Medicine:Pneumocephalus
| Pneumocephalus | |
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| Pneumocephalus and comminuted fracture of the frontal sinus |
Pneumocephalus is the presence of air or gas within the cranial cavity. It is usually associated with disruption of the skull: after head and facial trauma, tumors of the skull base, after neurosurgery or otorhinolaryngology, and rarely, spontaneously. Pneumocephalus can occur in scuba diving, but is very rare in this context.
If there is a valve mechanism which allows air to enter the skull but prevents it from escaping, a tension pneumocephalus can occur (similar to what can happen in a tension pneumothorax).
CT scans of patients with a tension pneumocephalus typically show air that compresses the frontal lobes of the brain, which results in a tented appearance of the brain in the skull known as the Mount Fuji sign.[1][2][3] The name is derived from the resemblance of the brain to Mount Fuji in Japan , a volcano known for its symmetrical cone. In typical cases, there is a symmetrical depression near the midline (such as the crater of a volcano), due to intact bridging veins.[3] Its occurrence seems to be limited to tension pneumocephalus (not occurring in pneumocephalus without tension).[4] The sign was first described by a team of Japanese neurosurgeons.[5]
Pneumocephalus has also been shown to follow neurosurgical procedures such as deep brain stimulation and hematoma evacuation (e.g., chronic subdural hematoma[6]), where while seemingly innocuous to the patient, may cause brain shift, subsequent stereotactic inaccuracy, and even another surgical intervention.[7][8] Regarding chronic subdural hematoma (CSDH) surgery, a postoperative volume of pneumocephalus greater than 15mL puts a patient at increased risk of CSDH recurrence; in fact, for every milliliter of air entering the cranial cavity after CSDH evacuation, the recurrence risk increases by 4%.[9] Efforts are made by neurosurgeons to reduce pneumocephalus volume during surgery, and thus, subsequent brain shift.
Additional images
Large pneumocephaly secondary to surgical wound
Pneumocephaly
Footnotes
- ↑ Michel SJ (August 2004). "The Mount Fuji sign". Radiology 232 (2): 449–50. doi:10.1148/radiol.2322021556. PMID 15286317.
- ↑ Sadeghian H (September 2000). "Mount Fuji sign in tension pneumocephalus". Archives of Neurology 57 (9): 1366. doi:10.1001/archneur.57.9.1366. PMID 10987907. http://archneur.ama-assn.org/cgi/pmidlookup?view=long&pmid=10987907.[yes|permanent dead link|dead link}}]
- ↑ 3.0 3.1 "Images in clinical medicine. The Mount Fuji sign". The New England Journal of Medicine 350 (18): 1881. April 2004. doi:10.1056/NEJMicm020479. PMID 15115834.
- ↑ "Subdural tension pneumocephalus following surgery for chronic subdural hematoma". Journal of Neurosurgery 68 (1): 58–61. January 1988. doi:10.3171/jns.1988.68.1.0058. PMID 3335913.
- ↑ "[Subdural tension pneumocephalus following surgery of chronic subdural hematoma]" (in ja). No Shinkei Geka. Neurological Surgery 15 (4): 419–24. April 1987. PMID 3614535.
- ↑ Mignucci-Jiménez, Giancarlo; Matos-Cruz, Alejandro J.; Preul, Mark C.; Feliciano-Valls, Caleb E. (1 September 2022). "Association between postoperative pneumocephalus and chronic subdural hematoma recurrence: A single-center population-based study in Puerto Rico" (in en). Interdisciplinary Neurosurgery 29: 101578. doi:10.1016/j.inat.2022.101578. ISSN 2214-7519.
- ↑ Elias, W. Jeffrey; Fu, Kai-Ming; Frysinger, Robert C. (2007-11-01). "Cortical and subcortical brain shift during stereotactic procedures". Journal of Neurosurgery 107 (5): 983–988. doi:10.3171/JNS-07/11/0983. ISSN 0022-3085. PMID 17977271.
- ↑ Sharim, J; Pezeshkian, P; DeSalles, A; Pouratian, N (2015-10-01). "Effect of Cranial Window Diameter During Deep Brain Stimulation Surgery on Volume of Pneumocephalus". Neuromodulation: Technology at the Neural Interface 18 (7): 574–579. doi:10.1111/ner.12328. ISSN 1525-1403. PMID 26222380.
- ↑ Mignucci-Jiménez, Giancarlo; Matos-Cruz, Alejandro J.; Preul, Mark C.; Feliciano-Valls, Caleb E. (1 September 2022). "Association between postoperative pneumocephalus and chronic subdural hematoma recurrence: A single-center population-based study in Puerto Rico" (in en). Interdisciplinary Neurosurgery 29: 101578. doi:10.1016/j.inat.2022.101578. ISSN 2214-7519.
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