PMC8311839_01
Transverse CT image showing deep pelvic abscess located at presacral region before drainage (red arrows).
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Computed tomography (CT) was performed, and L5/S1 vertebral space pyogenic spondylodiscitis was noticed along with left facet joint destruction and presacral abscess located in ventral sacral surface (Fig. 1). 
Transverse CT image showing bone marrow biopsy needle penetrating the sacrum.
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The needle was gradually advanced through the left sacrum pedicle by applying forward pressure and rotation (Fig. 2). 
Transverse CT image showing drainage catheter placement.
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Fr locking pigtail catheter (Cook medical) was passed over the guide wire into the cavity. Finally, the guide wire was removed leaving the catheter within the abscess cavity (Fig. 3).