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{{Orphan|date=January 2023}}
'''Benign acute childhood myositis''' (BACM) is a syndrome characterized by muscle weakness and pain of the lower limbs that develop in children after a recent viral illness. It is transient with a spontaneous clinical resolution within 1 week.<ref name=brisca>{{cite journal|vauthors=Brisca G, Mariani M, Pirlo D, et al |title=Management and outcome of benign acute childhood myositis in pediatric emergency department|journal=Italian Journal of Pediatrics |volume=47 |issue=1 |pages=
==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 2-13.2 years).<ref name=brisca/> It has been estimated that BACM has an incidence of 2.69 cases per 100,000 children (<18 years) during epidemic seasons and 0.23 cases during non-epidemic seasons.<ref>{{cite journal|vauthors= Buss BF, Shinde VM, Safranek TJ, Uyeki TM| title= Pediatric influenza-associated myositis - Nebraska, 2001-2007. |journal=Influenza Other Respir Viruses.| year=2009 |volume=3 |issue=6| pages=277–85| doi=10.1111/j.1750-2659.2009.00102.x|
==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 |pages=461–464 |doi=10.1002/ccr3.2001 |
[[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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==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 |pages=18–31| doi=10.1111/j.1651-2227.1957.tb08627.x |
==References==
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