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'''Benign acute childhood myositis''' (BACM) is a syndrome characterized by muscle weakness and pain
==Symptoms==
Prodromal symptoms are typically fever, cough, and rhinorrhea. BACM symptoms that follow are most frequently calf pain, gait complaints, and inability to walk.<ref name=azevedo/> The condition is self-limited and full restitution can be expected. In very rare cases, however, [[rhabdomyolysis]] may develop.<ref name=brisca/>
Affected are preschool and school-age children with a male predominance.<ref name=azevedo/> In one study, the median age was 6 years (range
==Diagnosis==
The history of a preceding influenza-like infection followed by the typical symptoms of acute onset of symmetrical calf pain and gait problems together with an isolated finding of a high level of [[creatine kinase]] suggests the diagnosis of BACM.<ref name=chu>{{cite journal| vauthors=Chu EC, Yip AS| title= A rare presentation of benign acute childhood myositis |journal=Clin Case Rep |year=2019 |volume=7 |issue=3 |
[[Guillain-Barré syndrome]] (GBS) is the main consideration in the differential diagnosis. It needs to be quickly excluded as early intervention in GBS is indicated. Other conditions under possible consideration are [[dermatomyositis]], [[muscular dystrophy]], [[juvenile idiopathic arthritis]], [[transient synovitis of the hip]], [[osteomyelitis]], and [[myalgia]].<ref name=brisca/>
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==Preceding viral infections==
A number of different preceding viral infections have been reported, most commonly [[influenza A]] and [[influenza B|B]]. The condition appears to be more prevalent during late fall, winter, and spring.<ref name=azevedo/> Other virus infections that have been linked to BACM are those caused by [[Parainfluenza]], [[Coxsackievirus]], [[Adenovirus]], [[Echovirus]], and [[Mycoplasma pneumonia]].<ref name=brisca/>
Viral myositis after viral infections may also occur in adults, and viruses, such as COVID-19, have been reported as a rare cause of myositis.<ref>{{cite journal | vauthors = Saud A, Naveen R, Aggarwal R, Gupta L | title = COVID-19 and Myositis: What We Know So Far | journal = Current Rheumatology Reports | volume = 23 | issue = 8 | pages = 63 | date = July 2021 | pmid = 34216297 | pmc = 8254439 | doi = 10.1007/s11926-021-01023-9 }}</ref>
==Management==
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==History==
in 1957 Lundberg reported on a group of patients with a condition he named ''myalgia cruris epidemica'',<ref>{{cite journal| author=Lundberg A |title= Myalgia cruris epidemica |journal= Acta Paediatr (Stockh)| year=1957| volume=46 |issue=1 |
==References==
{{Reflist}}
==
{{Medical resources
[[Category: Inflammations]]▼
| DiseasesDB =
[[Category: Muscular disorders]]▼
| ICD10 = M60.9
[[Category: Pediatrics]]▼
| ICD9 =
| ICDO =
| OMIM =
| MedlinePlus =
| eMedicineSubj =
| eMedicineTopic =
| eMedicine_mult =
| Orphanet =206991
}}
{{Navbox
| name = Myopathy
| title = Symptoms and [[Myopathy|conditions]] relating to [[muscle]]
| state = {{{state<includeonly>|autocollapse</includeonly>}}}
| listclass = hlist
| group1 = [[Pain]]
| list1 =
* [[Myalgia]]
** [[Fibromyalgia]]
** [[Acute muscle soreness|Acute]]
** [[Delayed onset muscle soreness|Delayed onset]]
| group2 = [[Inflammation]]
| list2 =
* [[Myositis]]
** [[Pyomyositis]]
** Benign acute childhood myositis
| group3 = Destruction
| list3 =
* [[Muscle weakness]]
* [[Rhabdomyolysis]]
* [[Muscle atrophy]]/[[Amyotrophy]]
| group4 = Other
| list4 =
* [[Myositis ossificans]]
** [[Fibrodysplasia ossificans progressiva]]
* [[Compartment syndrome]]
** [[Anterior compartment syndrome of the lower leg|Anterior]]
* [[Diastasis (pathology)|Diastasis of muscle]]
** [[Diastasis recti]]
* [[Spasm|Muscle spasm]]
* [[Metabolic myopathy|Metabolic myopathies]]
}}
[[Category:Rare diseases]]
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