The nature of that peculiar form of inflammation of the dura mater, known as pachymeningitis interna hemorrhagica, has long been a subject of discussion and study. But the process or processes are so unique and so different from other inflammations that most questions in regard to this disease still remain unsettled. The description of the microscopic structure of the dura by Key and Retzius twenty-five years ago remains true now. The membrane is composed largely of collagenous fibers mixed with more or less elastic tissue which, according to Melnikow-Raswedenkow,1 increases in amount with advancing years. According to the recent investigations of this author the external and internal surfaces of the dura are covered with elastic lamellæ or limiting membranes. Upon the internal surface of the inner of these layers we have the epithelial lining of the dura. There are capillary networks near both the limiting membranes. It will be
INTERNAL HEMORRHAGIC PACHYMENINGITIS. JAMA. 1900;XXXV(10):630. doi:10.1001/jama.1900.02460360036011
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