PMC5820825_01
T1-weighted magnetic resonance imaging with contrast enhancement before tumour removal. The images revealed a supratentorial and infratentorial mass with a cyst. (a) Coronal view (b) Axial view
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F1
An asymptomatic 71-year-old woman was diagnosed with a left supratentorial and infratentorial dermoid cyst on screening magnetic resonance imaging (MRI) [Figure 1] and admitted to our hospital.
Postoperative imaging findings. (a) T1-weighted magnetic resonance imaging without enhancement 6 months postoperatively showed low signal intensity within the cavity. (b and c) Computed tomography 6 months postoperatively showed low density in the supratentorial and infratentorial cavities
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F2
The patient was followed-up by the outpatient service and developed no recurrence or any abnormal imaging signals in the residual cavity [Figure 2].
Imaging findings upon admission. (a) T1-weighted magnetic resonance imaging with contrast enhancement on admission showed a signal change from low to mildly high within the cavity. (b) Computed tomography on admission revealed low and iso-density of the infratentorial lesion with compression of the brain stem. (c) The supratentorial lesion also exhibited mixed density on computed tomography
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F3
A CT scan revealed enlargement of the hematoma in the posterior fossa and compression of the brain stem [Figure 3].
Intraoperative and postoperative findings. (a) Intraoperative image after dural incision shows the outer membrane of the haematoma on the cerebellar hemisphere. (b and c) Computed tomography after haematoma evacuation shows removal of the haematoma and resolution of the brain stem compression. (d) Postoperative MRI shows signal change in the cavity
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F4
The tension in the posterior fossa was high, and the outer membrane was seen under the dura mater [Figure 4a]. Postoperative CT scans of the head revealed disappearance of the CSDH in both the supratentorial and infratentorial spaces [Figure 4b and c]. Signal change was also confirmed on postoperative MRI [Figure 4d].