PMC5926216_01
Axial noncontrast CT head 3 years prior to presentation showing right isodense extraaxial fluid collection within bounds of previous craniotomy (Unfortunately, we don't have any history as to why this scan was ordered. It was sent to use as part of the current workup for EDA)
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F1
On follow-up imaging 3 years after his last craniotomy, he underwent head CT showing a small subacute SDH, which was managed nonoperatively [Figure 1].
MRI of the brain without contrast on the day of admission. (a) T1WI showing hyperintense extraaxial fluid collection within the bounds of previous craniotomy on the right side. (b) T2WI showing hyperintense extraaxial fluid collection within the bounds of previous craniotomy on the right side. Both of these findings were consistent with late subacute SDH. (c) DWI shows some diffusion restriction within the extraaxial fluid collection on the right side. This was felt to be nonspecific secondary to history of previous extraaxial blood
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F2
After a multiday admission at the outside hospital for depression with suicidal ideation, he underwent noncontrast MRI because of his prior history of craniotomy, revealing a 1.4 x 2.3 x 3.6 cm right-sided crescent-shaped collection consistent with subacute SDH [Figure 2].