Medullary Tegmental Cap Dysplasia: Fetal and Postnatal Presentations of a Unique Brainstem Malformation.
AJNR Am J Neuroradiol
; 44(3): 334-340, 2023 03.
Article
en En
| MEDLINE
| ID: mdl-36822823
ABSTRACT
BACKGROUND AND PURPOSE:
Medullary tegmental cap dysplasia is a rare brainstem malformation, first described and defined by James Barkovich in his book Pediatric Neuroimaging from 2005 as an anomalous mass protruding from the posterior medullary surface. We describe the neuroimaging, clinical, postmortem, and genetic findings defining this unique malformation. MATERIALS ANDMETHODS:
This is a multicenter, international, retrospective study. We assessed the patients' medical records, prenatal ultrasounds, MR images, genetic findings, and postmortem results. We reviewed the medical literature for all studies depicting medullary malformations and evaluated cases in which a dorsal medullary protuberance was described.RESULTS:
We collected 13 patients 3 fetuses and 10 children. The medullary caps had multiple characteristics. Associated brain findings were a rotated position of the medulla, a small and flat pons, cerebellar anomalies, a molar tooth sign, and agenesis of the corpus callosum. Systemic findings included the following polydactyly, hallux valgus, large ears, and coarse facies. Postmortem analysis in 3 patients revealed that the cap contained either neurons or white matter tracts. We found 8 publications describing a dorsal medullary protuberance in 27 patients. The syndromic diagnosis was Joubert-Boltshauser syndrome in 11 and fibrodysplasia ossificans progressiva in 14 patients.CONCLUSIONS:
This is the first study to describe a series of 13 patients with medullary tegmental cap dysplasia. The cap has different shapes distinct in Joubert-Boltshauser syndrome and fibrodysplasia ossificans progressive. Due to the variations in the clinical, imaging, and postmortem findings, we conclude that there are multiple etiologies and pathophysiology. We suggest that in some patients, the pathophysiology might be abnormal axonal guidance.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Enfermedades Renales Quísticas
/
Malformaciones del Sistema Nervioso
Tipo de estudio:
Guideline
/
Observational_studies
/
Risk_factors_studies
Límite:
Child
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Female
/
Humans
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Pregnancy
Idioma:
En
Revista:
AJNR Am J Neuroradiol
Año:
2023
Tipo del documento:
Article
País de afiliación:
Israel