Distinguishing this condition from other diseases that can cause CDI, such as craniopharyngioma, germinoma, sarcoidosis, hypophysitis, and tuberculosis, is essential [2, 10, 26], and the pathological signature with both CD1a-positive, Langerin-positive, and S-100-positive infiltrating histiocytes and increased presentation of eosinophils has made the differential diagnosis relatively easy. This evidence concerns the gene CD1A and germinoma.