According to the literature, the majority of deep penetrating abdominal and spine injuries are provoked by objects made of metal and wood. The most widely reported cause of penetrating injury to spine is gunshot injury , with few reports of such injuries involving knifelike objects  and glass ; only two cases of penetrating injury by wooden fragments into the lumbar spinal canal with  and without cauda equina syndrome have been described . Abdominal penetrating trauma is mainly caused by low or high velocity projectiles . Injuries of the abdomen and the spinal canal that involve organic material of animal origin are extremely rare and derive from domestic or wild animal attacks (wild boar's gore , cow's gore , bull's horn , zebu's gore ), as well as fish attacks (stingray , garfish , sturgeon  and swordfish [1–4]) according to the literature. To our knowledge, there are only three reports of a swordfish attack on human in the literature that resulted in presence of biological material of such origin in the human body - one in craniofacial structures , one in the thorax , and one in knee . However, we have to point out that our case is unique due to the reasons below:
- It is the first case of unprovoked attack of swordfish on humans. The three first victims were professional or amateur fishermen whereas in the last reported case the victim was a bather as in our case. However, the bather provoked the swordfish to attack him by mistakenly identifying it to be a shark threatening his child. On the contrary, our patient did not provoke the swordfish in any way since she was swimming carefree and she did not even realise the fish presence until its attack.
- It is the first case of deep abdominal penetrating trauma caused by swordfish attack
- It is the first case of penetrating injury to the spinal canal by bony fragments of this nature- in the case with the penetrating thoracic wound the tip of the sword was adhered to the body of third thoracic vertebra (T3), but there was no bony debris in the spinal canal.
The salient feature of the swordfish is the prolongation of its upper jaw into a long, flat, sword-like bill occupying nearly one-third the total length of the fish . Swordfish, except young fry, are both toothless and scaleless and usually grow to a great size; its common length is 300 cm with maximum cited length 455 cm [18, 19]. Maximum published weight is 650 kg . Swordfish is oceanic, not dependent in any way either on the coast, except as this offers a supply of food, or on the bottom; and it is a warm-water fish . They are always seen swimming alone or at most two fishes together. They eat once a day, mainly at night when they rise to surface and near-surface waters surging smaller fishes. They have often been described as rising through schools of fishes, thrashing their swords to harm or kill, and then turning to consume the dead or mangled fish [18, 21]. Till now, there were no reports of unprovoked swordfish attack to human. However, there are many reports of swordfish attacks to fishermen and their vessels after the former had been harpooned .
Trauma is the leading cause of death and disability during the most productive years of life (25-40) . The liver is the first most commonly injured intra-abdominal organ and is found to be damaged in 30% of patients undergoing laparotomy for penetrating abdominal trauma. The outcome after liver trauma has been shown to be dependent on the severity of the liver injury, the mechanism, and presence of any other associated injuries with a commonly quoted overall mortality of around 12% .
The primary goal in the treatment of severe abdominal liver injuries is to preserve life. Management, which has evolved significantly over the last three decades and is based on well defined protocols, is divided into four sequential phases: resuscitation, evaluation, initial management, and definitive treatment. In this case initial resuscitation performed in Medical Center of Santorini Island. The patient received intravenous fluids and broad-spectrum antibiotic therapy which was continued in our hospital.
The key underlying determinant of subsequent management is hemodynamic stability. In cases of abdominal injuries, where hemodynamic stability is maintained with or without volume resuscitation prompt radiological imaging should be performed. Our patient, as mentioned above, underwent X-rays and FAST at island's Medical Center and CT in our hospital.
After initial resuscitation and investigation the question that arises is whether the patient should be managed operatively or non-operatively. Those patients who remain in shock after vigorous intravenous fluid resuscitation usually have continued bleeding and require urgent laparotomy. Surgery should not be delayed to obtain the results of special examinations. Along with haemodynamic instability other major indications for urgent laparotomy are stab or gunshot wounds that have penetrated the abdomen, signs of peritonitis, unexplained shock, evisceration, uncontrolled haemorrhage, clinical deterioration during observation . In our case patient underwent surgical management due to her clinical deterioration during observation and to her presentation with signs of peritonitis three hours after her injury, despite the fact that was hemodynamically stable.
Follow-up scans within 2 to 5 days can determine changes in the injury's appearance. It has been found that 49% of follow-up scans after operative management of severe liver injuries demonstrate new liver related complications, most of which require intervention . Our patient underwent follow-up scans the fourth, tenth, twenty fourth and thirty first postoperative day.
Late complications of liver injury can occur following non-operative and operative management and include secondary bleeding, usually from pseudoaneurysms, infected collections and bile leaks. The majority of these complications can be dealt with by radiological intervention, with percutaneous drainage of collections, localization and temporary stenting of bile leaks by ERCP and angiographic embolization of secondary haemorrhages . The percutaneous drainage of biloma with CT-guidance resulted in our patient's non operative treatment. ERCP (with sphincterotomy or bile duct stenting) was not performed in this patient due to the relevant morbidity of this procedure (acute pancreatitis, gastointestinal bleeding). A non-invasive alternative, MRCP, was performed instead; it did not indicate bile leak or other pathology, and further treatment was regarded unnecessary.
The most prevalent cause of morbidity and mortality, after the acute phase of penetrating injury, is infection. Penetrating abdominal trauma carries a high risk of serious infection because of immunosuppression from hemorrhage, transfusion and the high likelihood of intestinal injury. Presumptive antibiotic therapy should be initiated as soon as possible and should be continued for 24 hours. Prolonged courses of antibiotics offer no advantages over a 24-hour regimen . As far as our patient is concerned, she received intravenous antibiotic therapy for a prolonged period due to the spinal canal inflammation.
In penetrating spinal trauma, X-rays, CT-scan  and MRI-scan  (when available and there is no metallic material) should be performed whereas Magnetic Resonance Angiography (MRA) is essential in specific injuries . Our patient underwent X-rays of the vertebral column and MRI of the lumbar region after her initial resuscitation. The imagery did not indicate any cord change and our patient was considered to have good prognosis. However, the organic foreign debris in the spinal canal caused inflammation of lumbar vertebra and arachnoid membrane. This was confirmed on MRI of lumbar region on tenth postoperative day. Neurosurgeons removed it through laminectomy.
Current treatment of penetrating injury to the spine has been studied for gunshot wounds and for other penetrating trauma, such as stab wounds, with little difference in treatment goals. With any penetrating injury, treatment considerations include the neurological status of the patient, the stability of the spine related to the degree of bony and ligamentous injury, the path taken by the projectile or blunt object, the amount of canal compromise, and the location of retained fragments . The nature and structure of the object, is also of great importance. A living organic body part, as the epithelium of swordfish bill, is loaded with bacteria and therefore is putrescible under all circumstances. Its removal is crucial and is strongly recommended, as learnt from that case. Prophylactic intravenous broad-spectrum antibiotic therapy has been used in the majority of patients' treatment of this type of trauma [1, 3] - even with negative bacteriological results, as in our patient. According to literature, intravenous wide spectrum antibiotic therapy must be implemented to such patients for up to six weeks, to achieve an acceptable rate of cure. As a cost reduction exercise for patient, parenteral antibiotic administration on an outpatient basis or the use of oral antibiotics can be considered . Our patient received intravenous antibiotic therapy for five weeks and left the hospital with the advice to continue her medication per os for three more weeks. Noticeably, use of steroid in penetrating injury to the spine has not demonstrated any benefit . Our patient was not given any steroids.
Surgery in penetrating injury to the vertebral column is indicated for progressive neurological deficits, persistent cerebrospinal fluid leak or in the absence of neurological symptoms with radiological evidence of compression . Although initial retrospective reports showed no benefits of surgical treatment compared with conservative management of penetrating spinal injuries , later data show that early extraction may reduce the incidence of infection, myelopathy and delayed neurologic loss . However, the timing of surgical intervention in spinal injuries remains a subject of controversy. In the literature, both early and delayed surgical treatment of penetrating injuries to the spine with a remnant foreign body resulted to patients' neurological improvement [7, 37, 38]. Yet, we do not know to what extent the timing of surgical treatment was related to the neurological improvement. Moreover, we have to point out that management of a retained foreign body in a spinal penetrating injury even if desirable is often challenging, because removal of the object may cause neurological sequela. The reason mentioned above combined with the lack of experience in such patients treatment in our hospital was the main cause that made orthopaedics and neurosurgeons hesitant as far as foreign body's removal, from the posterior approach. The patient was a young woman lacking neurological deficits, after her spinal penetrating injury, therefore conservative management regarded appropriate. The subsequent inflammation of the spinal canal though, left the specialist with no other choice but the invasive one. The operation (laminectomy) was successful and the patient's clinical condition and radiological imaging improved rapidly.