Delayed presentation of traumatic supra- and infratentorial extradural hematoma: illustrative case.

backgroundSupra- and infratentorial epidural hematomas (SIEDHs) are a rare subtype of epidural hematoma (EDH), showing expanding bleeding on both sides of the tentorium, and account for <2% of EDHs (Aji, Apriawan, and Bajamal, 2018). These lesions can typically expand and decompensate quickly, making immediate diagnosis and surgical intervention crucial. OBSERVATIONS: The authors' patient presented >48 hours from a blunt trauma to the right side of the head with progressive vomiting and bruising behind the right ear. He had a Glasgow Coma Scale score of 15 on arrival. Head computed tomography showed an SIEDH measuring approximately 3 cm, and, given the hematoma's size and mass effect, the patient was taken emergently to the operating room for decompression, where the source of bleeding was noted to be an emissary vein from the transverse sinus. The linear parietooccipital fracture was mended with mesh cranioplasty. Patient imaging and follow-up showed an excellent recovery. LESSONS: Although SIEDH is rare, patients can present in a delayed fashion and be neurologically intact. The threshold to obtain imaging to rule out delayed hemorrhage should be low in any patient with a history of trauma in the region of a dural venous sinus.