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Table 1 Comparison of magnetic resonance imaging characteristics of thecomas, fibrothecomas, and malignant pelvic solid masses

From: Value of diffusion-weighted imaging combined with conventional magnetic resonance imaging in the diagnosis of thecomas/fibrothecomas and their differential diagnosis with malignant pelvic solid tumors

Image features Thecoma Fibrothecoma Total Malignant pelvic solid mass
Shape     
 Round/oval 83.3 %(5/6)a 70.0 %(21/30) 72.2 %(26/36) 17.5 %(7/40)
 Lobulated 16.7 %(1/6) 26.7 %(8/30) 25.0 %(9/36) 7.5 %(3/40)
 Irregular 0 3.3 %(1/30) 2.8 %(1/36) 75.0 %(30/40)
Signal intensity    
 T1WI     
  Iso- 100 %(6/6) 100 %(30/30) 100 % (36/36) 100 %(40/40)
 T2WI     
  Hypo- 16.7 %(1/6) 60.0 %(18/30) 52.8 %(19/36) 0
  Iso- 50.0 %(3/6) 20.0 %(6/30) 25.0 %(9/36) 0
  Hyper- 33.3 %(2/6) 0 5.6 %(2/36) 100 %(40/40)
  Mixed 0 20.0 %(6/30) 16.7 %(6/36) 0
Enhancement degree    
 Minor 0 70.0 %(21/30) 58.3 %(21/36) 10.0 %(4/40)
 Mild 66.7 %(4/6) 30.0 %(9/30) 36.1 %(13/36) 50.0 %(20/40)
 Marked 33.3 %(2/6) 0 5.6 %(2/36) 35.0 %(14/40)
 Severe 0 0 0 5.0 %(2/40)
DWI signal     
 Grade 1 0 65.5 % (19/29) 54.3 %(19/35) 2.5 %(1/40)
 Grade 2 33.3 %(2/6) 27.6 %(8/29) 28.6 %(10/35) 10.0 %(4/40)
 Grade 3 66.7 %(4/6) 6.9 %(2/29) 17.1 %(6/35) 87.5 %(35/40)
Pelvic fluid     
 None 0 17.9 %(5/28) 14.7 %(5/34) 12.5 %(5/40)
 Present 100 %(6/6) 82.1 %(23/28) 85.3 %(29/34) 87.5 %(35/40)
  Minor 50.0 %(3/6) 46.4 %(13/28) 47.1 %(16/34) 15.0 %(6/40)
  Small 33.3 %(2/6) 25.0 %(7/28) 26.5 %(9/34) 15.0 %(6/40)
  Large 16.7 %(1/6) 10.7 %(3/28) 11.8 %(4/34) 57.5 %(23/40)
Border     
 Clear 100 %(6/6) 100 %(30/30) 100 %(36/36) 27.5 %(11/40)
 Not clear 0 0 0 72.5 %(29/40)
Capsule     
 Present 100 %(6/6) 96.7 %(29/30) 97.2 %(35/36) 52.5 %(21/40)
 Absent 0 3.3 %(1/30) 2.8 %(1/36) 47.5 %(19/40)
  1. T1WI T1 weighted imaging, T2WI T2 weighted imaging, DWI diffusion-weighted imaging, hypo hypointensity, iso isointensity, hyper hyperintensity
  2. a Percentage