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Vol. 57. Issue 6.
Pages 505-511 (November - December 2015)
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Vol. 57. Issue 6.
Pages 505-511 (November - December 2015)
Original article
Magnetic resonance imaging of hypertrophic olivary degeneration
Imagen por resonancia magnética en la degeneración olivar hipertrófica
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M. Blanco Ulla
Corresponding author
miguel.blanco.ulla@sergas.es

Corresponding author.
, A. López Carballeira, J.M. Pumar Cebreiro
Servicio de Radiología, Hospital Clínico Universitario de Santiago de Compostela, Santiago de Compostela, Spain
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Table 1. Epidemiological characteristics, clinical manifestations and findings in the MRI.
Abstract
Objective

To review the pathophysiologic mechanisms involved in hypertrophic olivary degeneration, with attention to epidemiological and clinical aspects and especially to imaging findings.

Material and methods

We reviewed 5 patients diagnosed with hypertrophic olivary degeneration at our center from 2010 through 2013, analyzing relevant clinical, epidemiological, and radiological findings.

Results

In all cases, a hyperintensity was seen in the inferior olivary nuclei in FLAIR and T2-weighted sequences. No signal alterations were seen on T1-weighted sequences, and no enhancement was seen after intravenous injection of contrast material. In the cases studied by diffusion-weighted imaging, no significant alterations were seen in these sequences. Olivary hypertrophy was seen in all patients except in one, in whom presumably not enough time had elapsed for hypertrophy to occur. The alterations were bilateral in two of the five cases. Only one case exhibited the typical clinical manifestations.

Conclusion

Given that patients may not present clinical manifestations that can be attributed to hypertrophic olivary degeneration, it is important to recognize the characteristic radiologic signs of this entity.

Keywords:
Magnetic resonance imaging
Brainstem
Hypertrophic olivary degeneration
Olivary nucleus
Red nucleus
Cerebellar nucleus
Medulla oblongata
Cerebellum
Resumen
Objetivo

Repasar los mecanismos fisiopatológicos de la degeneración olivar hipertrófica, prestando atención a los aspectos epidemiológicos y clínicos, y sobre todo a los hallazgos de imagen.

Material y métodos

Se revisaron 5 pacientes diagnosticados de degeneración olivar hipertrófica en nuestro centro entre los años 2010 y 2013, analizando los aspectos clínicos, epidemiológicos y radiológicos relevantes.

Resultados

En todos los casos se vio una hiperintensidad en los núcleos olivares inferiores en las secuencias FLAIR y T2. Las secuencias potenciadas en T1 no mostraron alteraciones de señal ni tampoco se observó realce tras inyectar contraste intravenoso. En los casos en los que se realizó una secuencia de difusión, no hubo alteraciones significativas. Salvo en un paciente, en el que presumiblemente no había pasado el tiempo necesario, en todos los restantes se vio una hipertrofia olivar. Las alteraciones fueron bilaterales en dos de los cinco individuos. En solo un caso las manifestaciones clínicas fueron típicas.

Conclusión

Dado que los pacientes pueden no presentar manifestaciones clínicas atribuibles a la degeneración olivar hipertrófica, resulta importante reconocer los signos radiológicos característicos.

Palabras clave:
Resonancia magnética
Tronco cerebral
Degeneración olivar hipertrófica
Núcleo olivar
Núcleo rojo
Núcleo cerebeloso
Bulbo raquídeo
Cerebelo

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