A 50-year-old man presented to the emergency room with several months of intermittent fever and progressive lower back pain. He described a mechanical fall one week prior to this admission. He had a medical history of alcohol abuse, intravenous drug use, hepatitis C infection, and native tricuspid valve infective endocarditis secondary to methicillin-resistant Staphylococcus aureus (MRSA) five months prior to his current hospital admission. At that time, his transthoracic echocardiogram showed a tricuspid valve vegetation measuring 11 × 6 mm with severe tricuspid regurgitation. He was partially treated with intravenous vancomycin followed by daptomycin with serial negative blood cultures. Magnetic resonance imaging (MRI) of his spine at that time showed no evidence of vertebral osteomyelitis or epidural abscess.\nTwo months prior to the current hospital admission, he presented to the emergency room with back pain. At this time, his blood cultures were positive for the growth of V. dispar, which was identified by matrix-assisted laser desorption/ionization-time of flight mass spectrometry. A transthoracic echocardiogram was performed prior to him leaving the hospital against medical advice and showed that the tricuspid valve vegetation was now smaller in size, measuring 7 × 6 mm (Figure ). He received no antimicrobial treatment at this time.\nDuring his current hospital admission, he was visibly agitated on physical examination and described significant lower back pain. His initial vital signs included a temperature of 39.5 degrees Celsius, heart rate of 120 beats per minute, respiratory rate of 20 breaths per minute, oxygen saturation of 97% on ambient room air, and blood pressure of 106/68 mmHg. His neck was supple and his neurological examination demonstrated normal tone throughout his upper and lower extremities. Strength in his right lower extremity was 3/5 for ankle plantar flexion and dorsiflexion, 2/5 for knee extension and flexion, and 3/5 for hip extension and flexion. His strength was 4/5 throughout his left lower extremity. His sensation was normal apart from decreased light touch sensation to his medial right gastrocnemius region. He had spinal and paraspinal tenderness in his mid and lower back. His reflexes were 2+ in his knees and plantars were down-going bilaterally. He had a grade III/VI systolic murmur best heard at the left lower sternal border. Air entry was equal and clear bilaterally with fine crackles to his right lower lung zone. No other peripheral stigmata of infective endocarditis were present on examination. Examination of the oral cavity showed he was missing upper teeth with overall poor dentition. Initial laboratory investigations are summarized in Table .\nHis electrocardiogram was normal. During his hospital admission, two sets of blood cultures obtained 96 hours apart were again positive for the growth of V. dispar. Given his persistent bacteremia, a transthoracic echocardiogram was performed which showed growth in the size of the vegetation previously noted on his tricuspid valve, now measuring 11 × 7 mm. There were also signs of torrential tricuspid regurgitation including a vena contracta width greater than 0.7 cm, a central jet that was filling greater than 50% of the right atrium, and a triangular-shaped continuous-wave Doppler signal which was as dense as the inflow signal along with evidence of systolic hepatic vein flow reversal (Figures , ).\nAn MRI scan of the spine showed early discitis/osteomyelitis of L3-L4 with a right paravertebral and right paracentral anterior epidural phlegmon with no abscess (Figure ). The neurosurgical team assessed the patient and recommended conservative management with ongoing antimicrobial therapy and physiotherapy, and monitoring for any worsening neurological deficits. In addition, given his poor dentition, a computed tomography (CT) scan of the brain, head, and neck was arranged, which showed no obvious evidence of an abscess collection within the neck, oropharynx, or brain. Furthermore, no septic pulmonary emboli were seen on imaging.\nSusceptibility testing was performed on his V. dispar isolate using broth microdilution and showed susceptibility to penicillin (minimum inhibitory concentration [MIC] < 0.5), amoxicillin-clavulanate (MIC < 4/2), and metronidazole (MIC < 8) compared against breakpoints according to the Clinical and Laboratory Standards Institute. He was treated with intravenous ceftriaxone for six weeks with clinical improvement noted within a few days following his admission. The patient reported near-complete resolution of his back pain and his repeat C-reactive protein level toward the end of therapy was 3.8 mg/L (normal 0.0-7.0 mg/L). Subsequently, he developed a central-line-associated bloodstream infection secondary to Candida dubliniensis with no evidence of endophthalmitis, for which he received a two-week course of intravenous caspofungin.\nA repeat MRI was arranged after his therapy which showed resolution of the anterior epidural phlegmon but interval worsening of the L3-L4 discitis/osteomyelitis with a new enhancement of the L3 and L4 facets without effusion (Figure ). A subsequent CT-guided lumbar spine biopsy of the L3/L4 region was performed, and bacterial, fungal, and mycobacterial cultures were negative. A repeat transthoracic echocardiogram was planned to establish a new baseline for his valvular anatomy given his risk of recurrent endocarditis; however, the patient left against medical advice.
A 79-year-old man presented with a 1-month history of constant lower back pain (LBP) radiating to the right thigh. The pain had been increasing over time. Movements aggravated the symptoms. The patient reported 10 out of 10 points in the visual analog scale. He was afebrile but reported intermittent chills at night. There was no history of recent gastrointestinal procedures, dental diseases/procedures, oncological diseases, immunodeficiency, diabetes, or intravenous drug use.\nOn examination, the lumbar paravertebral muscles were tender, hip flexion on the right side revealed slightly paresis (M4/5), and minimal movement of the spine or the limbs was accompanied by severe pain.\nOn admission, the inflammation markers were elevated (C-reactive protein [CRP] 54,4 mg/l, white blood cells [WBC] count = 13,6 G/l, platelet count = 344 G/l). X-ray and a ct-scan of the lumbar spine revealed destruction of the intervertebral space L3/4 and the corresponding endplates. Because of the bony destruction, the L4-body presented an anterior wedging. The standing X-ray revealed a segmental kyphosis as a result of the wedge deformity of L4-body and the collapsed disc space L3/4 []. Blood cultures taken on admission were negative. During the next 12 h, the pain got worse, and the patient developed urinary retention, which required a bladder catheterization. MRI-scan of the lumbar spine 12 h after admission revealed an advanced spondylodiscitis L3/4 with a liquefied disc, blurred endplates, and a collection of two abscesses in the right psoas muscle. Furthermore, a diffuse signal enhancement in both psoas muscles and the autochthone muscles from L3 to S1 [] was shown. A ct-guided fine needle biopsy was performed, and the empiric intravenous antibiotic therapy with amoxicillin/clavulanate 2.2 g 4 times daily intravenously (iv.) was initiated. As the results of the biopsy did not show any growth of bacteria amoxicillin/clavulanate was stopped. After an antibiotic-free interval of 5 days (9 days after the CT-guided biopsy), an open transpedicular biopsy was performed. On the same day, iv. amoxicillin/clavulanate was resumed. The bacteriological examinations on aerobic/anaerobic cultures showed no results. The eubacterial PCR (16S rDNA-sequencing) revealed V. parvula as the causing pathogen. The antibiotic therapy was switched to ceftriaxone 2 g iv. and metronidazole 500 mg i.v. A CT of the abdomen was performed on day 21, which showed increasing abscess collection in the right psoas major of 4.1 × 4.6 cm [] but no signs of intraabdominal malignancy. A drain was inserted into the right psoas muscle, and the abscess formation was subsequently drained for 4 days.\nAbnormal high calcium levels revealed an incidental parathyroid adenoma, which had to be removed surgically. Because of the additional surgery, the patient was discharged on day 27. On day 39, the patient presented himself in good health and pain-free to our outpatient clinic. Inflammation markers had normalized (CRP 2 mg/l, normal WBC count). A small residual abscess collection in the right psoas muscle was discovered on CT scan. The CT-scans and the standing X-rays of the lumbar spine showed no instability of the spine without any progression of the kyphotic deformity L3/L4. The antibiotics were switched to amoxicillin/clavulanate 1 g po 3 times daily for another 2 weeks, completing 6 weeks of the antibiotic treatment altogether. The patient presented himself to the last follow-up at day 95 in perfect shape, without any symptoms, and further changes in the lumbar spine X-rays [].\nThere was no external immobilization of the spine during the whole duration of the treatment.