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This volume of 74 pages is a doctoral thesis. In the first three chapters, anatomic, physiologic and histologic considerations of the nasopharynx are presented. There is also a chapter concerning anatomicopathologic studies on the several types of tumors that may develop in the nasopharynx. The methods in use for the examination of the nasopharynx as well as for the differential diagnosis are reviewed. The author believes that the histologic constitution of the nasopharynx is the substratum for the several anatomicopathologic forms of nasopharyngeal tumors the development of which is favored by unknown causes. The architecture, physiology and anatomic relations of the nasopharynx explain the symptoms presented by tumors that develop in that region. The symptoms given by nasopharyngeal tumors point out the presence of any of the following five clinical forms of tumors: the nasal, the auricular, the ganglionar, the ocular and nervous and the mixed form. The mixed form