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Table 1 Clinical and histopathologic features which may aid the distinction between SEPN1-related and RYR1-related forms of Multi-minicore disease (MmD).

From: Multi-minicore Disease

Feature

SEPN1-related MmD

RYR1-related MmD

Clinical

  

Extraocular involvement

-

++

Bulbar involvement

+

+

Respiratory involvement

+++

+

Scoliosis

+++

++

Malignant hyperthermia susceptibility

-

+

Histopathology

  

Type 1 predominance/uniformity

+

+++

Increase internal nuclei

+

+++

Multiple large cores ("multicores")

+

+++

Numerous small cores ("minicores")

+++

+

  1. (-) = feature not reported, (+) = feature reported, (++) = common feature, (+++) = very common feature