Molecular diagnosis of pseudohypoparathyroidism type Ib in a family with presumed paroxysmal dyskinesia.
We describe 2 sisters diagnosed initially with paroxysmal kinesigenic choreoathetosis, a condition characterized by brief episodes of spasms precipitated by sudden movement. However, subsequent testing showed hypocalcemia, hyperphosphatemia, and elevated parathyroid hormone levels consistent with pseudohypoparathyroidism type Ib. This diagnosis was confirmed by genetic testing, which identified a 3-kilobase deletion on chromosome 20q13.3. Our report describes the neurologic presentation, metabolic derangement, and underlying genetic mutation in a family. It also reinforces the importance of metabolic testing in the evaluation of pediatric patients with movement disorders.
Mahmud
Farid H
FH
Department of Pediatric Endocrinology and Metabolism, Mayo Clinic, Rochester, Minnesota 55905, USA. lteif.aida@mayo.edu
Linglart
Agnès
A
Bastepe
Murat
M
Jüppner
Harald
H
Lteif
Aida N
AN
D002648:Child; D002819:Chorea / Q000175:diagnosis*; D002872:Chromosome Deletion; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D006996:Hypocalcemia / Q000175:diagnosis; D010375:Pedigree; D010758:Phosphorus / Q000097:blood; D011547:Pseudohypoparathyroidism / Q000175:diagnosis* / Q000235:genetics
D010758:Phosphorus