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Figure 1: At the beginning, brain CT scan in Emergency Room showed left frontal convexity SAH (a, arrowhead) and mild bilateral frontal hygroma (b, arrows). After 2 days, FLAIR MRI confirmed SAH (c, arrowhead); T1 postcontrast MRI showed the mild bilateral frontal hygroma and diffuse pachymeningeal enhancement (DPE) (d, arrowheads). Four months later, FLAIR MRI showed cortical SAH disappearance (e) and T1 MRI revealed decreased DPE and frontal hygroma (f)

Figure 1: At the beginning, brain CT scan in Emergency Room showed left frontal convexity SAH (a, arrowhead) and mild bilateral frontal hygroma (b, arrows). After 2 days, FLAIR MRI confirmed SAH (c, arrowhead); T1 postcontrast MRI showed the mild bilateral frontal hygroma and diffuse pachymeningeal enhancement (DPE) (d, arrowheads). Four months later, FLAIR MRI showed cortical SAH disappearance (e) and T1 MRI revealed decreased DPE and frontal hygroma (f)