THE total number of cases represented in this survey of the literature on the subject is 54. In addition, the lesion is briefly discussed in several textbooks on dermatology and some of the treatises on diseases of the mouth and tongue. (See bibliography 25 to 33, inclusive.) Review of Literature.—In 1906, Brocq (1) first mentioned this interesting lesion in a brief paragraph, but it was not until 1914 that he and Pautrier described in detail 17 cases of “glossite losangique mediane de la face dorsale de la langue.” Since then, several authors have contributed case reports, all crediting Brocq and Pautrier (2) with the distinction of being the first to recognize this lesion as a separate entity, not to be confused with lingual manifestations of syphilis, tuberculosis, or neoplasm. Three months after Brocq and Pautrier's original contribution, Jourdanet (3) reported a single case and emphasized the importance of distinguishing this lesion from other lesions of the tongue. In his patient the lesion existed ...