A new standardized nomenclature in neurosurgery: Criteria and quantitative and qualitative evaluation indicators of medical procedures.

Purpose: Update the list of medical acts in the specialty of Neurosurgery, eliminating obsolete acts and adding the new surgical techniques developed in recent years, so that they are faithfully adapted to the usual medical practice of our specialty, as well as establishing the general principles and defining the grading criteria, quantitative indicators and assessment scales.

Methods: The elaboration of the new nomenclator was divided into 3 phases: 1) identification and selection of medical acts, 2) establishment of the degree of difficulty of each of them based on the experience and the time necessary for their completion, as well as the percentage and severity of the possible complications and 3) consensus with the members of the SENEC through their individualized submission, making the necessary adjustments and subsequent approval in the general assembly of SENEC.

Results: The new nomenclator has 255 medical acts grouped into 4 groups: consultations and visits, therapeutic acts, diagnostic procedures and surgical interventions.

Extradural minipterional approach: Evolving indications of the minipterional craniotomy.

Background: In this paper, we report a clinical series of skull base lesions operated on trough the MiniPT, extending its application to skull base lesions, either using the classical minipterional or a variant, we call extradural minipterional approach (MiniPTEx).

Methods: We describe our surgical technique of operating on complex skull base lesions using a minipterional extradural approach. Anterior clinoidectomy, middle fossa peeling, transcavernous, and Kawase approaches were performed as needed.

Low-grade malignant triton tumor in the lumbar spine: a rare variant of malignant peripheral nerve sheath tumor with rhabdomyoblastic differentiation.

Malignant peripheral nerve sheath tumor (MPNST) is an uncommon type of sarcoma that arises from peripheral nerve sheaths and rarely involves the spinal roots. The origin of this tumor is thought to be Schwann cells or pluripotent cells of the neural crest. The subgroup of tumors in which malignant Schwann cells coexist with malignant rhabdomyoblasts is termed malignant triton tumor (MTT).

Endovascular treatment of a vertebral artery pseudoaneurysm following posterior C1-C2 transarticular screw fixation.

We present a case of vertebral artery pseudoaneurysm after a posterior C1-C2 transarticular screw fixation procedure that was effectively treated with endovascular coil occlusion. Vertebral artery pseudoaneurysm complicating posterior C1-C2 transarticular fixation is extremely rare, with only one previous case having been reported previously. Endovascular occlusion is better achieved in the subacute phase of the pseudoaneurysm, when the wall of the pseudoaneurysm has matured and stabilized.