Figure 2 Intraoperative imaging and schematic diagram of a subdural hematoma after lumbar puncture in a patient with coagulation disorder following sinus thrombosis. (A–D) Intraoperative imaging: (A) Three stitches in the dorsal dura. (B) A massive hematoma pressing on the cauda equina. (C) Two stitches were visible in the ventral dura. (D) The ventral dorsal needle holes can be matched. (E–G) Schematic diagram: (E) The ventral and dorsal dural membranes were punctured, while a large amount of cerebrospinal fluid was released in a short time. (F) The dural sac deflates, creating negative pressure, and blood is aspirated into the dural through the stitches by puncturing the anterior vertebral venous plexus. (G) Subdural hematoma is formed and presses on the cauda equina, causing neurological impairment. Illustration created by the authors.