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Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. CT axial - soft tissue window - without constrast
[Technique, 106mAs, 120 KVP, 3mm SL]
Seen is a gas density ? fluid level well circumscribed lobulated lesion with thin sclerotic margin (arrows) involving pubic bone portion of the left acetabulum. Note the normal appearance of adjacent bone, hip joint and surrounding soft tissue.

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. CT axial - bone window - without constrast
[Technique, 106mAs, 120 KVP, 3mm SL]
Seen is a gas density ? fluid level well circumscribed lobulated lesion with thin sclerotic margin (arrows) involving pubic bone portion of the left acetabulum. Note the normal appearance of adjacent bone, hip joint and surrounding soft tissue

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. CT Coronal - soft tissue window - without constrast
[Technique, 106mAs, 120 KVP, 3mm SL]
Seen is a gas density ? fluid level well circumscribed lobulated lesion with thin sclerotic margin (arrows) involving pubic bone portion of the left acetabulum. Note the normal appearance of adjacent bone, hip joint and surrounding soft tissue.

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. CT Coronal - bone window - without constrast
[Technique, 106mAs, 120 KVP, 3mm SL]
Seen is a gas density ? fluid level well circumscribed lobulated lesion with thin sclerotic margin (arrows) involving pubic bone portion of the left acetabulum. Note the normal appearance of adjacent bone, hip joint and surrounding soft tissue.

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - supine - without contrast
T1WI ( T1 weighted images) [SL 3, TE 19,TR 778]
The fluid component of the lesion appears of intermediate signal

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - supine - without contrast
T1WI FAT SAT ( T1 weighted images with fat saturation) [SL 3, TE 19,TR 674]
No fat suppresion in the lesion demonstrated

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - supine - with contrast
T1WI FAT SAT ( T1 weighted images with fat saturation) [SL 3, TE 19,TR 674, 4 ml of Gadolinium]
No abnormal post contrast injection enhancement

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - supine - without contrast
GER ( Gradient recalled weighted images) [SL 3, TE 9.84, TR 500]
The fluid inside the lesion show two levels of low signal above and high signal below.

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - supine - without contrast
T2WI ( T2 weighted images) [SL 3, TE 120, TR 5550]
Shows high T2WI signal intensity of the fluid with clear level

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - prone - without contrast
T2WI ( T2 weighted images) [SL 3, TE 120, TR 5550]
Shows free movement of the fluid along the lesion wall

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - prone - without contrast
DWI ( diffusion weighted images) [SL 3, TE 104, TR 5719]
Show restriction of diffusion.

Click 14 year-old boy with incidental left acetabular intraosseous pneumatocyst. MRI axial - prone - without contrast
ADC mapping (Apparent Diffusion Coefficient map) [SL 3, TE 104, TR 5719, ep_b0_1000]
Show restriction of diffusion.