Fernando, A.F., Lapeña, J.F.F. and Maglalang, G.M. 2010. The Black Sombrero: A Helpful Landmark in Axial Imaging Evaluation of the Larynx and Hypopharynx. Philippine Journal of Otolaryngology Head and Neck Surgery. 25, 2 (Dec. 2010), 46–48. DOI:https://doi.org/10.32412/pjohns.v25i2.637.