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Journal of Clinical Microbiology, August 2003, p. 3991-3993, Vol. 41, No. 8
0095-1137/03/$08.00+0 DOI: 10.1128/JCM.41.8.3991-3993.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
Cat Scratch Disease Presenting as Orbital Abscess and Osteomyelitis
Beloo Mirakhur,1 Samir S. Shah,1,2* Adam J. Ratner,2 Scott M. Goldstein,3,4 Louis M. Bell,1,2 and Jean O. Kim2
Divisions of General Pediatrics,1
Infectious Diseases,2
Department of Ophthalmology, The Children's Hospital of Philadelphia,3
Scheie Eye Institute, Philadelphia, Pennsylvania4
Received 12 November 2002/
Returned for modification 17 March 2003/
Accepted 1 May 2003

ABSTRACT
Ocular manifestations of cat scratch disease are uncommon. The
diagnosis is usually made on the basis of increasing
Bartonella henselae serum antibody titers. We report a child presenting
with orbital abscess and osteomyelitis who was diagnosed with
hepatosplenic cat scratch disease by detection of
B. henselae DNA in the orbital abscess fluid.

CASE REPORT
A 3-year-old girl presented with a fever of up to 40.0°C
and worsening right eyelid edema, erythema, and tenderness.
Shortly after the onset of symptoms, she was evaluated by her
pediatrician and diagnosed with periorbital cellulitis. She
was treated with amoxicillin-clavulanate. Despite oral antibiotics,
her symptoms worsened over a 3-week period and she was taken
to a nearby hospital. Computed tomographic (CT) imaging of her
head revealed a 2-cm mass in the extraconal space of the lateral
orbit with adjacent lytic bony changes (Fig.
1). She was transported
to The Childrens Hospital of Philadelphia for further
management. Her history was significant for multiple scratches
to her face and body from a recently acquired kitten. Her past
medical history was otherwise unremarkable.
On arrival, her examination revealed proptosis of the right
eye with significant periorbital edema, erythema, and tenderness.
There was no pain with extraocular movements, but right-side
gaze was limited. The right eye conjunctiva was mildly injected.
The fundi were normal. There was no lymphadenopathy or hepatosplenomegaly.
The remainder of her physical examination was unremarkable.
Laboratory analyses revealed the following: white blood cell count, 13,100/mm3 (68% segmented neutrophils, 21% lymphocytes, and 7% monocytes); platelets, 560,000/mm3; hemoglobin, 10.8 g/dl. CT of the chest and abdomen, performed to exclude metastatic malignancy, revealed retroperitoneal lymphadenopathy and numerous hypodense liver and spleen lesions (Fig. 2). Bartonella henselae immunoglobulin M (IgM) was 1:20 (reference range, <1:20), and B. henselae IgG was 1:64 (reference range,
1:32). The erythrocyte sedimentation rate (ESR) was 105 mm/h, and the C-reactive protein (CRP) level was 5.43 mg/dl.
The lateral orbital mass was drained of purulent fluid. There
were no other collections. No organisms were seen on Gram stain.
Culture of the aspirated material was negative for aerobic and
anaerobic bacteria, acid-fast bacilli, and fungi. Postoperative
magnetic resonance imaging of the orbit showed posterolateral
irregularity of the bone consistent with orbital osteomyelitis.
Preoperatively, she was treated with ampicillin-sulbactam. Postoperatively,
when specimens of the aspirated fluid were positive for
B. henselae by PCR (Centers for Disease Control and Prevention, Atlanta,
Ga.), she also received rifampin. Her fever resolved on the
seventh day of hospitalization. The ESR and CRP level were 50
mm/h and 1.0 mg/dl, respectively, 3 weeks after drainage and
were normal 5 weeks later. The patient completed a 5-week course
of ampicillin-sulbactam plus rifampin.

Discussion
The differential diagnosis of an orbital mass with bone destruction
includes rhabdomyosarcoma, neuroblastoma, histiocytosis, and
infection. Lymphoma and leukemia can cause an orbital mass but
rarely cause the bony destruction present in this case. Ocular
manifestations of cat scratch disease may include Parinaud oculoglandular
syndrome and neuroretinitis (
3,
4). Other ocular manifestations
are rare. Gaebler et al. reported a 4-year-old child with subacute
orbital abscess in whom the diagnosis of cat scratch disease
was made on the basis of serum antibody titers (
5). Goldstein
et al. diagnosed cat scratch endophthalmitis by PCR in a 45-year-old
man presenting with vitreitis (
6). Our case represents another
atypical ocular manifestation of cat scratch disease. The diagnosis
was confirmed when
B. henselae DNA was identified in the orbital
abscess fluid by PCR. The history of contact with kittens, positive
serology for
B. henselae, and associated hepatosplenic lesions
supported the diagnosis.
Serologic testing for antibodies to B. henselae is the most widely used test for laboratory confirmation of the diagnosis of cat scratch disease. Since the seroprevalence of B. henselae antibodies is 30% in asymptomatic cat owners, the presence of antibodies is not sufficient to make the diagnosis of cat scratch disease, particularly with atypical manifestations (13). The use of a PCR-based assay allows detection of B. henselae-specific DNA sequences (12). The increasing use of PCR-based assays for B. henselae will allow us to fully understand the scope of clinical disease associated with this organism.
The role of antimicrobial therapy in cat scratch disease with ocular involvement is unclear. The combination of rifampin and doxycycline shortened the course of neuroretinitis due to cat scratch disease and hastened the recovery of vision in seven adults (10). Patients with osteomyelitis attributed to cat scratch disease have been successfully treated with erythromycin, azithromycin, rifampin, tetracycline, and gentamicin either alone or in combination (7, 9, 11). In a retrospective review of patients with systemic symptoms related to cat scratch disease, Margileth concluded that rifampin, ciprofloxacin, trimethoprim-sulfamethoxazole, and gentamicin were all potentially effective (8). In one case series, 16 of 19 children with hepatosplenic cat scratch disease had favorable clinical responses to rifampin alone or in combination with gentamicin (1). Patients with regional lymphadenopathy usually do not require therapy although azithromycin has been reported to decrease lymph node volume within the first month after initiation of treatment (2).

FOOTNOTES
* Corresponding author. Mailing address: 2nd floor, Division of General Pediatrics, 34th and Civic Center Blvd., The Children's Hospital of Philadelphia, Philadelphia, PA 19104. Phone: (215) 590-4378. Fax: (215) 590-2180. E-mail:
shahs{at}email.chop.edu.


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Journal of Clinical Microbiology, August 2003, p. 3991-3993, Vol. 41, No. 8
0095-1137/03/$08.00+0 DOI: 10.1128/JCM.41.8.3991-3993.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.
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