Polymorphous low-grade adenocarcinoma in the upper lip: A well-described but infrequently recognized tumor

1. Andreu-Barasoain, M.
2. Vicente-Martín, F.J.
3. Gómez de la Fuente, E.
4. Salamanca-Santamaría, J.
5. Pampín-Franco, A.
6. López-Estebaranz, J.L.