text: Besides MRI, thallium single-photon emission computed tomography (SPECT) scans have been studied as a diagnostic tool to distinguish between PCNSL and cerebral toxoplasmosis. It was expected that<unk>  cells with a high metabolism would accumulate more thallium than infected,inflamed or normal tissue. Initial thallium SPECT studies showed very high sensitivity and specificity of increased thallium uptake for PCNSL versus cerebral toxoplasmosis in HIV patients. Diagnostic accuracy of 201thallium SPECT is affected by the size, location, malignancy grade, and presence of necrotic and hemorrhagic areas in the lesion.
option_0: Primary central nervous system lymphoma other imaging findings
option_1: Primary central nervous system lymphoma other diagnostic studies
option_2: Autoimmune lymphoproliferative syndrome other imaging findings
option_3: Myeloproliferative neoplasm other imaging findings
option_4: Oligoastrocytoma other imaging findings
option_5: Extranodal NK-T-cell lymphoma other imaging findings
option_6: Intracerebral metastases other imaging findings
option_7: Chronic lymphocytic leukemia other imaging findings