Penetrating aortic injury left untreated for 20 days: a case report
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Penetrating aortic trauma remains one of the most challenging injuries with a high mortality rate if left untreated, or if the surgical treatment is delayed. We present an uncommon case of a late diagnosed abdominal firearm injury, in which the bullet partially penetrated the wall of the aorta, creating a plug that prevented immediate death due to massive bleeding.
A 26-year-old Libyan man was a victim of a firearm wound, with a bullet penetrating his abdominal wall from the left to right side. After the assault, the victim, spent up to 20 days crossing the Mediterranean Sea to leave his country of origin. Abdominal radiography revealed the presence of a bullet located anteriorly to the second lumbar vertebra, while computed tomography angiography, unexpectedly, demonstrated that the bullet penetrated partially into the aortic wall at the level of the left renal artery. The bullet penetrated the aortic wall for half of its length, creating a plug that avoided immediate life-threatening bleeding at the time of the gunshot injury. The bullet was removed and the aortic lesion was repaired. The patient was discharged 6 days after the surgical procedure, in good health.
We presented a very rare case of late diagnosis of aortic injury caused by a gunshot lesion, in which the particular trajectory of the bullet helped avoid immediate life-threatening bleeding and, probably, saved the patient’s life.
KeywordsPenetrating trauma Aorta Bullet Late diagnosis Gunshot injury Firearm lesion Aortic injury
Penetrating aortic trauma remains one of the most challenging injuries; the mortality rate is as high as 87.5% for gunshot lesions , with most patients dying upon admittance to the emergency room due to uncontrolled bleeding. There are many possible clinical scenarios following a gunshot wound evaluation, such as aortocaval fistula, aortic pseudoaneurysm formation, or peripheral bullet embolization . In almost all cases, prompt surgical treatment is required to prevent an immediate death. Here, we present a very rare case involving a patient with a firearm injury to the abdomen, treated 20 days after the assault, with the bullet partially penetrating the wall of the aorta and creating a plug that prevented immediate death due to massive bleeding.
A 26-year-old Libyan man was a victim of a firearm wound while he was running seeking for refuge, with a bullet penetrating his abdominal wall from the left to right side, with an entrance orifice of approximately 3 cm in diameter at the left lumbar paravertebral region. No exit wound was seen. After the assault, the victim, a clandestine refugee from Libya, spent up to 20 days crossing the Mediterranean Sea to leave his country of origin. He was finally admitted to a recovery center in Italy and then to a local hospital, in good general condition and with no signs of hemodynamic shock.
Video 1. After clamping, the aorta was dissected and the bullet was clearly visible on the posterior surface of the aortic wall. (M4V 2928 kb)
Discussion and conclusion
The anatomic site, organs involved, and the ballistic properties of the penetrating projectiles determine the severity of the lesion after an aortic injury. If the bullet is small enough, the elasticity of the wall of the aorta may result in a spontaneous and immediate closure of the entry wound. The bullet may also embolize to distal arteries, thereby leading to critical ischemia. The incidence of this is, however, very low, with fewer than 200 cases reported [3, 4]. CT scan is the preferred method to investigate the layers of the aortic wall, although in selected case angiography and/or intravascular ultrasound could be used to eliminate scatter from the bullet for more sensitive diagnosis.
The case described herein is very uncommon, because the unusual trajectory of the bullet through the lumbar spine and finally the aortic wall resulted in a delayed diagnosis, with potentially life-threatening-complications.
The extracted bullet resembled a military rifle cartridge. Most modern military (assault) rifles launch their projectiles at 700–960 m/s and are defined as “high velocity”. The effects of rifle bullets can be far more destructive compared to handguns because of their higher energy [5, 6, 7, 8] and tendency to change their orientation (by becoming unstable and “yawing” or turning sideways relative to the line of flight) . Another important wounding mechanism besides direct tissue damage is dynamic temporary cavity formation, which becomes clinically important at impact velocities exceeding 600 m/s ; this mechanism is thus considered one of the most important features in wound ballistics of high-velocity projectiles .
Considering these characteristics, in the present patient, the bone injury was probably responsible for the retardation of the penetrating bullet , resulting in a loss of the kinetic energy and enabling the bullet to pierce the abdominal aorta and get stuck between the muscular and elastic layers of the aortic wall. The pointed shape of the nose and steel jacket of the bullet are physical properties that may also be associated with minor tissue damage, as the bullet does not deform in the tissue and has a longer distance before beginning to jaw . The high temperature of the penetrating bullet, resulting in cauterization of the adjacent tissues, may also have prevented hematoma formation and infection. Thus, despite the complicated bullet position and quite complex surgical treatment, the final result was optimal, without any postoperative complications or neurological sequelae.
In conclusion, we presented a very rare case of late diagnosis of aortic injury caused by a gunshot lesion, in which the particular trajectory of the bullet helped avoid immediate life-threatening bleeding and, probably, saved the patient’s life.
The authors would like to thank Editage for English language editing.
The authors reported no funding to disclose.
Availability of data and materials
All data generated or analysed during this study are available from the corresponding author on reasonable request.
DM, AG and GD collected the data and wrote the draft of the article; PV, GD, MV, GB and FC performed the surgical interventions; PV and MV, wrote the final version of the manuscript. All the authors read and gave the final approval to the manuscript.
Ethics approval and consent to participate
Consent for publication
The patient gave written informed consent to publish the material used for this manuscript.
The authors declare that they have no competing interests.
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