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Cobblestone Malformation in LAMA2 Congenital Muscular Dystrophy (MDC1A).


ABSTRACT: Congenital muscular dystrophy type 1A (MDC1A) is caused by recessive variants in laminin ?2 (LAMA2). Patients have been found to have white matter signal abnormalities on magnetic resonance imaging (MRI) but rarely structural brain abnormalities. We describe the autopsy neuropathology in a 17-year-old with white matter signal abnormalities on brain MRI. Dystrophic pathology was observed in skeletal muscle, and the sural nerve manifested a mild degree of segmental demyelination and remyelination. A diffuse, bilateral cobblestone appearance, and numerous points of fusion between adjacent gyri were apparent on gross examination of the cerebrum. Brain histopathology included focal disruptions of the glia limitans associated with abnormal cerebral cortical lamination or arrested cerebellar granule cell migration. Subcortical nodular heterotopia was present within the cerebellar hemispheres. Sampling of the centrum semiovale revealed no light microscopic evidence of leukoencephalopathy. Three additional MDC1A patients were diagnosed with cobblestone malformation on brain MRI. Unlike the autopsied patient whose brain had a symmetric distribution of cobblestone pathology, the latter patients had asymmetric involvement, most severe in the occipital lobes. These cases demonstrate that cobblestone malformation may be an important manifestation of the brain pathology in MDC1A and can be present even when patients have a structurally normal brain MRI.

SUBMITTER: Jayakody H 

PROVIDER: S-EPMC7445049 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Cobblestone Malformation in LAMA2 Congenital Muscular Dystrophy (MDC1A).

Jayakody Himali H   Zarei Sanam S   Nguyen Huy H   Dalton Joline J   Chen Kelly K   Hudgins Louanne L   Day John J   Withrow Kara K   Pandya Arti A   Teasley Jean J   Dobyns William B WB   Mathews Katherine D KD   Moore Steven A SA  

Journal of neuropathology and experimental neurology 20200901 9


Congenital muscular dystrophy type 1A (MDC1A) is caused by recessive variants in laminin α2 (LAMA2). Patients have been found to have white matter signal abnormalities on magnetic resonance imaging (MRI) but rarely structural brain abnormalities. We describe the autopsy neuropathology in a 17-year-old with white matter signal abnormalities on brain MRI. Dystrophic pathology was observed in skeletal muscle, and the sural nerve manifested a mild degree of segmental demyelination and remyelination.  ...[more]

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