Spontaneous healing and complete disappearance of a ruptured posterior inferior cerebellar artery dissecting aneurysm

Ruptured Middle Cerebral Artery Aneurysm in an Infant: Case Report and Literature Review

Intracranial aneurysms (IA) in infants are reportedly rare at 0.5% to 4.5% of all aneurysms. Furthermore, subarachnoid hemorrhage in infants younger than three months are even rarer as it has been reported in approximately 20 cases only till date. A 3-month-old infant with seizures and impaired consciousness was admitted to our hospital. Three-dimensional computed tomography angiography (3D-CTA) revealed a dissecting aneurysm with a maximum diameter of 13 mm in the right M2. Internal trapping using detachable coil were successfully performed, following which he was discharged without significant neurological deficit after one month of onset. Thus, we have reported a rare case of a large ruptured dissecting IA in a 3-month-old infant, in the right middle cerebral artery (MCA), successfully treated with an endovascular therapy, along with a literature review.

Spontaneous healing and complete disappearance of an intracranial vertebral artery dissecting aneurysm: A case report

RATIONALE

Intracranial vertebrobasilar dissecting aneurysms (VBDAs) are associated with a greater tendency to rupture and a greater risk of worse outcomes than anterior circulation aneurysms. Spontaneous healing of a VBDA is very rare, and there have been very few case reports of spontaneous healing of an aneurysm. We describe a case of intracranial vertebral artery dissecting aneurysm that healed spontaneously and disappeared completely on follow-up images.

PATIENT CONCERNS

A 40-years-old woman was referred to the neurology department because of a persistent headache, especially in the left occiput.

DIAGNOSES

Magnetic resonance angiography and computed tomography angiography showed a left vertebral artery dissection-like aneurysm (4.5 × 2.0 × 2.5 mm in size) with proximal parent artery mild stenosis (40%).

INTERVENTIONS

Flunarizine hydrochloride was administered for symptomatic treatment and follow-up angiography was performed.

OUTCOMES

Digital subtraction angiography and magnetic resonance angiography showed that the aneurysm had completely disappeared at 3 months follow-up. High-resolution magnetic resonance vessel wall imaging revealed intimal thickening and mild stenosis in the left intracranial vertebral artery without an aneurysm signal. In addition, enhancement scanning revealed that the aneurysm area was moderately enhanced. MR-vessel wall imaging at 7 months follow-up showed that the enhancement was slightly reduced compared with the previous time.

LESSONS

This case illustrates the relatively plastic nature of a vertebral dissecting aneurysm, indicating that spontaneous healing remains possible.

Cerebellar hemorrhage in a newborn: a case report in association with suspected arterial dissection of the posterior inferior cerebellar artery

We herein report a 5-day-old baby boy presented with a massive cerebellar hemorrhage due to suspected posterior inferior cerebellar artery (PICA) dissection. He was born by vacuum extraction at the gestational age of 41 weeks with 3370 g birth weight. On the fifth day of life, he developed dyspnea with worsening vital signs. CT of the head showed massive cerebellar hemorrhage and then transferred to our hospital. External ventricular drainages were emergently placed for his hydrocephalus on the first day of hospitalization, then cerebellar hematoma was evacuated with suboccipital craniotomy on day 11. Under microscopic observation, the left PICA was swollen with dark red discoloration at the caudal loop, being a confirmative finding of arterial dissection. By these findings, we suspected ruptured arterial dissection as a cause of cerebellar hemorrhage. The right PICA looked intact. He required a ventriculoperitoneal shunt on day 59 due to his persistent hydrocephalus, resulting in remarkable improvement of his neurological condition. An MRI, a CT angiography/venography, or blood tests showed no abnormalities such as tumors, vascular anomalies, or coagulopathies. We discuss the significantly rare case of cerebellar hematoma in a newborn, most likely caused by ruptured PICA dissection.

Occult posterior inferior cerebellar artery dissection requiring endovascular treatment following pediatric head trauma: case report

This is the eighth case report of a pediatric dissecting posterior inferior cerebellar artery aneurysm. The authors present the case of a 13-year-old boy who presented with posttraumatic posterior fossa subdural, subarachnoid, and intraventricular hemorrhage with hydrocephalus. Initial vascular imaging findings were negative; however, a high level of suspicion is necessary. The aneurysm was identified on day 20, after recurrence of hydrocephalus, and was treated with endovascular vessel sacrifice. The patient made a good recovery. It is important to consider arterial dissection in pediatric traumatic brain injury, especially with suspicious findings on initial CT scan and clinical presentation out of proportion to the mechanism of injury. Delayed vascular imaging is imperative for appropriate management.

Successful microsurgical treatment of intracranial aneurysms in infants: a retrospective study and literature review

OBJECTIVE

Intracranial aneurysms are extremely rare in infants, especially less than 1 year old. This study aimed to analyze the frequency of infantile intracranial aneurysm in our department and investigate the clinical characteristics, treatment strategies, and outcomes of this disease.

METHODS

Six infants under 1 year old in 4350 patients with intracranial aneurysms were retrospectively analyzed from January 2010 to December 2016.

RESULTS

The patients (5 females and 1 male) ranged in age from 2 to 11 (mean age, 4.67) months. Four patients presented with generalized seizure and vomiting, 3 showed lethargy, 1 presented eye deviation, and 1 had right-sided hemiparesis. Radiographically, two aneurysms were localized in the middle cerebral artery (MCA) of the M2 segment, two were located in the M3 segment of MCA, one was located at left MCA bifurcation, and one was located at the nonbranching site of the left supraclinoid internal carotid artery. All these lesions were successfully managed with aneurysm clipping or resection, and the improvement of neurological deficits was achieved in all patients.

CONCLUSION

Intracranial aneurysms should be considered in the differential diagnosis of infants who present with acute raised intracranial pressure. An improvement of neurological deficits is noted in infants who are managed promptly with microsurgical techniques of clipping during the long-term follow-up.

Pediatric Intracranial Aneurysms: Considerations and Recommendations for Follow-Up Imaging

BACKGROUND

Pediatric intracranial aneurysms (IAs) are rare. Compared with adult IAs, they are more commonly giant, fusiform, or dissecting. Treatment often proves more complex, and recurrence rate and de novo aneurysmogenesis incidence are higher. A consensus regarding the most appropriate algorithm for following pediatric IAs is lacking.

METHODS

We sought to generate recommendations based on the reported experience in the literature with pediatric IAs through a thorough review of the PubMed database, discussion with experienced neurointerventionalists, and our own experience.

RESULTS

Digital subtraction angiography (DSA) was utilized immediately post-operatively for microsurgically-clipped and endovascularly-treated IAs, at 6-12 months postoperatively for endovascularly-treated IAs, and in cases of aneurysmal recurrence or de novo aneurysmogenesis discovered by non-invasive imaging modalities. Computed tomographic angiography was the preferred imaging modality for long-term follow-up of microsurgically clipped IAs. Magnetic resonance angiography (MRA) was the preferred modality for following IAs that were untreated, endovascularly-treated, or microsurgically-treated in a manner other than clipping.

CONCLUSIONS

We propose incidental untreated IAs to be followed by magnetic resonance angiography without contrast enhancement. Follow-up modality and interval for treated pediatric IAs is determined by initial aneurysmal complexity, treatment modality, and degree of posttreatment obliteration. Recurrence or de novo aneurysmogenesis requiring treatment should be followed by digital subtraction angiography and appropriate retreatment. Computed tomography angiography is preferred for clipped IAs, whereas contrast-enhanced magnetic resonance angiography is preferred for lesions treated endovascularly with coil embolization and lesions treated microsurgically in a manner other than clipping.