Donahue does it again: a case of type 2 myotonic dystrophy from Providence, Rhode Island

A case from Dr. John Donahue, inimitable neuropathologist and neuropathology fellowship program director at Brown University:

"This is a fast myosin immunostain on a gluteus maximus biopsy from a 45-year-old woman who went on to have genetically-proven myotonic dystrophy, type 2 (DM2; proximal myotonic myopathy; PROMM).  The type 2 muscle fibers are EXTREMELY atrophic."