-thickness skin graft.  Figure 3 represents the situation of the left buccal mucosa one year after the operation.