Parasitic myositis

Parasitic myositis is a rare inflammatory muscle disease caused by the invasion of skeletal muscle tissue by parasitic organisms. It is classified among the infectious myopathies and can be caused by a variety of parasites, including protozoa (such as Trypanosoma cruzi, Toxoplasma gondii) and helminths (such as Trichinella spiralis, Taenia solium causing cysticercosis, and Sarcocystis species). The condition primarily affects the musculoskeletal system, though systemic involvement may occur depending on the causative organism. Patients with parasitic myositis typically present with muscle pain (myalgia), muscle tenderness, weakness, and swelling of affected muscles. Depending on the specific parasite involved, additional symptoms may include fever, fatigue, peripheral eosinophilia, skin rash, and periorbital edema. In some cases, the infection may involve the heart (myocarditis) or central nervous system. The severity of the disease ranges from mild, self-limiting muscle inflammation to severe, life-threatening systemic illness, particularly in immunocompromised individuals. Diagnosis is based on clinical presentation, laboratory findings (including elevated creatine kinase and eosinophilia), serological testing for specific parasites, imaging studies such as MRI, and sometimes muscle biopsy demonstrating parasitic organisms or larvae within muscle fibers along with inflammatory infiltrates. Treatment depends on the causative organism and typically involves antiparasitic medications (such as albendazole, mebendazole, praziquantel, or specific antiprotozoal agents), along with supportive care including anti-inflammatory drugs and corticosteroids in selected cases to manage the inflammatory response. Prognosis varies depending on the parasite species, the extent of infection, and the patient's immune status.

Age of Onset

Variable

Can begin at different ages, from infancy through adulthood

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Source: ClinicalTrials.gov · synced daily · phases, status, and PI names normalized at ingest

Source: NPI Registry + PubMed · trial PI roles cross-referenced with ClinicalTrials.gov · ranked by match score (publications + PI activity + community signal)

Source: NORD Rare Disease Centers + NIH Undiagnosed Diseases Network (UDN) · centers verified active within last 12 months

Source: PubMed + NIH RePORTER + openFDA + clinical-journal RSS · last 30 days · disease-tagged at ingest by AI extraction with human QC

Common questions about Parasitic myositis