Pachymeningeal enhancement, also known as dura-arachnoid enhancement 4, refers to a dural and outer layer of arachnoid pattern of enhancement seen following contrast administration and may occur in the conditions listed below:
- intracranial hypotension
- postoperative states
- idiopathic pachymeningitis
- cerebral venous thrombosis
- extramedullary haematopoiesis
- rheumatoid arthritis
It is important to note that the thin arachnoid membrane is attached to the inner surface of the dura mater, and so the pachymeningeal pattern of enhancement can also be described as a dura-arachnoid enhancement 3.
On the other hand, the enhancement of the brain surface is also called as pial or pial-arachnoid enhancement, often referred to as leptomeningeal enhancement 3.
- 1. Smirniotopoulos JG, Murphy FM, Rushing EJ et-al. Patterns of contrast enhancement in the brain and meninges. Radiographics. 2007;27 (2): 525-51. doi:10.1148/rg.272065155 - Pubmed citation
- 2. Tosaka M, Sato N, Fujimaki H et-al. Wave-like appearance of diffuse pachymeningeal enhancement associated with intracranial hypotension. Neuroradiology. 2005;47 (5): 362-7. doi:10.1007/s00234-005-1366-8 - Pubmed citation
- 3. Mohan S, Jain KK, Arabi M et-al. Imaging of meningitis and ventriculitis. Neuroimaging Clin. N. Am. 2012;22 (4): 557-83. doi:10.1016/j.nic.2012.04.003 - Pubmed citation
- 4. Dietemann JL, Correia Bernardo R, Bogorin A et-al. Normal and abnormal meningeal enhancement: MRI features. J Radiol. 2006;86 (11): 1659-83. Pubmed citation