Juvenile dermatomyositis (JDM)

Case contributed by Luis Valdivieso
Diagnosis certain


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

Patient Data

Age: 15 years
Gender: Female

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


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.

How to use cases

You can use Radiopaedia cases in a variety of ways to help you learn and teach.

Creating your own cases is easy.