Non-collagenic etiologies of muscle weakness with joint deformities: about two paradigmatic case reports.
Muscle weakness associated to marked joint deformities is not an uncommon clinical situation in daily neuromuscular clinics. These abnormalities encompass a large variety of conditions including non-primary muscle disorders. Besides well-defined and rather readily recognisable hereditary syndromes such as Bethlem myopathy or Ullrich congenital muscular dystrophy, some unusual etiologies should also be considered. We report here two paradigmatic cases in which we found mutations in two novel genes corresponding to two newly described entities (progressive pseudorheumatoid dysplasia, PPD, and infantile systemic hyalinosis, ISH) both conditions in which the clinical picture can mimick primary muscle disease.
Hospital Marin, Hendaye, France. ja.urtizberea@wanadoo.fr
J A
JA
Urtizberea
M
M
Thambyayah
I
I
Nishino
A
A
Megarbane
D055511:CCN Intercellular Signaling Proteins; D002648:Child; D017809:Fatal Outcome; D006801:Humans; D018969:Insulin-Like Growth Factor Binding Proteins / Q000235:genetics*; D016916:Joint Deformities, Acquired / Q000235:genetics*; D008297:Male; D018908:Muscle Weakness / Q000453:epidemiology / Q000235:genetics*; D009363:Neoplasm Proteins / Q000235:genetics*
D055511:CCN Intercellular Signaling Proteins; C400081:CCN6 protein, human; D018969:Insulin-Like Growth Factor Binding Proteins; D009363:Neoplasm Proteins