Life-threatening perforating brain injury by a rusty iron rod - A case report.

Background: When an object traverses through the cranium leaving behind both an entry and exit wound, it is called perforating brain injury. Perforating open brain injury is rare. A paucity of published literature on such cases and a lack of a standard management protocol pose significant challenges in managing such cases. Case Description: We present a case of a 24-year-old man who worked as a carpenter at the construction site. He slipped while working and fell from a height of 13 feet onto a rusty, vertically placed 3 feet iron rod located on the ground. Iron rod entered his body from the right upper chest, came out from the neck, and again re-entered through the right upper neck medial to the angle of the mandible and finally came out from the posterosuperior surface of the right side of the head. He presented to the emergency department in a conscious state, but his voice was heavy and slow-paced, and he showed signs of lower cranial nerve palsy on the right side. He underwent numerous radiological investigations. The iron rod was removed in the operation theater under strict aseptic precautions. On day 7 after surgery, he developed right lobar pneumonia, and on day 21, he developed an altered sensorium, followed by a loss of consciousness. He did not regain consciousness and, unfortunately, succumbed after 30 days of sustaining the injuries.
Conclusion: Perforating open brain injuries are rare, especially in civilian society, and are usually associated with significant morbidity and mortality. Due to a lack of standard guidelines for managing such severe injuries and limited knowledge, many patients with these injuries do not survive. Although each case presents differently, certain management principles must be followed. Copyright:

INTRODUCTION

Penetrating brain injury is a wound through which an object breaks into the skull but does not exit it. Perforating brain injury occurs when an object traverses through the skull, leaving behind an entry and exit wound. Such open brain injuries have further classified as a missile or no missile (velocity <100 m/s) based on their impact velocity.[20] Penetrating and perforating TBIs are rare compared to other TBIs causes. These injuries seen in war settings and missile objects are usually their cause.[3,4,19] These injuries are infrequent in civilian society and mainly caused by nonmissile objects. These injuries are most commonly accidental, and to a lesser extent, suicidal, or homicidal.[4,7,14,19] In comparison to penetrating injuries, perforating brain injuries in civilian society, the perforating brain is rarer. In the literature research, we have found only five cases of perforating brain injury.[1,5,9,18,22] This report presents a 24-year-old man who suffered an accidental perforating brain injury caused by a rusty iron rod at a construction site. We present the case, review the literature on the subject, and address various challenges in managing such cases.

CASE REPORT

A 24-year-old carpenter working at the construction site slipped and fell from a height of 13 feet onto a rusty vertical 3 feet iron rod, which perforated his body twice, first entering and exiting from the chest, and then from the head. Iron rod cuts with a hacksaw by his coworker at the site. He was brought to the hospital emergency department with an iron rod in situ. He was conscious, exhibited a Glasgow Coma Scale score of 15 (E4V5M6), and was well oriented to time, place, and person. His voice was heavy and slow-paced. His vital signs at the time of presentation were normal. On closer inspection, the right eye showed corneal opacity (due to an old injury), while his left pupil was normal in size and reacting well to the light. His extraocular movements were bilaterally normal. He showed signs of the lower cranial nerve palsy on the right side. His power in all four limbs was near normal.

Local examination

On local examination, a 3 feet iron rod with a thin coating of rust, approximately 1 cm in diameter, had entered the patient’s body by piercing through the skin and subcutaneous tissue of the right upper lateral chest wall just below the right clavicle and came out from the inferior half of the right side of the neck [Figure 1a]. However, iron rod re-entered his body through the right superior half of the neck, just inferior and medial to the angle of the mandible on the right side, passed through the base of the skull, and came out from the posterior surface of the right side of the head 2–3 cm lateral to the midline [Figures 1b and c]. The iron rod carried his cloth along its track in the chest to the entry point in the right superior half of the neck. As the rod was anchored to the chest wall and the head, his neck was transfixed in flexion and tilted toward the right side making intubation difficult [Figure 1d]. He also had a lacerated wound over the right shoulder due to another rod’s passage through it.

Figure 1:

The image shows an iron rod passing through the upper part of the right side of the chest (a), an iron road entering into the neck right side of the neck (b), and coming out of the right high parietal region (c). Bougie-assisted endotracheal intubation (d).

Emergency treatment

Following his presentation to the emergency department, he was started on oxygen therapy at a flow rate of 8 L/min through a face mask. He received a prophylactic tetanus toxoid injection. He was also administered intravenous phenytoin sodium, diclofenac sodium, and broad-spectrum antibiotics, including vancomycin and ceftriaxone, and mannitol. His wounds were cleaned with antiseptic solutions. He underwent an X-ray skull that revealed a metal rod in the skull [Figures 2a and b]. He was transferred to the radiology department for an immediate computed tomography (CT) scan with utmost care to avoid any further trauma.

Figure 2:

X-ray skull lateral view (a) and right oblique view (b) show metallic objects traveling through the skull. CT scan brain plain study shows a metallic artifact extending from the skull base to the high parietal region on the right side (c).

The thoracic and brain CT scan revealed the impaled metallic rod in the right upper chest, neck, and head region, along with metal streak artifacts. The rod has seen piercing through the right superolateral portion of the right pectoralis major muscle. It then passed briefly through the said muscle and exited it from its superomedial border just anterior to the right clavicle. Iron rod again pierced through the superior half of the neck on the right side in the right submandibular region lateral to the right submandibular gland and entered the skull base in the area of the right jugular foramen. The right internal carotid artery was seen below the skull base, crossing from the posteromedial aspect to the rod’s anterolateral part and appeared to have been partially indented by the rod. The rod, then, on its way up, was seen passing through the posterolateral portion of the right cerebellar hemisphere and, finally, exiting the skull through the posterior segment of the right parietal bone. A few hemorrhagic spots were noticed along the tract created by the rod [Figure 2c and Figures 3a, b]. CT angiography of the brain along with neck vessels revealed normal intracranial arteries. However, on the CT venogram, the right sigmoid sinus, right jugular bulb, and right internal jugular vein were not visualized [Figures 3c and d].

Figure 3:

CT scan head (bone window) showing metallic iron rod in behind right petrous bone (a) and a sagittal view showing its passage through tentorium (b). CT angiography of the neck showing intact left and right carotid artery and left internal jugular vein with the absence of the right jugular vein (c and d).

The patient was shifted to the operating room and the wound was explored. Securing his airway was a challenge as his neck was fixed in flexion and laterally tilted to the right side. Although mouth opening was good, negotiating laryngoscope in the mouth was not possible as the handle was getting obstructed due rod protruding out on the right side of the chest. There was absolutely no movement of the neck. There was a thick bridge of the skin and subcutaneous tissue on the rod at the neck, restricting lateral movement of the neck. With mild sedation and local anesthesia, part of the skin, subcutaneous tissue, and part of the right pectoralis major muscle cut to release the rod so that head can be manipulated. After doing so, we got the little lateral movement of the neck and we could negotiate laryngoscope and could intubate over the boogie [Figure 1d].

The patient was turned to the left lateral position to reach the entry and exit wounds. The rusty iron rod (at the right parietal area) was carefully cleaned with saline, hydrogen peroxide, and betadine solution at the exit wound for 15 min. Two separate teams of surgeons performed the surgery. The neurosurgical team made an incision around the exit wound, explored the iron rod coming out of the parietal area, and completed a small craniectomy around the rod. The dura mater opened around the rod [Figure 4a]. The general surgical team made a horizontal incision in the neck at the entry site and the wound was explored [Figure 4b]. The rod passed between the carotid artery and the internal jugular vein in the neck. After exposing both the entry and exit points, the rod gently pulled from the neck end with gentle rotatory micromovements. While removing the rod, resistance felt as the right occipital bone gripped the rod at the skull base. However, the rod was safely removed [Figure 4c]. Immediately after removal, there was no significant bleeding at either end. The wounds were irrigated with saline and antiseptic solutions for 10 min; the dural defect was closed with a pericranial patch. The injuries were closed systematically in layers. Following the rod’s removal, the vital signs were normal, and the patient shifted to the radiology department for a CT scan of the brain.

Figure 4:

The clinical photograph showing craniectomy around the exit point of an iron rod from the skull (a), explored wound around the entry point of iron rod in the neck (b), about 2.5 feet iron rod removed from the skull (c).

Postoperative CT scan

The patient’s postoperative CT scan brain revealed a linear tract of bleeding along the course of the impacted rod, which was seen extending from the right skull base, right lateral hemi-cerebellum, right tentorium cerebelli, and right parietal region. Additional findings were observed, including calvarial defects, minor right intraventricular bleed, and little right frontal extra-axial pneumocephalus. A small right subdural hematoma along the tentorial leaflet was noted. A few osseous hyperdensities were seen adjacent to the right tentorial leaflet, suggesting displaced bone fragments. The bone window revealed a minimally displaced fracture of the right occipital bone, superior to the right occipital condyle. Bone fragments were also seen in the right jugular foramen [Figure 5a].

Figure 5:

CT scan brain immediately after surgery (a) and after 4 days (b) showing hyperdense lesion along the infratentorial course of iron rod with the presence of subarachnoid hemorrhage suggestive of residual hematoma.

Postoperative sequelae

Postoperatively, the patient was ventilated and extubated after 48 h. On the 4th postoperative day, he underwent a CT scan brain plain study [Figure 5b], no new changes observed. The patient was fully conscious and well-oriented to time, place, and person [Figure 6]. He had no noticeable neurological deficits besides hoarseness of voice and right lower cranial nerve palsy. He underwent a tracheostomy procedure. He developed lobar pneumonia in the superior and middle lobes of a right lung on the 7th day after surgery, and he received higher antibiotics. His repeated CT scan brain plain study on the 10th day showed resolving changes [Figure 7a]. However, on the 21st day after surgery, he developed an altered sensorium, followed by a loss of consciousness. His brain CT scan revealed hypodensity in the deep right posterior cerebellar artery territory [Figure 7b]. However, he never regained consciousness and, unfortunately, succumbed after 30 days of sustaining the injuries.

Figure 6:

The patient after surgery.

Figure 7:

Furthermore, a small fragment of bone was noticed traversed along with the iron rod just below the tent and the right parietal craniectomy defect. CT scan brain on the 10th postoperative day showing temporal resolution of hematoma along the course of an iron rod (a) and on the 21st postoperative day showing new hypodensity in the region of the right ganglion capsular region and right parieto-occipital region suggestive of recent infarct in the right posterior cerebral artery territory (b).

DISCUSSION

As described in our case report, the incidence of perforating open brain injuries is meager compared to penetrating brain injuries. Since the first-ever report of a perforating brain injury back in 1848 by Harlow,[9] only five additional cases have been described in the literature [Table 1]. As these bizarre injuries vary in their presentations, there are no clear guidelines for managing these injuries. This discussion attempts to delineate certain principles and rules of thumb that may be followed while managing these patients.

Table 1:

The reported cases of perforating brain injury in the literature.

One should not attempt to remove the iron rod at the site (construction site in our case) where the patient suffered the injury. It is recommended to cut the perforating object (iron rod in our case) to such size that the patient can be transported easily to the hospital. Simultaneously, cutting the rod (iron rod in our case) should not create too much to and fro movements.[8] Abarca-Olivas et al. proposed using a cold saw instead of a hacksaw to cut the perforating metallic object to decrease the physical injury caused by transmitted vibrations.[1]

Once the patient arrives at the emergency department, the patient must be received a prophylactic tetanus toxoid injection along with antibiotics, anti-edema therapy, and anti-convulsive medications by intravenous route. The wound’s primary dressing should be ensured, and again, no attempt should be made to pull out the rod in the emergency room without an attached operation theater.

A good understanding of the mechanism and mode of injury is necessary for optimum patient management with perforating brain injury. Depending on the perforating metallic object’s location, a routine CT scan of the brain parenchyma and bone window study is essential. It is also recommended to perform CT angiography and CT venography to rule out significant arterial or venous injury.[16,17] These radiological evaluations provide information for preoperative planning of incision, the decision of craniotomy or craniectomy, and extraction route. The metallic perforating objects often generate metal streak artifacts that obscure critical anatomy. Therefore, dual-energy CT scanning with 3D reconstruction may be employed.[11,23] In cases where the perforating object is nonmetallic, magnetic resonance imaging plays an important role.

The fundamental goals of surgery are removing the rod/ perforating body as soon as possible, preferably within 12 h,[10,12] removing hematoma/bone fragments, performing neurovascular decompression, and achieving hemostasis and watertight dural repair. Perforating foreign bodies should be removed under direct visualization to control bleeding and retain fragments that can be removed more effectively. There is no standard procedure described in the literature for removing the rod during surgery. It is essential to thoroughly clean the perforating foreign body with antiseptic solutions for 15 min before manipulating it to minimize the brain parenchyma seeding with pathogenic microorganisms.[5] A perforating object can get firmly gripped by a bony structure (occipital bone in our case), so it is essential to release the rod at both bony ends as needed. In our case, the bony grip on the rod at the exit wound was released by craniectomy. However, at the rod’s proximal end, it was impossible to loosen the rod at the skull base (occipital bone). In such a case, one needs to pull the rod’s longer end while removing gently. Fortunately, there was no significant bleeding following the removal of the rod in our case. Blood clots and residual bone fragments are sometimes tricky to remove, and therefore, one may have to leave them inside. Intracranial pressure (ICP) is essential in perforating and penetrating brain injuries to decrease secondary injuries and maintain adequate cerebral perfusion pressure. Brain Trauma Foundation recommends mild hyperventilation, sedation, head elevation, hyperosmolar therapy, and CSF shunt to control elevated ICP. Intraoperative and postoperative use of antibiotics is necessary to prevent infectious complications and brain abscesses. Although multiple species of pathogenic microorganisms are capable of causing infection, Staphylococcus aureus must be covered by the administered antibiotics, as it is the most frequently isolated organism. It is recommended to start prophylactic broad-spectrum antibiotics such as IV vancomycin, ceftriaxone, and metronidazole for 1–6 weeks.[6,12,21]

In cases of penetrating head injuries, the incidence of vascular complications, including actual and pseudoaneurysm, arteriovenous malformation, and subarachnoid hemorrhage, has been reported to be ranging from 5% to 40%. A preoperative digital subtraction angiography study has been recommended in managing such cases.[13,15] Iron rod causes injuries to the jugular bulb and its surrounding areas are uncommon.[2] As the lower cranial nerve and major draining vein pass through the jugular foramina, they are at a very high risk of injury due to trauma around the jugular foramen. These nerves are very difficult to recover, so early tracheostomy is often recommended.[1]

CONCLUSION

Perforating open brain injuries are rare, especially in civilian society, and are usually associated with significant morbidity and mortality. Due to a lack of standard guidelines for managing such severe injuries and limited knowledge, many patients with these injuries do not survive. Although each case presents differently, certain management principles must be followed. Several factors, such as mechanism, site, size, and extent of the damage and time taken to transport the patient to the hospital, collectively determine this injury’s outcome.