canalicular adenoma

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can·a·lic·u·lar ad·e·no·ma

a variant of monomorphic adenoma composed of double rows of epithelial cells in long cords.
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Canalicular adenomas are benign neoplasms with a unique predilection for the upper lip (~80% of cases).
Canalicular adenomas are typically smaller than 2 cm.
Based on this month's Pathology Clinic, by Penner and Thompson, approximately what percentage of cases of canalicular adenomas occur in the upper lip?