May 2019 Edition. Volume XIX

Terminology Description
       Arachnoiditis This term refers only to the presence of inflammation involving the arachnoid membrane.  Every person in the population has probably experienced some degree of this during their lifetime.
Arachnoid Adhesions This term indicates that some strands of collagen scar are present.  A very common entity which is rarely of clinical significance.
Adhesive Arachnoiditis
Focal adhesive arachnoiditis is commonly
seen following trauma, local surgery, and
focal degenerative spinal problems.  Also fairly common and typically without associated clinical symptoms.
Adhesive Arachnoiditis
Diffuse inflammation of the arachnoid with varying degrees of scarring.  Usually due to a toxic chemical agent having been introduced into the subarachnoid space for diagnostic or treatment purposes. Even when the process is extensive and advanced it may not be associated with clinical symptoms if the individual’s nervous system is given a chance to adjust to the progressive insult.  If acclimization does not occur or is de-stabilized the clinical symptoms of constant, intractable pain can be devastating to the individual.
Adhesive Arachnoiditis
(Class I)
First phase of the diffuse inflammatory process.  A disease entity.
Adhesive Arachnoiditis
(Class II)
Second phase of the diffuse inflammatory process. A disease entity.
Adhesive Arachnoiditis
(Class III)
Most advanced phase of the scarring process (non-calcified).  A disease entity.
Arachnoiditis Ossificans The most advanced phase of the process where the scar tissue begins to calcify.  Progressive nerve root compression is common.  A disease entity.

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