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online © ML Comm www.jkns.or.kr 10.3340/jkns.2009.45.5.318 Print ISSN 2005-3711 On-line ISSN 1598-7876 J Korean Neurosurg Soc 45 : 318-321, 2009 Copyright © 2009 The Korean Neurosurgical Society Case Report Extensive Tension Pneumocephalus Caused by Spinal Tapping in a Patient with Basal Skull Fracture and Pneumothorax Seung Hwan Lee, M.D.,1 Jun Seok Koh, M.D.,1 Jae Seung Bang, M.D.,1 Myung Chun Kim, M.D.2 Departments of Neurosurgery,1 Emergency Medicine,2 East-West Neo Medical Center, Kyung Hee University, School of Medicine, Seoul, Korea Tension pneumocephalus may follow a cerebrospinal fluid (CSF) leak communicating with extensive extradural air. However, it rarely occurs after diagnostic lumbar puncture, and its treatment and pathophysiology are uncertain. Tension pneumocephalus can develop even after diagnostic lumbar puncture in a special condition. This extremely rare condition and underlying pathophysiology will be presented and discussed. The authors report the case of a 44-year-old man with a basal skull fracture accompanied by pneumothorax necessitating chest tube suction drainage, who underwent an uneventful lumbar tapping that was complicated by postprocedural tension pneumocephalus resulting in an altered mental status. The patient was managed by burr hole trephination and saline infusion following chest tube disengagement. He recovered well with no neurologic deficits after the operation, and a follow-up computed tomography (CT) scan demonstrated that the pneumocephalus had completely resolved. Tension pneumocephalus is a rare but serious complication of lumbar puncture in patients with basal skull fractures accompanied by pneumothorax, which requires continuous chest tube drainage. Thus, when there is a need for lumbar tapping in these patients, it should be performed after the negative pressure is disengaged. KEY WORDS : Pneumocephalus ˙ Pneumothorax ˙ Spinal tapping. INTRODUCTION being thrown from his car when his pick-up truck rolled over. He arrived at the emergency room complaining of Pneumocephalus occasionally develops in patients with headache, dyspnea associated with chest pain, and back pain. basal skull fractures. However, extensive tension pneumo- On admission, he was alert and showed no hemiparesis. cephalus secondary to head trauma is rare, and its etiology However, no direct light reflex was elicited in the right is controversial. There have been previous reports of tension pupil, but the indirect reflex was intact. The initial brain pneumocephalus of otogenic origin resulting from conti- computed tomography (CT) scan showed a small amount nuous lumbar drainage or CSF fistulae1,5,6). of epidural hematoma with an isolated pocket of air in the We report a patient who developed extensive tension right frontal area (Fig. 1A). Facial bone CT revealed pneumocephalus that required surgery after undergoing a multiple fractures in the frontal sinus, nasal bone, and diagnostic spinal tap. The pathophysiology and manage- glabella (Fig. 1B). A chest CT scan was also performed and ment of this clinical entity is discussed with a pertinent demonstrated extensive pneumothorax associated with literature. multiple rib fractures (Fig. 1C). The hematoma collection and basal skull fracture were CASE REPORT managed conservatively, and the pneumothorax (mainly in the left chest) was treated by placement of a chest tube that A 45-year-old man experienced severe head trauma after was connected to a four-chamber system with negative pressure (-20 cmH2O). One week after the injury, he com- • Received : December 17, 2008 • Accepted : April 26, 2009 plained of headache and presented with fever, the cause of • Address for reprints : Jun Seok Koh, M.D. Department of Neurosurgery, East-West Neo Medical Center, Kyung which was suspected to be a central nervous system (CNS) Hee University, School of Medicine,149 Sangil-dong, Gangdong-gu, infection secondary to basal skull fracture. After confirming Seoul 134-090, Korea - Tel : +82-2-440-6145, 6286, Fax : +82-2-440-8404 the absence of an abnormality on contrast enhanced brain E-mail : [email protected] CT, a spinal tap was performed to analyze the cerebrospinal 318 Pneumocephalus by Spinal Tapping | SH Lee, et al. found in the CSF. About 5 cc of CSF was obtained for further analysis. Three days after lumbar puncture, the patient became obtunded and leth- argic, yet could be aroused. An emer- gent CT scan detected an extensive pneumocephalus originating in the area of the frontal skull base fracture A B C and extending into the cerebral cisterns and ventricles causing brain Fig. 1. Computed tomography (CT) scan obtained at admission in a 45-year-old man with a basal skull fracture and pneumothorax. A : Axial CT scan showing a punctuate focus of air around the frontal crest compression (Fig. 2A). (arrow). B : Coronal facial bone CT scan demonstrating fractures in the right orbital wall and the frontal The patient underwent an emergen- sinus (arrowheads). C : Chest CT scan revealing extensive pneumothorax and intramuscular emphysema in the left chest wall (arrowhead). cy operation because his brain was compressed by entrapped air, which made him drowsy. A small incision was made in both eyebrows, and then saline infusion was performed via two frontal burr-holes. The expected sudden gush of escaping air was not observed. The chest tube was clamped before surgery. The negative pressure was disengaged during surgery, and the tube was removed 3 days after surgery. Immediate post-operative CT scan demonstrated that some of the air had drained out (Fig. 2B). The patient recovered A with no neurologic deficits, but he remained somnolent for a couple of days. A CT scan performed 6 weeks after the surgery demonstrated that the pneumocephalus had completely resolved (Fig. 2C), and he was doing well at the 8-month follow-up examination. DISCUSSION Pneumocephalus, the presence of air within the cranial vault, results from a variety of causes. Certain conditions B are needed in order to develop this disorder, including a connection between the CNS and the external environment, air traversing through this connection, and enough air pre- sent to cause symptoms. Head trauma is the most common cause, followed by neoplasm, infection, and surgical com- plications4). Air within the brain parenchyma, termed intra- cerebral pneumocephalus, accounts for tears in both the dura and arachnoid matter. Two theories have been proposed for the mechanism C behind the development of pneumocephalus. Dandy2) Fig. 2. A : Computed tomography (CT) scans obtained 3 days after a described a “ball valve” mechanism in which air travels in diagnostic spinal tap showing extensive intraventricular, intracerebral, only one direction. As air enters the cranial cavity, the intra- subdural, and cisternal pneumocephalus causing tension in the brain. B : Post-operative CT scan demonstrating that cisterns and ventricles are filled cranial pressure rises. The pressure gradient between the with saline to a certain extent, thus relieving the intracranial pressure. C : atmosphere and intracranial space is therefore reduced, and Follow-up CT scan obtained 6 weeks after surgery showing normal ventricles and cisterns. the osteomeningeal fistula is then tamponaded by brain tissue. As a consequence, air is trapped in the intracranial fluid (CSF) in order to investigate the source of the fever. space. The other theory, the “Inverted-soda-bottle effect”, 3) The opening pressure was 20 cmH2O, and no WBCs were was proposed by Horowitz . He postulated that negative 319 J Korean Neurosurg Soc 45 | May 2009 Air Cranium Spine Epidural Space Negative Negative pressure pressure A Body Cabity B C Fig. 3. Schematic drawings showing the mechanism of extensive pneumocephalus caused by negative pressure. A : Schematic drawing of the normal status of the body. B : When negative pressure is applied, the spinal epidural space expands, and the subdural space is distended, leading to a decrease in the intracranial pressure. C : In the presence of cerebrospinal fluid (CSF) fistulae, air may be drawn into the subdural space. If spinal tapping is attempted, CSF may leak continuously, and extensive pneumocephalus may finally occur. intracranial pressure (ICP) results from excessive loss of attention should be paid when treating the pneumothorax CSF through an iatrogenic lumbar drain or settling into the with a negative pressure chest tube. If chest tube insertion is distendable spinal subarachnoid space or simply drainage essential, the negative pressure should be reduced from the via normal pathways with physiologic activity such as inspir- normally applied value, and lumbar tapping or drain inser- ation or the Valsalva maneuver. However, when there are tion must be avoided. When there is a need for lumbar fistulous connections between the intracranial and outer space, tapping or drain insertion, it should be performed after the air can enter the intracranial space in response to a negative negative pressure is disengaged. Second, although the etiol- pressure gradient. ogy of tension pneumocephalus is uncertain, a good result There have been several reports of extensive tension pneu- could be achieved with an early diagnosis and prompt treat- mocephalus caused by continuous lumbar CSF drainage. ment using burr hole trephination and saline infusion. However, the cases were all related to excessive CSF drainage for the treatment CSF fistulae. In our case, lumbar punc- CONCLUSION ture was the only performed procedure to identify the cause of the infection.

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