Table 4.

Differential diagnosis for Rosai-Dorfman disease localized to the epidural spine and associated imaging findings on MRI.

Disease	MRI
Rosai-Dorfman	T1WI iso- or hypo-intense; T2WI hypo- and/or iso-intense; homogenous enhancement
Meningioma	95% intradural; T1WI iso-intense; T2WI iso-intense or hyper-intense > hypo-intense; homogenous enhancement
Metastasis	Vertebral involvement common; T1WI hypo-intense; T2WI hyper-intense > hypo-intense or iso- intense; homogenous enhancement
Sub-acute or Chronic Epidural Hematoma	Lentiform; early subacute = T1WI hyper-intense and T2WI hypo-intense; late subacute = T1WI and T2WI hyper-intense, chronic = T1WI and T2WI hypo-intense; peripheral or no enhancement
Epidural Abscess/phlegmon	T1WI iso- or hypo-intense; T2WI hyper-intense; peripheral enhancement (abscess); homogenous enhancement (phlegmon)
Lymphoma	T1WI iso-intense; T2WI iso- or hyper-intense > hypo-intense; homogenous enhancement
Sarcoidosis	T1WI hypo- or iso-intense; T2WI hyper-intense; homogenous enhancement
IgG4-Related Meningeal Disease	T2WI hypo- or hyper-intense; homogenous enhancement *

^*= T1WI findings not reported