Juvenile dermatomyositis (JDM)

Case contributed by Dr Luis Valdivieso

Presentation

Weakness, swelling and stiffness of the left knee for two years

Patient Data

Age: 15 years
Gender: Female
x_ray

Extensive muscular and subcutaneous dystrophic calcifications most prominent in the left lateral thigh.

ultrasound

Hyperechoic areas with posterior acoustic shadow projection at the subcutaneous-muscular plane level associated with slight perilesional edema.

Case Discussion

In addition to the clinical and imaging data, the diagnosis was confirmed with a histopathological examination of subcutaneous tissue, which reported ossification accompanied by a mild mononuclear infiltrate.

Although this case represents an isolated radiological finding in striated muscle and left muscle skin (circumscribed calcinosis), under the clinical context, systemic pathology (dermatomyositis) should be considered, which can affect other regions and organs, especially the lungs.

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