Prenatal diagnosis of atraumatic fetal subdural hematoma.

We present a case of atraumatic subdural hematoma diagnosed by ultrasound at 22 weeks. A hyperechogenic round mass was identified in the posterior fossa. Further investigation with fetal brain magnetic resonance imaging confirmed the diagnosis. After medical consultation, the parents opted for pregnancy termination. The pathology report confirmed the ultrasonographic and magnetic resonance imaging diagnosis.