Toxoplasmosis differential diagnosis

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] ; Associate Editor(s)-in-Chief: Aditya Ganti M.B.B.S. [2]

Differential Diagnosis

Disease	Differentiating signs and symptoms	Differentiating tests
CNS lymphoma		Brain biopsy
Metastatic brain tumor
Mycobacterial CNS	Prior history of residence in an endemic area. Chronic cough, weight loss, hemoptysis	PCR of CSF for tuberculosis Mycobacterial culture of CSF Brain biopsy for acid-fast bacilli staining Culture and acid stain positive for acid-fast bacilli CXR shows cavitations.
Aspergillosis	Pulmonary lesions in addition to CNS lesions. Symptoms may include cough, chest pain, and hemoptysis.	CSF fungal culture, galactomannan.
Cryptococcosis	Symptoms include cough, chest pain, and hemoptysis	Cryptococcal antigen from CSF and serum CSF fungal culture
Chaga's disease	History of residence in Central and South America Acute infection is rarely symptomatic, Encephalitis or focal brain lesions Myocarditis Chronic infections in immunocompromised patients develops into encephalitis with necrotic brain lesions causing mass effect.	Trypanosoma cruzi in blood, tissue or CSF, PCR of tissue or body fluids, serologic tests.
CMV infection	Most common CNS opportunistic infection in AIDS patients Presents with encephalitis, retinitis, progressive myelitis or polyradiculitis. In disseminated disease, it involves both liver and renal organs.	Brain CT/MRI/biopsy: location of lesions are usually near the brain stem or periventricular areas. PCR of CSF with detectable virus is diagnostic. Brain biopsy with + staining for CMV or evidence of owl's eyes is also diagnostic, but it is rarely performed, because of the location of brain lesions.
HSV infection	Seizures, headache, confusion and/or urinary retention can be seen in disseminated disease, which usually affects only immunocompromised or acute infections *In pregnant women it may be associated with concurrent genital/oral lesions; can be spread to the neonate during acute infection in the mother, or via viral shedding in the birth canal. Neonatal HSV can range from localized skin infections to encephalitis, pneumonitis, and disseminated disease.
VZ infection
Bacterial abscess
Progressive multifocal leukoencephalopathy
Cat Scratch Disease

References

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