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Table 1 Demographic details, laboratory results, radiologic findings and clinical description of study patients

From: Magnetic resonance findings may aid in diagnosis of protracted febrile myalgia syndrome: a retrospective, multicenter study

Characteristic

Patient 1

Patient 2

Patient 3

Patient 4

Patient 5

Age at manifestation

12 years

8 years

6 months

9 years

16 years

Sex

Male

Female

Female

Female

Male

Ethnicity – country of origin

Egypt, Turkey Bukharin

Morocco

Morocco, Persia, Egypt

Morocco

Morocco, Libya

FMF genetic MEFV mutation

Compound heterozygous

M694V, V726A

Heterozygote M694V

Homozygote

M694V

Heterozygote M694V

Heterozygote M694V

Total days of fever ≥ 38 DC

10

4

1

3

1

Days of hospitalization

9

12

28

23

6

Asymmetric myalgia

Yes

Yes

No

Yes

No

Corticosteroids treatment

No

Yes

No

Yes

No

CRP max value (mg/dL)

27.6

15

9.4

24.6

8.14

WBC max value (K/microliter)

19

13.3

30

29.3

11

ESR max value (mm/h)

89

81

79

ND

85

MRI findings

High T2FS signal within the arm muscles (Triceps, Biceps and Brachialis) compatible with myositis.

High signal with enhancement of the calve muscles. Normal bone marrow.

Confluent muscle edema. Muscular atrophy with fat hyperplasia.

Bilateral calf edema and increased signal intensity of the gastrocnemius muscles

Increased diffuse signal intensity in T2FS of thigh muscles with enhancement after gadolinium injection.

  1. CRP, C-reactive protein; DC, degrees Celius; ESR, estimated sedimentation rate; FMF, familial Mediterranean fever; MEFV, Mediterranean fever gene; MRI, magnetic resonance imaging; ND, not done; PFMS, protracted febrile myalgia syndrome