Leptomeningitis

…This is what is commonly known as meningitis, also known as cerebrospinal meningitis. Inflammation of the meninges is broadly divided into pachymeningitis, which affects the dura mater, and leptomeningitis, which affects the arachnoid mater and pia mater, but the latter accounts for the majority of meningeal inflammation and is usually simply called meningitis. Many pathogenic microorganisms, including bacteria, fungi, and viruses, are known to be the cause of the disease. …

*Some of the terminology that mentions "leptomeningitis" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…いわゆる脳膜炎のことで，脳脊髄膜炎ともいう。髄膜の炎症は硬膜を侵す硬膜炎pachymeningitisとくも膜，軟膜を侵す軟膜炎leptomeningitisに大別されるが，後者が髄膜の炎症の大部分を占め，通常単に髄膜炎と呼ばれる。病因としては細菌，真菌，ウイルスなど多数の起炎菌が知られている。…

※「leptomeningitis」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報