Infectious Myositis

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Overview

MRI of myositis of the gastrocnemius and multiple abscesses of the posterior compartment caused by community-acquired methicillin-resistant Staphylococcus. [1].

By [Chris Santucci]

Infectious Myositis is an infection that can be caused by microbes of all domains. It is characterized by muscle inflammation and usually is seen in voluntary muscle It is an uncommon infection and is very diverse in the way it can come about. Infectious myositis can result from surgeries in which incisions allow microbes in, wounds that are contaminated, injectable drug needles that are unsterilized, undercooked foods, among other reasons, making it difficult to detect and prevent at first. Immunocompromised individuals are always at risk for myositis. Myositis is not caused by one microbial group, but rather can be caused by a broad range of microbes including bacteria, fungi, viruses, and parasites. The infection can be polymicrobial, but in many cases one organism dominates the infected site. In order to identify the specific microbe responsible, culturing is necessary. This page hopes to express the vast array of infection and treatments associated with the main types of myositis.

To the right is a photograph depicting a patient with myositis of the gastrocnemius. This is a typical case of myositis in voluntary skeletal muscle.

MRI of myositis of the gastrocnemius and multiple abscesses of the posterior compartment caused by community-acquired methicillin-resistant Staphylococcus. [2].

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Legend/credit: MRI of myositis of the gastrocnemius and multiple abscesses of the posterior compartment caused by community-acquired methicillin-resistant Staphylococcus. [9].
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Bacterial Infectious Myositis

Magnetic resonance imaging of myositis by S. viridians in the bicep of an anabolic steroid user. [3].

CT scan of psoas abscess by Streptococcus pyogenes in HIV patient. [4].

CT scan of psoas abscess by Streptococcus aereus. [5].

MRI of Group B_streptococcal myositis in right rectus muscle identified with the arrow. [6].

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Myositis by Fungi

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Myositis by Viral infection

MRI of bicep parasitic myositis by Taenia solium. [7].

Parasitic Myositis

Micrograph of the unidentified fungi in a case of fungal myositis. [8].

References

Authored for BIOL 238 Microbiology, taught by Joan Slonczewski, 2017, Kenyon College.