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A Diagnostic Challenge: the Child with Fever, Rash, and Arthritis

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A Diagnostic Challenge: the Child with Fever, Rash, and Arthritis BRIEF REPORTS J Am Board Fam Pract: first published as 10.3122/jabfm.9.2.114 on 1 March 1996. Downloaded from A Diagnostic Challenge: The Child with Fever, Rash, and Arthritis Peter G. Danis, MD, and Tessa D. Gardner, MD When a child has a fever, rash, and joint pain, the ing, semicoalescent rash on his inner thighs. family physician needs to consider a variety of Laboratory evaluation that day included an anti­ diseases in the differential diagnosis. Juvenile streptolysin titer of 578 IU/mL and white cell rheumatoid arthritis, Lyme disease, and strepto­ count 16,900/pL with 70 percent granulocytes. coccal diseases are all possible causes of this triad On the day of admission he had an acute onset of symptoms. An accurate diagnosis, however, of swelling of the right ankle. His temperature might be delayed until serologic studies have was 101.0°F, heart rate 120 beats per minute, res­ been returned and the response of the child to piratory rate 20/min, and blood pressure 90/60 treatment has been observed. mmHg. He had a tender erythematous area over­ lying the right medial malleolus, which was sur­ Case Report rounded by moderate soft tissue swelling ex­ A 5-year-old boy was admitted to the hospital in tending 3 to 4 cm in all directions around the May with a 12-day history of intermittent fever, malleolus. There was no palpable synovial thick­ rash, and arthralgias. The child's illness began 12 ening, and there were no palpable subcutaneous days before admission, at which time he had a nodules. temperature of 103.0°F and no other associated His parents reported no history of any upper symptoms. The fever resolved spontaneously respiratory tract infection or exposure to strepto­ within 24 hours. Nine days before admission he coccal disease, and the family members had had developed an intermittent, erythematous, macu­ no recent illnesses, including streptococcal infec­ lar, lacy non pruritic rash on both thighs. Eight tions. Although the child had no recent history of http://www.jabfm.org/ days before admission he had onset of mild inter­ a tick bite, he had spent time in the past year at his mittent arthralgias involving his knees, hips, and grandfather's farm in Franklin, Mo, an area where wrists, as well as popping of his knees and inter­ Lyme disease had been reported. He had no his­ mittent limping. Three days before admission his tory of joint problems or recent trauma. fever recurred (l01.0°F). Two days before admis­ Admitting laboratory results were white cell sion he was seen by a physician and had a tem­ 'count 17,800/pL with 73 percent granulocytes, 23 perature of 100.0°F, normal findings on a physical percent lymphocytes, 2 percent monocytes, and 2 on 2 October 2021 by guest. Protected copyright. examination, a white cell count of 23 ,OOO/pL with percent eosinophils; hemoglobin 10.7 g/dL, and 80 percent granulocytes, and an erythrocyte sedi­ hematocrit 31.3 percent; C-reactive protein 2.9 mentation rate of 55 mmIh. The following day on mg/dL; an erythrocyte sedimentation rate of reexamination, he had a temperature of 98.2°F, a 38 mmlh; and an antistreptolysin titer of 596 new grade 116 systolic ejection murmur, and a IU/mL. Blood was sent to a reference laboratory macular, erythematous, O.5-cm diameter, blanch- to test for Lyme antibody and hidden rheumatoid factor. A bone scan obtained the day after admis­ sion showed mild increased perfusion of the right Submitted, revised, 11 December 1995. lower extremity without evidence of focal osteo­ From the Department of Family Medicine (PGD) and the myelitis or arthritis. Electrocardiograms on admis­ Division of Pediatric Infectious Diseases (TDG), St. John's sion and on the 3rd hospital day were normal with Mercy Medical Center, St. Louis, Missouri. Address reprint re­ quests to Peter G. Danis, MD, Department of Family Medicine, no evidence of heart block. An echocardiogram on 615 South New Ballas Road, St. Louis, MO 63141. the 3rd hospital day was normal, without evidence 114 JABFP March-April 1996 Vol. 9 No.2 of pericardial effusion or valvular insufficiency. Discussion J Am Board Fam Pract: first published as 10.3122/jabfm.9.2.114 on 1 March 1996. Downloaded from Blood cultures were reported negative at 72 hours. This 5-year-old boy with fever, rash, and arthritis 'Intravenous penicillin G and ceftriaxone were initially had symptoms and signs compatible with prescribed on admission. The patient's rash, several different diseases, including rheumatic fever, and medial malleolar swelling rapidly im­ fever, systemic juvenile rheumatoid arthritis, re­ proved with antibiotic therapy. When discharged cent streptococcal infection with osteomyelitis or 3 days after admission, the child was afebrile, the septic arthritis, and Lyme disease. Initial treat­ rash had resolved completely, and the ankle ment included a broad-spectrum antibiotic to ad­ showed only minimal swelling and no redness or dress these possibilities. tenderness. He had not been prescribed any as­ Osteomyelitis and septic arthritis were eventu­ pirin, acetaminophen, or ibuprofen during hospi­ ally excluded by the two negative bone scans. Be­ talization. He was prescribed intravenous ceftri­ cause of the impressive erythema, tenderness, and axone to be administered at home. swelling of the right medial malleolus, and be­ Findings on repeat bone scan obtained 2 days cause bone scans can occasionally be falsely nega­ after discharge (5 days after the initial scan) were tive in children with early osteomyelitis, a second normal, and the intravenous ceftriaxone was dis'" bone scan was ordered. continued; the child was prescribed oral amoxi­ Acute rheumatic fever was considered a possi­ cillin-clavulanate at 40 mg/kg/d. Eleven days af­ bility; therefore, penicillin G was also included in ter hospitalization the child's white cell count had the initial antibiotic regimen. Although there was decreased to 14,500/pL, and his C-reactive pro­ serologic evidence of a recent streptococcal infec­ tein had returned to normal (0.5 mg/dL), but the tion, it was not sufficient for the diagnosis of antistreptolysin titer was still elevated at 883 rheumatic fever based upon the revised Jones cri­ IU/mL. Repeat serologic tests for Lyme disease teria. I The only major criterion that the child's antibodies and hidden rheumatoid factor were or­ condition satisfied was rash, and his rash did not dered. Sixteen days after admission, the child had have the characteristic appearance of erythema only minimal swelling of the medial malleolus marginatum. In addition, there was no evidence and no evidence of any pain. Results of the first of carditis, chorea, or subcutaneous nodules. Al­ hidden rheumatoid factor test were reported pos­ though the child had impressive monoarticular itive at a titer of 1:128 (normal < 1:16). Results of arthritis, there was no evidence of polyarthritis. the admission Lyme disease serologic test, done The child's condition satisfied three minor crite­ by enzyme-linked immunosorbent assay at the ria-fever, arthralgias, and elevated acute-phase http://www.jabfm.org/ Laboratory for the Diagnosis of Lyme Disease, reactants (erythrocyte sedimentation rate and State University of New York, Stony Brook, were C-reactive protein), and had supporting evidence positive (optical density of patient sample 0.195, of antecedent group A 6-hemolytic streptococcal and reactive cutoff> 0.137). infection (elevated antistreptolysin titer). The Twenty-eight days after admission, results of revised Jones criteria for the diagnosis of an initial the second serologic test for Lyme disease were episode of acute rheumatic fever require the pres­ reported positive at 0.267 (positive> 0.097). The ence of either two major or one major and two on 2 October 2021 by guest. Protected copyright. child completed 6 weeks of total antibiotic therapy minor criteria, as well as evidence of an antece­ consisting of the initial 6 days of intravenous cef­ dent streptococcal infection. Another fact ruling triaxone, followed by 3 weeks of oral amoxicillin­ against the diagnosis of acute rheumatic fever was clavulanate, then 2 weeks of oral amoxicillin. the child's clinical improvement without the use Forty-four days after admission, results of the of aspirin. second hidden rheumatoid factor test were re­ The diagnosis of systemic juvenile arthritis was ported negative. Seven weeks after admission the considered less likely because of the child's rapid child was again examined, and the findings were clinical response to antibiotic therapy in the ab­ normal. Results of the repeat serologic test for sence of salicylates and the subsequent negative Lyme disease showed the titers had decreased to test result for hidden rheumatoid factor. Tran­ 0.87 (positive> 0.101). One year after the hospi­ siently positive hidden rheumatoid factors have talization, the child was doing well without recur­ been reported early in the course of Lyme disease. rence of any joint problems. The immunoglobulin M response to the spiro- Child with Fever, Rash, and Arthritis 115 chete Borrelia burgdoiferi can be associated with a causes, including European erythema migrans J Am Board Fam Pract: first published as 10.3122/jabfm.9.2.114 on 1 March 1996. Downloaded from polyclonal activation ofB cells, which can result in skin lesions.3,5 As the multisystem involvement of slightly elevated levels of rheumatoid factor. 2 Lyme arthritis, including dermatologic, cardiac, This child's clinical appearance of fever, arth­ neurologic, arthritic, and ocular manifestations of ralgias, rash, and monoarticular arthritis was the infection, became apparent, it later became compatible with disseminated Lyme disease. He known as Lyme disease. I2 had a temperature of up to 103.0°F; fever and Although the characteristic history of ixodid other constitutional symptoms are common in bite followed by an erythema migrans skin rash at early localized and disseminated Lyme disease.3,4 the bite site frequently allows the rapid clinical Our patient had a macular, evanescent rash simi­ diagnosis of Lyme disease, the diagnosis is much lar in description to that reported in some cases of more difficult in patients lacking this history.
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