PMC8814101_01
(A) Patient 1 is a 56-year-old female. No significant abnormalities were observed by the baseline MRA. MRA reexamination about 4 years later showed a newly formed saccular aneurysm with a diameter of 3.2 mm in the left posterior communicating artery. CTA showed that the aneurysm had significantly increased in size, reaching a diameter of 6.9 mm. (B) Patient 2 is a 47-year-old female. No significant abnormalities were observed by the baseline MRA. A newly formed basilar tip aneurysm and aneurysmal enlargement were observed in the subsequent MRA examinations at follow-up (from 2.1 to 3.8 mm in diameter). Registration of 3D surfaces with different degrees of transparency showed changes on continuous follow-up angiography.
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F1
Cranial magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA) assessments did not reveal obvious abnormalities (Figure 1A, Baseline), and the patient's symptoms resolved spontaneously without any interventions. MRA reexamination of the patient 4 years later (October 9, 2018) showed a newly formed saccular aneurysm with a diameter of 3.2 mm in the left posterior communicating artery (Figure 1A, Formation). CT angiography (CTA) showed that the aneurysm had significantly increased in size, reaching a diameter of 6.9 mm (Figure 1A, Rupture). A newly formed basilar tip aneurysm and aneurysmal enlargement were observed in the follow-up MRA examinations performed on October 9, 2018 (Figure 1B, Formation), and June 7, 2020 (Figure 1B, Growth; from 2.1 to 3.8 mm in diameter), respectively.