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36‐Year‐Old Man with Parietal Scalp Mass

A 36-year-old man, with personal history of a right parietal cranial injury, was admitted for an evaluation of a right parietal mass that had slowly increased in the 9 years prior to this presentation. General examination disclosed nothing. Skull examination revealed a palpable pulsatile and soft swelling. Routine laboratory tests were unremarkable. CT and magnetic resonance imaging MRI of the head were obtained to delineate the large mass in the parietal region. MRI showed a prominent extracranial scalp vein in direct communication with the superior sagittal sinus, through a right parietal bone defect. CT scan showed an old fracture with osteomeningeal breach. There was no parenchymal abnormality. The lesion was heterogeneously intense on T2(Figure 1a), T2-Flair (Figure 1b) and T1-weighted images (Figure 1c). Doppler sonography found vascular structures composing this lesion. Due to the worsening pain at the site of her swelling, a total resection was performed. Intraoperatively, the lesion was defined by the surgeon as a bloodfilled sac within the pericranium and directly overlying the bone suggesting an angioma.