Flattened papillary mass on the posterior hard palate.

An unusually large, asymptomatic, exophytic mass of the palate with a papillary surface architecture--characteristic of an oral squamous papilloma--has been presented. The cause of the squamous papilloma is unknown. Surgical excision, with microscopic examination of removed tissue, is the preferred treatment. Recurrence or malignant change, or both, are unusual.