The definition of a pseudotumor is something that looks like a neoplasm—but isn’t. “Intracranial inflammatory pseudotumor” (IIPT) is an umbrella term that encompasses a spectrum of nonneoplastic infectious, reactive and/or reparative processes that are characterized histopathologically by mass-like cellular aggregates consisting of polyclonal mononuclear infiltrates in a prominent fibrocollagenous stroma. Some IIPTs are idiopathic but a growing number have recognized causes such as IgG4-related disease. In this presentation we delineated 5 major anatomic patterns of IIPTs, each with its distinctive imaging findings and associated pathologies. We emphasize the falcotentorial/posterior fossa pattern and the “Eiffel by night” sign on coronal contrast-enhanced T1-weighted MR. At least half of these cases are associated with chronic dural sinus thrombosis. In the anterior pattern (orbital apex, superior orbital fissue/cavernous sinus ± dura), orbital pseudotumor, IgG4-RD and inflammatory myofibroblastic tumors predominate. Focal rather than diffuse dura-arachnoid thickening is seen with intracranial inflammatory myofibroblastic tumors, a recently-recognized entity that can be associated with invasion of the underlying brain.
Osborn, A. G. (2018). Intracranial Pseudotumors: Making Sense Of The Maddening Mystery. Iranian Congress of Radiology, 34(3), 80-80. doi: 10.22034/icrj.2018.75507
MLA
Anne G. Osborn. "Intracranial Pseudotumors: Making Sense Of The Maddening Mystery". Iranian Congress of Radiology, 34, 3, 2018, 80-80. doi: 10.22034/icrj.2018.75507
HARVARD
Osborn, A. G. (2018). 'Intracranial Pseudotumors: Making Sense Of The Maddening Mystery', Iranian Congress of Radiology, 34(3), pp. 80-80. doi: 10.22034/icrj.2018.75507
VANCOUVER
Osborn, A. G. Intracranial Pseudotumors: Making Sense Of The Maddening Mystery. Iranian Congress of Radiology, 2018; 34(3): 80-80. doi: 10.22034/icrj.2018.75507