It seems to represent a benign adnexal neoplasm of uncertain histogenesis, both of pilosebaceous and eccrine origin have been suggested. 皮肤淋巴腺瘤被认为是一种良性的皮肤附属器肿瘤，其组织发生来源仍然不明，目前被认为可能的来源有毛囊与皮脂腺或是汗腺。
The exact histogenesis of high-grade urothelial tumors may be difficult to ascertain in metastatic sites.Clinical information may be of tremendous value in such cases. 如果此高级别尿路上皮肿瘤发生转移，转移灶内瘤细胞的组织发生会很难确定，此时临床病史尤为重要。
