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Gadolinium diethylenetriamine penta-acetic acid (Gd-DTPA) is the main contrast agent used in MRI, known for its good tolerance and rare toxicity. Even intrathecal injection of limited doses of Gadolinium can be performed in some indications. To our knowledge, only 3cases of accidental intraventricular injection of Gadolinium have been yet reported in the literature. We report the case of a 40-year-old male patient, who presented with headaches and vomiting. Brain MRI showed a right parietal abscess. The patient underwent emergent surgery for drainage of the septic collection. Postoperative MRI showed the development of a hydrocephalus related to a ventriculitis. Another surgery was performed to set up an external ventricular shunt, which lead to an improvement of the neurological status. A control brain MRI was scheduled for the patient, which revealed extensive abnormal enhancement inside the right lateral ventricle, on the basal cisterns as well as a leptomeningeal enhancement. Shortly after Gadolinium injection, the patient presented a tonic-clonic seizure. This clinico-radiological context leads to discover of the inadvertent intraventricular administration. Afterward, the patient's condition quickly deteriorated. Two days after the MRI he presented a cardiorespiratory arrest followed by death. Direct administration of Gadolinium into a ventriculostomy mistaken for intravenous catheter is a rare but harmful situation. Despite their rarity, such cases prove the importance of tracing all lines to their insertion sites to be confident of their appropriateness for injection.

Highlights • Strokes are rare in paediatric population. • Posttraumatic strokes in children may be the result of several linked factors. • Postoperative strokes may occur even several days after surgery thus the need for extended follow up. • Based on trauma mechanism and consequences, children presenting stroke risk should be early identified., Introduction Traumatic brain injury (TBI) is the leading cause of morbidity and mortality in children. TBI in children are responsible for a range of clinical symptoms and signs that are comparable to those in adults, but present several differences in both physiopathology and management. Many postoperative complications may occur, ischemic stroke among others, which is generally related to an injury of an intracranial artery. Out of this case, it may be more difficult to find a suitable explanation to this complication. Case presentation We report the case of a child aged years old, who was collided by a car causing a polytrauma with head and chest injury. On body scan, she had a fracture of the sixth left rib, and a frontal cranio-cerebral wound. The patient was operated for debridement of the wound, and tight closure of the injured dura mater. Initial postoperative course was uneventful, but 5 days after first surgery patient presented an acute onset of a right hemiplegia followed by an alteration of her state of consciousness, and a left anisocoria. Follow up CT scan showed a stroke of the whole left carotid territory. The patient was re-operated through a left decompressive craniectomy. Following the second surgery, she showed an improvement of her level of consciousness and a normalization of the size of her pupils, but aphasia and a right hemiplegia persisted. 2 weeks after surgery, the patient had a progressive necrosis of the surgical scar, followed by an exposure of the underlying cerebral cortex. Despite of intensive local care, a plastic surgery to recover the wound and antibiotics, the patient presented a meningitis, followed by a septic shock and death. Clinical discussion and conclusions Ischemic stroke is probably the most harsh and unpredictable complication that may occur after TBI, mainly in children. Only rigorous surgical approach followed by stringent post-operative care may prevent such outcomes.

Lumbar pigmented villonodular synovitis is rarely localized on the lumbar spine. Awareness of pigmented villonodular synovitis is important despite its rarity because it may mimic several other lesions of this location.

Pilomyxoid astrocytomas (PMA) is a particular form of glial tumors distinct from pilocytic astrocytomas (PA). On the last 2016 WHO classification for CNS tumours, no definite grade assignment was proposed for these lesions. They may be more aggressive with a different clinical course compared to PA due to their greater propensity for local recurrence and cerebrospinal dissemination. Most cases arise from the hypothalamic region. Only few studies reported cerebellar localization of the lesion. We report 3 pediatric cases treated for pediatric PMA of the posterior fossa. Clinical, radiological, and prognostic features were reviewed. The age of our patients was between 1 and 9 years old. Signs of intracranial hypertension were found in all patients. One of them presented an increased head circumference and the 2 others had a cerebellar syndrome. Brain CT-scan and MRI displayed a large wellcircumscribed intra-axial solid and cystic posterior fossa tumor. Total surgical resection was performed for all tumors. After a 2 years follow up, no signs of recurrence were noticed. In the literature, PMA been reported with overwhelming majority in children aged between 2 months and 4 years. Despite of many pathological similarities with PAs, PMAs have some specific features in histology, leading to their identification as independent type of glioma. Radiological differential diagnosis between PMAs and Pas can be made using arterial spin labeling imaging, which shows low perfusion parameters in PAs. Clinical and radiological follow up are mandatory do to different natural history and higher rates of local recurrence of this tumor compared to PA. Prognosis is favorable when complete surgical exeresis is possible.

Background Epidermoid cysts (ECs) account for 0.5% to 1% of all spinal tumors. They can be congenital or acquired. Acquired spinal ECs are extremely rare and are mostly caused by trauma, or secondary to iatrogenic procedure such as lumbar punctures or surgery for spina bifida. As far as we know, this is the first report of a spinal EC complicating surgery for a lumbar disc herniation. Case Description A 69-year-old woman, with a history of L3–L4 lumbar disc herniation surgery 30 years earlier, presented because of low back pain, weakness of her lower limbs, and bladder dysfunction evolving for 2 years. Magnetic resonance imaging identified an intradural cystic lesion extending from the medullary cone to the L4 level, evoking an EC. The diagnosis was confirmed peroperatively. Neurologic motor signs improved postoperatively but not the sphincter disorders. Conclusions Despite the extreme rarity of this event, we should be aware of the potential de novo development of epidermoid tumors in patients who undergo surgery for lumbar disc herniation. Concerns must be given to persistent low back pain and delayed neurologic symptoms in these patients.

Introduction and importance Hereditary multiple exostoses (HME) is a benign disease, usually encountered in the metaphysis of long bones. On the opposite, spinal localizations are very rare. We herein describe a case of HME with a spinal cord compression. Case presentation A 31-years-old patient with a history of HME, presented with signs of cervical spinal cord compression that progressively appeared in the last 10 years. Cervical MRI and CT scan showed a compressive osseous tumor arising from the surface of the right side of the dorsal arch of the axis. Our patient underwent C1C2 laminectomy, but no clinical improvement has been recorded postoperatively. Clinical discussion Spinal cord compression is an extremely serious complication of hereditary multiple exostoses (HME). The cervical and thoracic areas were predominantly affected, with the symptoms usually developing slowly. Early surgery is correlated to good postoperative outcomes. Conclusion Despite its rarity, HME should be considered as a possible cause for spinal cord compression., Highlights • Hereditary multiple exostoses (HME) is a rare benign dominant autosomal skeletal disease. • Upper cervical spine cord compression is a rare complication of HME. • Clinical and radiological screening of spinal compression for patients with osteochondromas can lead to good prognosis. • Early spinal decompression is the key to good results.

Highlights • Brain metastases are rare forms of manifestations of gastro-intestinal stromal tumors. • Brain metastases of gastro-intestinal stromal tumors are usually supra-tentorial. Infra-tentorial localizations are very rare. • The treatment is based on surgery and radiotherapy. Chemotherapy has only limited interest., Introduction Intracranial metastases of gastro intestinal tumors are very rare. To the best of our knowledge only few cases were reported on the literature. Case description We describe the case of 66-year-old male that presented with headache and vomiting. Physical examination found a kinetic cerebellar syndrome. Brain CT scan and MRI showed a right cerebellar tumor. Sub-occipital craniotomy was performed and the tumor was completely resected. Surgical outcomes were marked by the occurrence of an abdominal pain two days after brain surgery. Peritonitis was diagnosed and the patient underwent surgery. Per-operatively, a hemorrhagic tumor perforating the intestines was found and resected. Pathologic examination of the cerebral tumor's resection piece and the intestinal resection piece concluded to a metastasis of a stromal gastro-intestinal tumor. Discussion Gastro-intestinal stromal tumors are frequent neoplasms, but intracranial metastases of these neoplasms are extremely rare. Abdominal symptomatology frequently reveals the pathology. However, extra digestive symptoms may in rare cases disclose intestinal tumors. Intracranial metastases of gastro-intestinal stromal tumors are generally solitary mainly supratentorial. Infratentorial metastases are very uncommon. Management of gastro-intestinal stromal tumors is based on surgical removal of the tumor. Adjuvant treatment consisting on chemotherapy and radiotherapy is subject of debate. Conclusions Gastro-intestinal stromal tumors are frequent neoplasms with a high metastasizing potential on liver and peritoneum. Brain metastases are extremely rare and the prognosis is worse when they are present. Surgery remains the main treatment for the primitive and the secondary lesions.

Context: We report the case of a 40-year-old woman with no pathological history, operated from an L4-L5 disc herniation by a left unilateral approach. The dura mater enveloping the left L5 root was accidentally injured at its lateral face causing a breach with CSF leakage. This breach could not be sutured. A few hours after waking, the patient presented an agitation followed by three generalized tonico-clonic seizures. Cerebral imaging revealed pneumocephalus. The patient was hospitalized in an intensive care unit. The symptoms gradually faded and the patient was discharged 3 days after surgery. Findings: Pneumocephalus is defined by the presence of air inside the skull. The symptoms of pneumocephalus are generally non-specific and varied, and this complication should also be kept in mind to prevent potentially severe course. The prevention of postoperative pneumocephalus depends on a well-defined strategy in the case of iatrogenic dural tear. Conclusions: Symptomatic pneumocephalus is a very rare complication in the course of lumbar surgery. Conservative therapy may be appropriate even in severe symptomatic manifestations.

Ganglioneuromas are rare benign tumours of neurogenic origin that most frequently develop in the cervical sympathetic chain,1 2 with genetic associations demonstrated with Neurofibromatosis type 1 (NF-1). We report the case of a 41-year-old woman with a history of cavum neoplasm at the age of 23. This tumour was classified after assessment of extension as T1N0M0 (tumour, node, metastases). Pathological examination of a biopsy concluded to a keratinising squamous cell carcinoma. The patient was then irradiated (2D Cobalt radiotherapy). The patient presented with gait trouble that appeared a few weeks ago. Clinical examination found a Brown-S e quard syndrome with paresis …

Highlights • Skull metastases are rare forms of manifestations of renal tumors. • Any unusual lesion of the skull should be thoroughly evaluated whether the patient has a prior history of cancer or not. • Treatment of metastatic renal cell carcinoma is complex, and the optimal regimen for achieving a lasting response without severe toxicity has not yet been defined., Background Renal cell carcinomas represent 85% of malignant renal tumors. Typically, the tumor remains asymptomatic a long time before the appearance of urologic clinical signs. In some cases, metastasis can precede the manifestations of the primary tumor. Different sites are potential metastatic localizations for renal tumors, including skull metastases who represent a very rare location. Case description We report the case of a 65-year-old man presented after the appearance of a skull mass. This tumefaction developed and had progressively grown up during 9 months. Neurological examination was normal. Brain imaging showed a soft tissue lesion in the left parietal bone with marked osteolysis. Peroperative was found a huge oval-shape hemorrhagic and firm mass associated with scalp invasion and bone destruction that was totally resected. Histopathology revealed renal cell carcinoma (RCC). Pelvic and abdominal CT scan was performed, revealing a large mass on the left kidney with irregular contours and poor definition. The patient was then transferred to urology where he underwent nephrectomy. The patient went then through adjuvant chemotherapy. Clinical and radiological follow up of 12 months did not bring to light tumor recurrence. Conclusions Although metastases to the head and neck occur infrequently, they should be considered when evaluating any unusual subcutaneous mass in the head and neck. RCC should not be discounted when sites as unlikely as the calvaria are evaluated. Treatment of metastatic renal cell carcinoma is complex, and the optimal regimen for achieving a lasting response without severe toxicity has not yet been defined.

Ventriculoperitoneal (VP) shunt surgery is the most widely used technique for the treatment of hydrocephalus. However, it can incur certain complications. Beside frequent complications (infection, obstruction), migration of the peritoneal catheter is a rare but dangerous complication. This report presents the case of a 4-year-old boy who had undergone VP shunt for hydrocephalus. One month later, the patient presented with protrusion of the peritoneal catheter through his mouth. He underwent another procedure to remove the peritoneal catheter, retaining the original ventricular catheter and valve chamber. Progression was favorable. To the best of our knowledge, only 7 cases of VP shunt transoral extrusion were reported, but many risk factors were identified. Bowel perforation is a serious complication of VP shunt surgery, sometimes leading to fatal outcome.

Background Intracranial dermoid cysts are uncommon lesions with characteristic imaging appearances. Symptomatic clinical presentation usually occurs in one of two ways: mass effect or rupture. Radiologically, dermoid cysts typically present as low density masses on computed tomography (CT) scan and are generally hyperintense on T1-weighted magnetic resonance imaging (MRI) sequences with variable signal on T2-weighted sequences. Case description We present the case of a 35-year-old female presented with symptoms of increased intracranial pressure. Radiological investigations showed a cystic posterior fossa tumor that was not only hyperdense on CT scans but also hypointense on MRI T1-weighted images. The patient underwent a total-gross resection of an extra-parenchymal posterior fossa tumor. Pathologic examination of the specimen concluded to dermoid cyst. Conclusion Dermoid cyst of the posterior fossa is a benign lesion surgically treatable. Only an appropriate radiological diagnosis of this lesion would permit a well-targeted therapeutic approach.

Background: Syringomyelia is commonly associated with Chiari malformations, spinal trauma, arachnoiditis, or tumors. However, rarely, cervical canal stenosis is implicated in intramedullary cavitations. Case Discription: Here, we report the case of a 60-year-old male patient who presented with loss of pain and temperature sensation in upper extremities associated with a spastic tetraparesis. On magnetic resonance imaging, the patient was found to have syringomyelia extending from C1 to Th3. Following posterior decompressive surgery, the syrinx resolved along with the patient's neurological complaints. Conclusion: Here, the authors presented a case and reviewed the literature regarding how cervical spinal stenosis may contribute to cervical or thoracic syringomyelia.