Nos complace compartir un estudio de caso veterinario capturado por el adaptador de imágenes de quikvue ocular del veterinario del Dr. Viroux.

Se presentó un gato europeo de 8 años casualizado para la mydriasis bilateral sin pérdida de visión.

Examen clínico: No abnormalities were found.

Examen oftalmológico: The menace response and Dazzle reflex were both positive, but the pupillary light reflexes were negative. The iris showed no atrophy, and the fundus was normal.

Se sospechó la participación neurológica, and an MRI exam was recommended but not performed at that time.

Tres meses después, the cat was presented again with disorientation and vision loss progressing over several days.

Examen clínico: No abnormalities were found, and blood pressure was normal at 150 mmHg.

Examen oftalmológico: This time, a negative menace response was observed on the right and diminished on the left, with a negative Dazzle reflex. The rest of the examination was unremarkable.

Examen de resonancia magnética was recommended again to explore intracranial causes, which was accepted this time. The MRI revealed a large mass invading the pituitary fossa and optic foramina, along with subtle signs of intracranial hypertension.

Explicación: The nerve fibers responsible for the pupillary light reflex decussate after the optic nerve decussation, caudal to the optic chiasm. This anatomical feature could explain why bilateral mydriasis occurred before vision loss, as these neural pathways do notParticipar en la visión.