NBDHE Review Questions: Quiz 222 May 11, 2016 by Hassan Shah A painful, crater-like, 1.5 cm. ulcer developed within one week in the mucosa of the left hard palate of a 40-year-old woman. The most likely diagnosis is A. actinomycosis. B. pleomorphic adenoma. C. squamous cell carcinoma. D. adenoid cystic carcinoma. E. necrotizing sialometaplasia Δ