Table 2.

Comparisons of general imaging features of hemangioblastomas, pilocytic astrocytomas, and metastatic tumors on conventional and advanced MRI.

	Hemangioblastomas	Pilocytic astrocytomas	Metastatic tumors
Age	Adults	Children	Adults
Morphology	Cyst with a mural nodule, solid, cyst, solid and cyst	Cyst with a mural nodule, Solid	Solid with necrosis
Number	Single	Single	Multiple > single
Flow voids	+	–	+
rCBV	Prominent increased	Mild increased	Mild to prominent increased
ADC	Increased	Iso to increased	Decreased to mild increased
Lip/Lac	+ (Lip)	+ (Lac)	+ (Lip/Lac)
Cho	– or +	++	++
NAA	–	+	–

MRI: magnetic resonance imaging; rCBV: cerebral blood volume; ADC: apparent diffusion coefficiency; Lip/Lac: lipid and/or lactate; +: present; Cho: choline; −: absent; ++: elevated; NAA: N-acetylaspartate.