Vertebral Osteomyelitis: An Unusual Presentation of Bartonella henselae Infection

Objectives To report cases of cat scratch disease with vertebral osteomyelitis. Methods We describe clinical features, diagnostic, treatment, and outcome of 2 patients with vertebral osteomyelitis due to Bartonella henselae and provide a review of the relevant literature. Results A 47-year-old man was investigated for fever, splenomegaly, and cervical adenopathy. A lymphoma was suspected on the clinical picture, the laboratory tests, and the computed tomographic scan. [18 F]-fluoro-2-deoxy- d -glucose-positron emission tomography detected splenic nodules and a hypermetabolic focus of C7 vertebral body compatible with a vertebral osteomyelitis on magnetic resonance imaging. B henselae infection was confirmed by polymerase chain reaction performed on lymph node biopsy. A 34-year-old woman was investigated for fever and right upper quadrant abdominal pain. She had consulted 2 weeks before for a unique lesion of right index and an axillar adenopathy that have improved spontaneously. A technetium bone scan performed 1 week later because of a thoracic backache demonstrated an increased uptake of the T6 vertebra. Vertebral magnetic resonance imaging was compatible with a T6 osteomyelitis. B henselae infection was confirmed by serology (seroconversion). Both patients were treated with rifampin and doxycycline and recovered within 3 months. Conclusions B henselae vertebral osteomyelitis can involve immunocompetent adults. In the case of vertebral osteomyelitis with negative blood cultures, recent history of local lymphadenopathy and cat exposure must be investigated and B henselae serology must be performed. Nevertheless, even if serology is positive, vertebral biopsy is required to rule out other pathogens or malignancy. B henselae infection can be confirmed by polymerase chain reaction performed on vertebral or lymph node biopsy.