PMC8247724_01
Fluctuant region beneath scalp. Note that there is no discoloration, and the collection does not obey suture lines (a). The arrow indicates the edge of fluid collections, which is migratory depending on patient position (b).
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F1
The fluid collection was noted to be fluctuant, free-flowing across the suture lines, without discoloration or bruising skin and when supine, the fluid collected at his midocciput [Figures 1a and b].
The important diagnosis feature showing subaponeurotic fluid collections crossing above the cranial suture (a). Ultrasonography revealed mobile hypodense anechoic fluid collections beneath the scalp aponeurosis without the presence of cyst wall and crossed sagittal suture lines (b).
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F2
Ultrasonography revealed a mobile hypodense anechoic fluid collection beneath the hypoechoic aponeurosis without the presence of cyst wall and crossed sagittal suture lines [Figures 2a and b], internal solid component/active flow signals on color Doppler, and no evidence of fracture.
A diagnostic aspirate tap confirmed the presence of serosanguinous subaponeurotic fluid collections.
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F3
A diagnostic tapping confirmed the presence of serosanguinous fluid [Figure 3]; biochemical results showed glucose 94 mug/dl and albumin 2120 mug/dl with leukocytes 252 cells/mul and Beta2-transferrin positive.