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Clinical and imaging characteristics of study population
Characteristics Patient
1 2 3 4 5 6
General 
Age (yr)/sex 50/M 39/M 79/F 70/F 48/F 30/M
Presentation HA HA ICH ICH HA, SZ HA
CT 
    Side L R R R R R
    Ca²⁺ distribution^a C + P C + P^b C + P^b C + P C + P C + P
CTA NA DVA, otherwise negative NA AVM, DVA; otherwise negative Large DVA with venous restriction NA
MR imaging 
    Mass effect – – – – –^c –
    T₂ Change – – – – NA –
    DVA drainage Deep Deep Deep Deep Deep Deep
Angiography 
    Venous restriction NA – NA – + NA
Additional features Ipsilateral prominence of frontal horn Ipsilateral prominence of frontal horn, Ipsilateral prominence of frontal horn, Ipsilateral prominence of frontal horn, 
2nd DVA, periphery right frontal lobe Right frontal lobar ICH Right frontal/parietal lobar ICH 
Note:— –indicates negative.
a Preferential calcification of the caudate and anterior putamen was noted in all cases, with at least partial sparing of the anterior limb of the internal capsule.
b Trace high density of the globus pallidus interna was noted, characteristic of senescent mineralization, involving the globus pallidus interna on the left in case 2 and bilaterally in case 3.
c MR imaging was not available; cross-sectional assessment was performed by CT and CTA.