Journal
ORPHANET JOURNAL OF RARE DISEASES
Volume 17, Issue 1, Pages -Publisher
BMC
DOI: 10.1186/s13023-021-02155-y
Keywords
Familial Mediterranean fever; Magnetic resonance imaging; Myositis; M694V; Protracted febrile myalgia syndrome
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This study described the magnetic resonance imaging (MRI) findings of pediatric patients with Protracted Febrile Myalgia Syndrome (PFMS), suggesting that MRI can serve as an auxiliary diagnostic tool in PFMS.
Background Protracted febrile myalgia syndrome (PFMS) is a rare complication of Familial Mediterranean fever (FMF). The diagnosis is based on clinical symptoms and is often challenging, especially when PFMS is the initial manifestation of FMF. The aim of this report was to describe the magnetic resonance imaging (MRI) findings in pediatric patients with PFMS. Results There were three girls and two boys ranging in age from 6 months to 16 years, all of Mediterranean ancestry. Three had high-grade fever, and all had elevated inflammatory markers. MRI of the extremities yielded findings suggestive of myositis, which together with the clinical picture, normal CPK levels, and supporting family history of FMF, suggested the diagnosis of PFMS. Out of most common MEFV mutations tested, one patient was homozygous for M694V mutation, three were heterozygous for M694V mutation, and one was compound heterozygous for the M694V and V726A mutations. Conclusions MRI may serve as an auxiliary diagnostic tool in PFMS.
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