%0 Journal Article %T Tumor-like Lesions in Primary Angiitis of the Central Nervous System: The Role of Magnetic Resonance Imaging in Differential Diagnosis. %A Zedde M %A Napoli M %A Moratti C %A Pavone C %A Bonacini L %A Di Cecco G %A D'Aniello S %A Grisendi I %A Assenza F %A Boulouis G %A Nguyen TN %A Valzania F %A Pascarella R %J Diagnostics (Basel) %V 14 %N 6 %D 2024 Mar 14 %M 38535038 %F 3.992 %R 10.3390/diagnostics14060618 %X Primary Angiitis of the Central Nervous System (PACNS) is a rare disease and its diagnosis is a challenge for several reasons, including the lack of specificity of the main findings highlighted in the current diagnostic criteria. Among the neuroimaging pattern of PACNS, a tumefactive form (t-PACNS) is a rare subtype and its differential diagnosis mainly relies on neuroimaging. Tumor-like mass lesions in the brain are a heterogeneous category including tumors (in particular, primary brain tumors such as glial tumors and lymphoma), inflammatory (e.g., t-PACNS, tumefactive demyelinating lesions, and neurosarcoidosis), and infectious diseases (e.g., neurotoxoplasmosis). In this review, the main features of t-PACNS are addressed and the main differential diagnoses from a neuroimaging perspective (mainly Magnetic Resonance Imaging-MRI-techniques) are described, including conventional and advanced MRI.