The arachnoid membrane is separated from the dura by the subdural and from the pia by the subarachnoid space. The latter, traversed by numerous trabeculae, is the container of the cerebrospinal fluid. Under pathologic conditions, such as observed among others by Mauss and Krüger1 in twenty-three operative cases, membrane-like bands form between the arachnoid and the pia; or portions of the latter become adherent to the arachnoid membrane, occluding whole sectors of the subarachnoid space. The resulting conditions—cysts, thickenings of the pia-arachnoid and adhesions—interfere with the free circulation of the cerebrospinal fluid. Clinically they are known as adhesive circumscribed arachnoiditis, chronic spinal meningitis (Horsley), circumscribed edema of the arachnoid spaces, serous spinal meningitis and leptomeningeal cysts.
Though mentioned by Schlesinger,2 the foregoing pathologic conditions did not attract attention until the publication of a contribution by Spiller, Musser and Martin3 and the subsequent surgical reports of Horsley4
HASSIN GB, ANDREWS E. SEROUS SPINAL MENINGITIS (CIRCUMSCRIBED): REPORT OF TWO CASES. JAMA. 1929;92(11):877–880. doi:10.1001/jama.1929.02700370025007
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