Background

Kawasaki disease (KD) is one of the most common vasculitis disorders of childhood [1]. Although it is a multisystem disease that mainly affects the coronary arteries, it can, rarely, present with unusual system involvement of the pulmonary system, gastrointestinal tract, central nervous system, and genitourinary system [1]. Here, we report the case of a patient with KD who presented with an unusual form of pleural effusion. We also present a literature review on the subject.

Case presentation

A 7-year-old Turkish girl presented to a local hospital with fever, chest pain, and vomiting. At hospital admission, she was febrile with a respiratory rate of 50 per minute. On physical examination, auscultation of her lungs revealed diminished breath sounds of the lower lobe of her left lung. An anteroposterior (AP) chest X-ray and chest ultrasonography showed a left lower lobar consolidation with minimal pleural effusion. She was hospitalized and sulbactam ampicillin (SAM), ceftriaxone, and clarithromycin were initiated. On the third day, her condition worsened with increasing pleural effusion (Fig. 1). Thoracentesis was performed. SAM and ceftriaxone treatments were discontinued and meropenem and vancomycin were started. A chest tube was inserted and 130 mL of pus was drained. Light’s criteria were positive for an exudative pleural effusion; a pleural fluid culture was sterile. After 4 days, the chest tube was removed. High fever persisted for 15 days despite broad spectrum antibiotics, and acute-phase reactants remained high; therefore, she was referred to our hospital for further evaluation.

Fig. 1
figure 1

Chest X-ray of the patient showing left lower lobar consolidation with pleural effusion

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She had a fever with a temperature of 38.1 °C, her respiratory rate was 48/minute, heart rate was 125/minute, blood pressure was 90/65 mm Hg, and oxygen saturation was 95%. A physical examination revealed non-purulent conjunctivitis in both eyes, perianal peeling, and periungual desquamation on her hand, fingers, and toes. All other findings in the physical examination were unremarkable. She had unilateral cervical lymphadenopathy and a rash on her extremities while in the other hospital. Her past medical history was unremarkable, as was her family history. Immunizations were up-to-date for her age.

On admission to our hospital, the laboratory findings were as follows: hemoglobin 10.2 g/dL, white blood cells 14,000/μL, and platelets 736,000/μL. C-reactive protein (CRP) was 4.26 mg/dL (normal, 0–0.8 mg/dL), the erythrocyte sedimentation rate (ESR) was 42 mm/hour (normal, 0–20 mm/hour), and the albumin, creatinine, aspartate aminotransferase, alanine aminotransferase, gamma glutamyl transferase, blood urea nitrogen, calcium, sodium, chloride, and potassium levels were normal. Urine analysis was normal.

A chest X-ray was normal. Perivascular brightness and echogenicity of her right coronary artery was noted on transthoracic echocardiography (TTE). She was diagnosed as having KD based on the presence of fever, bilateral non-purulent conjunctivitis, cervical adenopathy, perianal peeling, periungual desquamation, elevated acute-phase reactants (ESR, CRP), thrombocytosis, and coronary artery involvement (CAI). Intravenous immunoglobulin (IVIG) (2 g/kg, infusion in 12 hours) and acetylsalicylic acid (60 mg/kg per day) were initiated. The fever resolved after IVIG infusion. At a 3-month follow-up visit, the acute-phase reactants and a TTE were normal. One year after the diagnosis, a TTE was normal and she was perfectly healthy.

Discussion and conclusion

The most important complication of KD is CAI, which leads to enlargement, aneurysm, ischemic heart disease, and sudden death [1]. The clinical course of KD is highly variable. There are no pathognomonic clinical or laboratory findings to help diagnose KD. The diagnosis of KD in this case was made using the criteria of the American Heart Association [1]. In the presence of at least 5 days of fever, if there are at least four of the five principal criteria (cervical adenopathy, bilateral non-purulent conjunctivitis, oropharyngeal mucosal changes, polymorphous rash, erythema of the palms or soles, and edema of the hands or feet) the patient is diagnosed as having KD [1].

KD may present with uncommon symptoms such as pneumonia, pleural effusion, diarrhea, vomiting, sterile pyuria, gallbladder hydrops, acute cholestatic hepatitis, arthritis, and aseptic meningitis [2,3,4,5,6,7]. Pulmonary system involvement of KD is very rare; KD can present as pneumonia, pulmonary nodules, bronchopneumonia, hydropneumothorax, and pleural effusion [6, 8, 9]. Singh et al. showed that 1.3% of patients had pulmonary involvement and pleural effusion was seen in 54.5% of these patients [6]. Ugi et al. reported the case of an adult patient who presented with pulmonary involvement, specifically bilateral massive pleural effusions [10]. Occasionally, pleural effusion may be associated with bacterial agents such as Mycoplasma pneumoniae and Streptococcus [11, 12]. Pulmonary symptoms are mostly initially treated with antibiotics. However, if fever and accompanying signs ensue, the diagnosis of KD should be considered. Patients with pulmonary involvement may be more likely to have CAI due to delays in diagnosing KD and administration of IVIG [12,13,14,15,16,17].

We performed a review of the literature using PubMed and the search terms: Kawasaki disease AND pulmonary involvement; OR Kawasaki disease AND pulmonary presentation; OR Kawasaki disease AND pleural effusion. The searches were limited to the English language and pediatric patients. Case series and single case reports involving pediatric patients with KD with pulmonary involvement were included. Inconsistencies were resolved through discussion with the author SO, who also reviewed the literature. The authors EAA and OA searched the literature and manually screened titles and abstracts for relevance. Inconsistencies were resolved through discussion with the author SO.

Figure 2 lists the schematic analyses of the systematic literature review. At first, 25 related articles were found, but nine articles were excluded because of duplication, non-English language, and adult age, which left 16 articles [6, 8, 11,12,13,14,15,16,17,18,19,20,21,22,23,24]. The characteristics of these patients are summarized in Tables 1, 2, and 3. Finally, 20 patients with pleural effusions due to KD were identified [6, 11,12,13,14,15,16,17,18, 20, 24]. Of the 20 reviewed patients, TTE results were available in nine patients and seven had CAI [6, 12,13,14,15,16,17, 24]. Eleven patients presented with respiratory symptoms such as cough, dyspnea, and tachypnea [6, 12,13,14,15, 20]. Only four patients [14, 17, 18, 24] had complete KD, 10 patients [6, 13, 15, 16, 20] had incomplete KD, and six patients’ [11, 12] presentations were not available. Although a definite infectious agent could be shown for two patients [18, 24], all of the patients received antibiotics except one [14]. Two patients [6, 17] received a second dose of IVIG, and five patients received a second dose of IVIG and corticosteroid treatment for KD [13,14,15,16, 18].

Fig. 2
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Study flowchart

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Table 1 Clinical symptoms and laboratory parameters of patients who had pulmonary involvement associated with Kawasaki disease
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Table 2 Demographic parameters and clinical presentations of patients who had pulmonary involvement associated with Kawasaki disease
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Table 3 Treatment, coronary artery involvement, follow-up, and outcomes of patients who had pulmonary involvement associated with Kawasaki disease
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In this case, our patient initially had an exudative, noninfectious pleural effusion and no response to antibiotics. CAI was also noticed and IVIG was administered on the 15th day of fever. After IVIG treatment, our patient’s clinical and laboratory findings improved dramatically, and the fever and acute-phase reactants returned to normal. It remains unclear as to whether the KD was triggered by the infection of the pleural space or if the pulmonary finding was a feature of the inflammation of KD.

KD can affect various systems as well as the coronary arteries, and may present with an unusual clinical picture. The diagnosis of KD with atypical presentations may be difficult for pediatricians. Early diagnosis and treatment can prevent complications.