Increased variability in muscle fiber diameter

What it means

An abnormally high degree of muscle fiber size variation. This phenotypic feature can be observed upon muscle biopsy.

This finding can be demonstrated by muscle biopsy.

Rare diseases that can present with this28

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Increased fiber size variation · Increased fibre size variation · Increased variability in muscle fiber size · Increased variability in muscle fibre diameter · Increased variability in muscle fibre size · Increased variation in fiber size · Increased variation in fibre size · Increased variation in muscle fiber size