Myotubular Myopathy (X-Linked)

X-linked myotubular myopathy (XLMTM) is a rare genetic neuromuscular disorder that is characterized by muscle weakness that is most typically severe but can range from mild to profound. Symptoms are often present at birth, though may develop later in infancy or early childhood. Rarely, symptoms may not present until adolescence or adulthood. Common symptoms include mild to profound muscle weakness, diminished muscle tone (hypotonia or “floppiness”), feeding difficulties, and potentially severe breathing complications (respiratory distress).