Introduction: Macrophage activation syndrome (MAS) and pulmonary arterial hypertension (PAH) are rare and life-threatening complications of adult-onset Still disease (AOSD).Patient concerns: We reported an interesting case of a 25-year-old AOSD patient with MAS and PAH, and the patient was found to have right anomalous pulmonary venous connection accompanied by an atrial septal defect.Diagnosis: MAS was diagnosed as a complication of AOSD. PAH was contributed probably by right anomalous pulmonary venous connection.
Interventions:The patient dramatically improved with methylprednisolone (80 mg I.V. daily) plus supportive treatments, without interleukin (IL) inhibitors or ciclosporin A given.Outcomes: The patient's serum hepatic enzyme levels dropped and hemocytes rose within 1 week.
Conclusion:Other causes need to be excluded carefully before giving a diagnosis of PAH with AOSD. Early diagnosis and aggressive treatments are pivotal to improve the quality of life and the survival of patients. Abbreviations: ALT = alanine transaminase, AOSD = adult-onset Still disease, AST = aspartate transaminase, CRP = C-reactive protein, CTA = computed tomography angiography, CTDs = connective tissue diseases, ESR = erythrocyte sedimentation rate, Hb = hemoglobin, IL = interleukin, INF = interferon, LDH = lactate dehydrogenase, MAS = macrophage activation syndrome, NK = natural killer, PAH = pulmonary arterial hypertension, RBC = red blood cell, TG = triglyceride, TNF = tumor necrosis factor, WBC = white blood cell.