Open Access

Table III

Summary table by lesion studied. (Number of articles concluding to the given signal/total number of articles).

    Conventional MRI Diffusion MRI


  T1 T2 T1+C Apparent diffusion coefficient (103mm2/s) Diffusion
Radicular cyst Hyposignal
Homogeneous (4/5)
Hypersignal
Homogeneous (5/5)
Thin rim-enhancement
No enhancement of the cystic lumen
0.9–1.82 Variable (depends on the content of lesion)
Apical granuloma Hyposignal
Inhomogenous (1/3)
Hyposignal
Heterogenous (2/3)
Thicker rim enhancement compared to RC
No enhancement of the cystic lumen
   
Dentigerous Cyst Widely variable signal Hypersignal
Homogeneous (7/7)
Thin rim-enhancement
No enhancement of the cystic lumen
1.23–2.15 Variable (depends on the content of lesion)
Odontogenic keratocyst Widely variable signal Hypersignal
Heterogenous (7/10)
Thin rim-enhancement
No enhancement of the cystic lumen
0.85–1.58 Restricted
Adenomatoid odontogenic tumor Hyposignal (1/2) Slight hight signal
Heterogenous (2/2)
Small size: enhancement of the whole lesion
Large size: inhomogeneous enhancement
   
Simple bone cyst Hypo-isosignal (4/4) Hypersignal (4/4) Thin rim-enhancement 2.52–2.74 Free
Nasopalatine duct cyst Hypersignal (2/2) Hypersignal (2/2)   2.28–2.34 Free
Unicystic ameloblastoma Isosignal (4/6) Hypersignal (6/6) Thick rim-enhancement
Characteristic enhancement of an intraluminal nodule attached to the lining
*No enhancement of the lumen
  Free
Conventional ameloblastoma Widely variable signal Cystic portions: bright hypersignal (7/8)
Solid portions: moderate hypersignal (5/8)
*Enhancement of the margins of cystic portions.
*Homogenous Enhancement of solid portions.
Cystic portions: 1.94–2.84
Solid portions: 1.04–1.39
Cystic portions: Free
Solid portions: restricted
Odontogenic Myxoma Low-intermediate signal
Inhomogenous (2/3)
Hypersignal
Inhomogenous (2/3)
(Mixture of myxoid portions and collagenous portions.
*Inhomogeneous enhancement: only enhancement of collagenous portions. 2.091 Free

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