The Geometry of the Circle of Willis Anatomical Variants as a Potential Cerebrovascular Risk Factor.

Aim: To correlate the anatomical variants of the circle of Willis with their effects on the hemodynamic and geometrical parameters responsible for the pathogenesis of neurological diseases.

Material And Methods: The circle of Willis and the proximal segments of the main arteries were dissected and measured on ten formalin-fixed human brains. The anatomical variants were systematized using descriptive statistics.

Morphometric study of the human brainstem and its neurovascular relations.

Aim: The brainstem is a very complex segment of the central nervous system because it has a high density of nuclei and tracts with vital functional roles. This explains the considerable difficulty of surgery for lesions located in or around the brainstem. Our paper aims to provide a concise description of the external configuration, its internal correspondence and the neurovascular relations of the brainstem with morphometric data that can be useful in surgical planning.

Keratoacanthoma of the conjunctiva - case report and review of the literature.

Introduction: Keratoacanthoma (KA) is a relatively common, benign, rapidly growing and self-limiting squamous proliferation, which appears most frequently on the sun-exposed skin. The nature of KA and its relationship to squamous cell carcinoma (SCC) still represent one of the major debates in dermatopathology, as it is the truthfulness of such a diagnosis outside the skin. However, the tumor is now known to originate from the pilosebaceous units of the skin or from ectopic sebaceous glands of squamous mucous membranes, and to differentiate onto follicular isthmus÷infundibulum-like epithelium.

Solitary Langerhans histiocytosis of the orbit: case report and review of the literature.

Langerhans cell histiocytosis (LCH), previously known as "histiocytosis X", is a clinical entity characterized by abnormal proliferation of Langerhans cells, which exert a mass effect. Orbital involvement due to LCH is rare as a unifocal disease, seldom occurring outside the pediatric population. We report a case of a 21-year-old man with solitary LCH of the orbit depicted by magnetic resonance imaging (MRI) and diagnosed by histopathological examination.