alexa Multifocal septic osteomyelitis mimicking skeletal metastatic disease in a patient with prostate cancer.
Neurology

Neurology

Journal of Spine

Author(s): Alexiou E, Georgoulias P, Valotassiou V, Georgiou E, Fezoulidis I,

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Abstract We present an unusual case of a 59 years old patient with prostate cancer, who was referred to our hospital with pleurodenia, low back and other sites of bone ostalgia, for bone scintiscan. The patient underwent a whole body bone scanning after the intravenous administration of 740MBq (99m)Tc-methylene diphosphonate (MDP). The main findings of the study were: increased radiotracer uptake at the T5, T9-T10 vertebrae, the head of the 11th rib and the area of the left sternoclavicular joint (SCJ), which were initially attributed to skeletal metastatic lesions. Another "hot" area in the left knee, was consistent with severe arthritis. Physical examination revealed fever up to 38.7°C, tenderness and swelling of his left knee and various painful sites. Due to persistent fever and markedly raised inflammatory markers (ESR 102mm/h, CRP 73.8mg/L, WBC 16.800 cells/μ L - neutrophils 78\%, lymphocytes 15\%, monocytes 5\%, eosinophils 1\%), the patient was further referred for a magnetic resonance (MR) scan with specific interest on the thoracic spine and the SCJ. In the sagittal short-tau inversion recovery (STIR) MR image, abnormally high signal involving both T9 and T10 vertebral bodies due to bone marrow oedema and irregularity of the endplates with focal destruction areas, were observed. The T9-T10 intervertebral disc had an abnormally high signal suggestive of "hot disc" sign and also a prevertebral soft tissue mass abutting the anterior aspect of the involved vertebral bodies. The axial T1-weighted image with fat saturation post gadolinium (Gd), revealed diffuse strong enhancement in the vertebral body, the paraspinal soft tissue mass and the adjacent right rib. Circumferential epidural enhancement indicative of intra-canal spread of the infection, was also noticed. Additional MR sequences covered the level of the SCJ. Extensive subarticular and soft tissue changes with fluid collection and bone oedema of the left SCJ were shown with the typical pattern of diffuse enhancement suggestive of septic arthritis. The MR imaging findings combined with the scintigraphic findings were consistent with subacute multifocal septic arthritis involving the axial skeleton, as a pyogenic spondylodiscitis at the T9-T10 level, the left SCJ joint and the left knee joint. Subsequently, aspiration of the SCJ and the left knee joint was performed. A purulent fluid was drained and sent to microbiology. The sample revealed 96.000 cells/μL (95\% neutrophils) and methicillin-resistant Staphylococcus aureus (MRSA). The patient received intravenous vancomucin (2gr. twice a day for 14 days) and subsequently the dose was adjusted to maintain the vancomucin serum levels between 17 and 20mcg/mL. The total treatment duration was 12 weeks. Four months later the patient had fully recovered and his blood tests were normal. The patient had not been referred to an oncology department yet, as the onset of the arthritis occurred about two weeks after the diagnosis of prostate cancer. In conclusion, we present a patient with known malignancy, fever, skeletal pain and multiple bone lesions in the (99m)Tc-MDP and the MRI examination, not due to metastatic disease but to septic arthritis. This article was published in Hell J Nucl Med and referenced in Journal of Spine

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