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Medical Science Monitor Basic Research


Delayed Spontaneous Resolution of a Traumatic Middle Meningeal Artery Pseudoaneurysm

Unusual clinical course, Challenging differential diagnosis, Unusual or unexpected effect of treatment

Jaime L. Atiles, Amanda P. Marrero-González, Eduardo J. Labat

Puerto Rico Department of Diagnostic Radiology, University of Puerto Rico – School of Medicine, San Juan, Puerto Rico

Am J Case Rep 2021; 22:e926852

DOI: 10.12659/AJCR.926852

Available online: 2021-02-11

Published: 2021-03-21


BACKGROUND: Middle meningeal artery (MMA) aneurysms are a very rare entity, comprising less than 1% of all intracranial aneurysms. In particular, traumatic MMA pseudoaneurysms (MMAP) are reported in the literature to have a poor outcome in about 20% of cases. Moreover, in extremely rare cases, MMAPs can spontaneously thrombose.
CASE REPORT: We present the case of a 42-year-old Hispanic man with multiple craniofacial hemangiomas and history of chronic migraines that increased in frequency after blunt head trauma 1 month prior to initial evaluation. CTA and brain MRI showed a right-sided MMAP adjacent to the foramen spinosum with a pan-hemispheric subdural hematoma and no associated skull fractures. The MMAP was not visualized 2 days later on digital subtraction angiography (DSA) and was therefore presumed to be thrombosed. CTA at 3 months showed interval progression of the MMAP with subsequent spontaneous resolution on CTA at 10 months.
CONCLUSIONS: Knowledge regarding MMAPs is limited since it is based on a small number of cases and literature reviews. Additional studies are needed to elucidate the true incidence and natural course of this entity and produce adequate treatment guidelines.

Keywords: Aneurysm, False, Angiography, Digital Subtraction, Craniocerebral Trauma, intracranial aneurysm, Meningeal Arteries