Trotter's triad is seen in
Nasopharyngeal carcinoma
Maxillary sinusitis
Maxillary carcinoma
Angiofibroma
Nasopharyngeal cancer can cause conductive deafness (eustachian tube blockage), ipsilateral temporoparietal neuralgia (involvement of CN V) and palatal paralysis (CN X)-- collectively called Trotter's triad. (Ref: Diseases of Ear, Nose and Throat, PL Dhingra, 7th edition, page 285)
Pharynx