 of interest in this work.

![CT and MRI of the pelvic area.\
**Notes:** (**A**) Bone destruction of the right sacroiliac joint with perifocal abscess formation in the right iliac muscle (white arrows); (**B**) MRI of the pelvic area, axial short-TI inversion recovery, which shows diffuse thickening and increased signal intensity in the right iliacus muscle, as well as edema in the fat surrounding the muscle (white arrows).](idr-11-1043Fig1){#f1-idr-11-1043}

![Gram staining of the pus (×1000).](idr-11-1043Fig2){#f2-idr-11-1043}

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Susceptibility testing of the isolated *Streptococcus pneumonia*

  Antimicrobial agent             MIC (µg/mL)
  ------------------------------- -------------
  Penicillin                      0.03
  Ampicillin                      0.06
  Ceftriaxone                     0.25
  Meropenem                       0.015
  Erythromycin                    4
  Tosufloxacin                    ≤0.12
  Clindamycin                     ≥8
  Vancomycin                      0.5
  Sulfamethoxazole/trimethoprim   ≤0.25

**Abbreviation:** MIC, minimal inhibitory concentration.

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Clinical profiles of the patients with pneumococcal sacroiliitis

  ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Case number   Age (yrs)   Gender   Risk factors   HIV antibody   Chief complaints                     Clinical diagnosis                         Clinical samples                             Bacteremia   Drainage       Antibiotic treatment           Treatment duration (weeks)   Outcome   Year   Reference
  ------------- ----------- -------- -------------- -------------- ------------------------------------ ------------------------------------------ -------------------------------------------- ------------ -------------- --------