A Side Door to Meckel's Cave: Anatomic Feasibility Study for the Lateral Transorbital Approach.

Background: In the last decade, endoscopic skull base surgery has significantly developed and generated a plethora of techniques and approaches for access to the cranial ventral floor. However, the exploration for the least-aggressive, maximally efficient approach continues.

Objective: To describe in detail an anatomical study, along with the technical nuances of a novel endoscopic approach to Meckel's Cave (MC) using a lateral transorbital (LTO) route.

Pituitary macroadenoma: analysis of intercarotid artery distance compared to controls.

Objective To evaluate the intercarotid distance (ICD) of patients with pituitary macroadenoma and compare to heatlhy controls. Method We retrospectively reviewed contrast-enhanced MRI images from twenty consecutive patients diagnosed with non-functioning pituitary macroadenoma, measured the ICD at two different levels (petrous segment - ICD1 and horizontal cavernous segment - ICD2) and compared to twenty paired controls. Results There was no statistically significant difference of the mean ICD1 between the groups and subgroups.

Morphometric analysis of the medial opticocarotid recess and its anatomical relations relevant to the transsphenoidal endoscopic endonasal approaches.

Background: The medial opticocarotid recess (MOCR) is located in the posterior wall of the sphenoid sinus, medial to the junction of the optic canal (OC) and the carotid prominence (CP). There is controversy in the literature in relation to the presence of the MOCR and its constancy, which is relevant when approaching the skull base through an endoscopic route.

Methods: The morphometric relations of the MOCR with the surrounding structures were studied in 18 cadaveric specimens after endoscopic endonasal approach (EEA).

Predicting the presigmoid retrolabyrinthine space using a sigmoid sinus tomography classification: A cadaveric study.

Background: The presigmoid retrolabyrinthine space is characterized by a widely variable size. The main structure involved in this large variability is the sigmoid sinus. Few studies have attempted to establish a reliable classification of sigmoid sinus to predict the presigmoid retrolabyrinthine space.

Tension pneumoventricle after resection of a fourth ventricle choroid plexus papilloma: An unusual postoperative complication.

Background: Pneumocephalus is defined as the presence of air within the intracranial vault. A common complication of head trauma and surgery, pneumocephalus is usually related to ventricular shunts, craniotomies, and surgery in the sitting position. Tension (symptomatic) pneumoventricle is a rare entity associated with significant clinical morbidity.

Peripheral primitive neuroectodermal tumor of the cervical spine.

Background: Primitive neuroectodermal tumor (PNET) is a malignant neoplasm that generally arises from bone and soft tissues, with predilection for young adults. This neural crest origin tumors share biologic and histologic features with Ewing's sarcoma (ES).

Case Description: We present a case of a 22-year-old woman with history of severe progressive neck pain, without radiation, associated with paresthesia in the right arm, and palpable right posterior cervical mass.