<prompt> A 56-year-old man with a history of cigarette smoking presents with difficulty swallowing and a muffled voice. Laryngoscopy reveals a 2-cm laryngeal mass. If this mass is a malignant neoplasm, which of the following is the most likely histologic diagnosis?AdenocarcinomaLeiomyosarcomaSmall cell carcinomaSquamous cell carcinoma  <response>: Squamous cell carcinoma. The vast majority of laryngeal cancers are squamous cell carcinomas and occur principally in smokers. Adenocarcinoma choice A, leiomyosarcoma choice B, and small cell carcinoma choice C are rarely encountered in the larynx.Diagnosis: Laryngeal cancer 