All ung specimens of the cases revealed considerable amonnt of meconium body and keratosic pithelial cells, in any levels of bronchi, alveolar ducts, alveolar sacs and pulmonary lveoli.

• 镜下全部病例肺片均可在各级细支气管、肺泡管、肺泡囊及肺泡内见到较多的胎粪小体及角化上皮细胞。