A Rare Case Report of Dorsal Epidural Abscess Caused by Streptococcus agalactiae in a Diabetic Patient

Background: The infectious epidural abscess by Streptococcus agalactiae is a rare, and a surgical emergency with a reserved prognosis. We report, to our knowledge, a rare case of S. agalactiae epiduritis. Case report: This observation reports the case of a diabetic patient who presented with compressive neurological signs. The biological assessment showed an inflammatory syndrome, and a magnetic resonance imaging objectified epiduritis. The bacteriological study of curettage biopsy made it possible to isolate a S. agalactiae. The evolution was favorable under antibiotic treatment with disappearance of neurological and infectious signs. Conclusion: Epidural abscess with S. agalactiae must be evoked with a cytobacteriological study in front of a suggestive symptomatology, especially in case of favoring factor.


Background
Epidural abscess is a rare and better known by the development of neurosurgery, but extremely serious condition, with a potential life threat especially in patients with predisposing factor such as diabetes, hemodialysis, cancer, HIV, hematological diseases [1]. Therapeutic management must be rapid and effective to avoid serious neurological sequelae. It is a pathology whose diagnosis is clinico-radiological. Magnetic resonance imaging is the means of positive and etiological diagnosis. The etiology is most often due to Staphylococcus aureus, rarely to a Streptococcus agalactiae [1,2].
The urgency of diagnosing and treating is explained by the serious condition that can affect the functional prognosis and the using an appropriate antibiotic to stop antibiotic-resistant strains of microorganisms [2]. Despite the medical progress, the delays before diagnosis are very variable because of the often-deceptive clinical signs, and the taking of this disease remains poorly codified. The objective of this report was to highlight the rare presence of S. agalactiae, in a case of epiduritis of a diabetic patient, who presented with compressive neurological signs in a febrile context.

Case Report
presented to the emergency room with the complaint of pain localized at the spinal radicular level, motor and sensory disorders of the lower limbs, sphincter disorders aggressive installation; associated with weakness, fevers and chills that had a gradual onset. All moving for a month.

Examination
On nervous system examination founded a spinal compression syndrome; motor and sensory disorders of the lower limbs, and sphincter disorders. The rest of the clinical examination was unremarkable.

Radiological findings
Magnetic resonance imaging (MRA) showed a T1 hy- normal hemoglobin and platelet count. Blood biochemistry showed C-reactive protein (CRP) at 179 mg/l. For cytobacteriological study of the biopsy curettage, the direct examination after Gram staining showed the presence of Gram-positive Cocci in chains, the culture allowed isolating beta hemolytic colonies on blood agar ( Figure 2). The latex agglutination test objectified group B streptococci. The identification of the species isolated S. agalactiae by the BD Phoenix™ automated and the antibiogram has been done according to the recommendation of EUCAST-SF 2019 on chocolate agar. S. agalac-tiae was multi-sensitive to beta-lactam, glycopeptide, macrolide (erythromycin, spiramycin, lincomycin), fluoroquinolones (moxifloxacin, levofloxacin), gentamycin 500 and trimethoprim/sulfamethoxazole. Blood cultures were negative.

Intervention and management
After a posterior approach, general anesthesia, the patient underwent decompressive laminectomy, evacuation of abscess, and debridement at the level of D1 to L1 with curettage biopsy. The curettage product was sent for a bacteriological study.
The evolution under treatment with clavulanic acid amoxicillin and gentamicin for two months was marked by the disappearance of neurological signs and clinic-biological infectious signs.

Discussion
S. agalactiae (Group B Streptococcus) is a Gram-positive capsulated bacterium, commensal to the digestive and vaginal tracts, remains a continued source of morbidity and mortality in high-risk populations [3]. S. agalactiae infections, apart from maternofetal infections, are mainly characterized by bacteremia and arthritis, endocarditis and meningitis [4] with an increasing tendency of mortality of GBS infection in elderly patients. Epidural abscess (EA) is favored by an underlying terrain: diabetes, alcoholism, renal failure, hematologic pointense and a T2 hypersignal well as a thickening of spinal epidural of D1 to D5 (Figure 1).

Lab findings
Complete blood count reports showed with leukocytosis at

Conclusion
Clinicians must evaluate all patients who experience acute or progressive back pain, fever, and local spine tenderness for the possibility of the EA. Bacteriological examination remains essential to confirm the infectious origin of epiduritis. It must be carried out systematically to isolate the bacterium responsible and study its sensitivity to antibiotics. malignancies, cancer, iatrogenic causes such as acupuncture, traumatism or corticoid epidural injection [4,5].
Epidural abscess is an infection of bacterial origin by accumulation of pus from the epidural space which is mechanically responsible for spinal cord compression [6]. Epidural abscess is an emergency diagnostic and surgical therapeutic by decompression, pus drainage, and antibiotic therapy which cover gram negative bacteria, gram positive bacteria, and anaerobes to minimize the neurological deficit [6,7].
EA is estimated at 1 case per 20,000 hospitalizations, with a peak incidence between 55 and 65 years, with a sex-ratio of 1 [8], which occur on a favorable site of type diabetes, immunocompromised field, chronic ethylic [9]. This patient was 62-years-old; diabetes was the favoring factor. The main symptom of epiduritis is spinal pain in more than 70% of cases [10]. Onset of symptoms begins with spinal pain, spinal stiffness, and/or fever. The combination of pain or stiffness in the neck and fever should raise suspicion of EA, which is the classic triad of spinal EA [6,9,10]. All these signs were present in this patient. The diagnosis of certainty is radiological based on MRI by showing a hyperintensity in T2 with epidural enhancement, with a sensitivity and specificity that exceeds 90% [10]. The thoracic location is the most described, and the involvement affects the posterior epidural compartment in two-thirds. The patient had a dorsal localization of 4 vertebral stages (D1 to D5), and the front door was not known.
Routine biological examinations point to an infectious etiology in the presence of nonspecific neurological signs, with an infectious syndrome; polynuclear leukocytosis, and elevation of CRP. More than 60% of patients with EA have had leukocytosis [6]. Assessment of Serum C-reactive protein (CRP) [6,7]. These parameters were used in this patient to evaluate the effectiveness of the treatment put in place.
The search in PubMed by tapping on the search bar "epidural abscess" (on 17/09/2019), was found 2890 publications including 15 references were reported infectious origin to s. agalactiae of epiduritis. Epiduritis with S. agalactiae is rarely described. S. aureus is the incriminated germ in 75% of cases [6].
Treatment usually requires a combination of a drainage procedure and antibiotic therapy, like most abscesses. Medical management includes a poly-antibiotic treatment prolonged from one to three months [6]. They should choose antibiotics for Staphylococcus sp, Streptococcus sp, Hemophilus sp, and anaerobes, and they can then change treatment based on cultures and sensitivities. The patient was put on amoxicillin clavulanic acid and gentamicin. The indications for surgery are spinal cord compression and/or the absence of a favorable course of antibiotics alone [6]. The prognosis is variable; the evolution can be favorable if the care is early [8].