[Benign paroxysmal positional vertigo: provocation and freeing manoeuvres].

The benign paroxystic positional vertigo (BPPV) is defined by brief episodic vertigo attacks and accompanied by a rotary-linear nystagmus, triggered by head position changes and is always produced in that position. The theory that better explains the BPPV is canalithiasis: free-floating particles leave the utricular macula and enter one of the semicircular canals, producing an endolymphatic movement that stimulates the cupula and produces vertigo and nystagmus. The diagnosis is based on a typical clinical history, normal ear and neurological examination and provocation maneuvers, such as the Dix-Hallpike test, reproduce the vertigo attacks.

[Priapism: diagnosis and treatment].

Priapism, prolonged and painful erection, is an exceptional cause of consultation in the pediatric population. High- and low-flow priapism and recurrent prolonged erection must be differentiated, as the prognosis and treatment of these entities differ. Assessment of patients with priapism begins with a detailed history, physical examination, and complete blood cell count.

[Response to high dose corticosteroids in a girl with bilateral optic neuritis].

Introduction: Optic neuritis is rare in childhood. Frequently (35-52% of all cases depending on the series) they have, during their clinical course, foci of demyelination leading to the clinical picture of multiple sclerosis (MS). Since 1993, the optic neuritis study group has recommended treatment with high doses of corticosteroids, since this seemed to stop progression, improve long-term results and delay the appearance of MS.