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Chiari Malformation type 1 (CM-I) is congenital or an acquired anomaly of the hind brain; develops when the cerebellar tonsils recede downwards below the foramen magnum. Recurrent post tussive suboccipital headache is the common presentation in a pregnant woman and the diagnosis is usually missed or delayed due to lack of formal understanding of this neurological pathology. Much has been written regarding presentation, morphology and the treatment of CM-I; however, little is known when the etiology is acquired or an iatrogenic in its evolution. Similarly, unknown is the progression of CM-I (diagnosed or undiagnosed) in pregnancy. The objective of this study is to elucidate the causes of progression of CM-I in pregnancy, and how this can be avoided. A detailed literature review has been conducted to find the case reports or case studies on association of CM-I in pregnancy; therefore, the risk factors regarding the progression have been sought. There is a lack of literature on timing, mode of anesthesia, and the management of CM-I. Moreover, authors have sought a questionnaire to screen these patients at pre-conception, intrapartum visits if, the initial diagnosis is delayed. Crucial points of concern including but not limited to the diagnosis, pre-conception counseling, timing of intervention during pregnancy, and mode of anesthesia, have been discussed in detail. In summary, a formal management algorithm has been proposed to avoid the rapid progression of this complex neurological pathology especially, in women of child bearing age and/or during pregnancy., (Copyright © 2020 Elsevier Ltd. All rights reserved.)

Occipital neuralgia typically arises in the setting of nerve compression by fibrosis, surrounding anatomic structures, or osseous pathology, such as bone spurs or hypertrophic atlanto-epistropic ligament. It generally presents as paroxysmal bouts of sharp pain in the sensory distribution of the first three occipital nerves. Due to the long course of the greater occipital nerve (GON), and its peculiar anatomy, and location in a mobile region of the neck, it is unsurprising that the GON is at high risk for compression. Little is known how to diagnose or treat this neuropathic pain syndrome. The objective of this paper is to isolate the etiology involved, and treat this condition promptly. After all nonoperative efforts are exhausted, surgical transection of the nerve is the treatment of choice in these cases. An isolated C2 neurectomy or ganglionectomy is performed for an optimal pain relief. C1-2 instrumented fusion can be considered if, extensive facet arthropathy with instability is identified. Authors review the spectrum of treatment options for this debilitating condition, and discuss the case example of a patient who required conversion to a C1-C2 instrumented fusion following C2 ganglionectomy due to an underlying extensive degenerative disease and intraoperative findings suggestive of atlantoaxial instability., (Copyright © 2019 Elsevier Ltd. All rights reserved.)

Colloid cyst are cystic lesions in the third ventricle and could render patients asymptomatic. However, there is an inherent risk of symptomatic progression, acute decompensation, and sudden death. Therefore, there is no clear consensus as how to observe or when to treat a newly diagnosed patient with a colloid cyst. The authors' objective is to identify the risk factors and then develop a risk stratification score to guide neurosurgeons during acute or chronic presentation. Radiological imaging characteristics have been outlined for the risk stratification as well preoperative evaluation. A baseline neuropsychological evaluation is helpful to obtain during an incidental presentation because history and neurological examination could be inconclusive in these cases. Radiological imaging with an MRI brain scan plays a vital role for the initial screening (determination of the cyst size, exact location, and the imaging characteristics) as well as for the preoperative planning. Stereotactic guidance is a high yield, followed by neuroendoscopic resection of the colloid cyst has been an established approach to resect these lesions. Modified colloid cyst risk scoring (mCCRS) system is robust and detailed for the optimal risk stratification of colloid cyst presentation. Stereotactic guided neuroendoscopic resection of the colloid cyst is a safe and efficacious approach to manage these lesions. The intended use, crucial steps involved, and the limitations of the technique have been discussed especially with a focus on the recurrence. Moreover, a comprehensive treatment algorithm has been presented., (Copyright © 2019 Elsevier Ltd. All rights reserved.)

Basilar artery apex or bifurcation is the most common location for aneurysms arising from posterior cerebral circulation. Reports of unruptured aneurysms of the basilar bifurcation associated with ruptured anterior circulation aneurysms are rare. The presence of multiple intracranial aneurysms poses a significantly high risk to management than a single aneurysm due several factors involved. Surgical management is considered the best treatment modality for most aneurysmal types and location with quite a few limitations when applicable. Authors have conducted a literature review of anterior and posterior circulation concomitant aneurysms and report their own experience with a case of anterior communicating artery blister type aneurysmal rupture presented with the symptoms and signs of subarachnoid hemorrhage concomitant with an unruptured basilar artery bifurcation aneurysm. Moreover, the anomalous origin of thalamoperforators at the basilar apex instead of the posterior cerebral artery makes it reasonably challenging for the microsurgical clipping. Discussed is the clinical presentation, radiological studies obtained, surgical approach utilized with an adequate exposure of the entire circle of Willis as well as the critical decision making when managing these challenging cases., (Copyright © 2019 Elsevier Ltd. All rights reserved.)