[DIAGNOSTIC VARIATIONS OF X-LINKED MUSCULAR DYSTROPHY WITH CONTRACTURES]

Area of Science:

• Neurology
• Genetics
• Muscular Dystrophy Research

Background:

• X-linked muscular dystrophies (XLMD) represent a group of inherited disorders affecting muscle tissue.
• Rotthauwe-Mortier-Bayer muscular dystrophy is a rare form of XLMD characterized by specific clinical and pathological features.

Observation:

• A case report and review focusing on two male cousins diagnosed with X-linked muscular dystrophy with contractures.
• The condition manifested in early childhood (ages 5-10) with progressive symptoms including tendon retraction, limited neck and spine mobility, and atrophy of shoulder, pelvic, and back muscles.
• Affected individuals maintained intact intellect but exhibited cardiomyopathy; creatine kinase (CK) levels were normal.

Findings:

• Electromyography (EMG) revealed classic myopathic features.
• Muscle biopsy demonstrated variations in muscle fiber caliber and increased endo-perimesial connective tissue growth.
• The combined clinical, electrophysiological, and histological data strongly suggest a diagnosis consistent with Rotthauwe-Mortier-Bayer X-linked muscular dystrophy.

Implications:

• This case highlights the diagnostic challenges of XLMD, particularly when CK levels are normal.
• Understanding the specific presentation of Rotthauwe-Mortier-Bayer muscular dystrophy aids in accurate diagnosis and potential therapeutic strategies.
• Further research into the genetic basis and pathophysiology of this rare XLMD subtype is warranted.