Three Cases of Bronchial Asthma Preceding IgG4-Related Autoimmune Pancreatitis

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  • Ito Satoru
    Department of Respiratory Medicine, Nagoya University Graduate School of Medicine
  • Ko Shigeru B.H.
    Department of Gastroenterology, Nagoya University Graduate School of Medicine
  • Morioka Masataka
    Department of Respiratory Medicine, Nagoya University Graduate School of Medicine
  • Imaizumi Kazuyoshi
    Department of Respiratory Medicine, Nagoya University Graduate School of Medicine
  • Kondo Masashi
    Department of Respiratory Medicine, Nagoya University Graduate School of Medicine
  • Mizuno Nobumasa
    Department of Gastroenterology, Aichi Cancer Center Hospital
  • Hasegawa Yoshinori
    Department of Respiratory Medicine, Nagoya University Graduate School of Medicine

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Abstract

Background: Autoimmune pancreatitis is characterized by diffuse swelling of the pancreas and a high serum immunoglobulin (Ig) G4 concentration. Histopathologically, dense infiltration of lymphocytes and IgG4-positive plasma cells with fibrosis are seen in the pancreas. Although allergic diseases complicating autoimmune pancreatitis have been reported, the clinical features of bronchial asthma complicated by autoimmune pancreatitis remain unclear.<br> Case Summary: We report three cases of bronchial asthma preceding the onset of type 1 autoimmune pancreatitis by 3 months to 30 years. All three cases were males with high serum IgG, IgG4, and IgE concentrations. The radioallergosorbent tests were positive for common allergens such as mites and house dust. One case had a pulmonary manifestation that proved to be an inflammatory pseudotumor of the lung with an accumulation of IgG4-positive plasma cells. The asthma symptom was ameliorated by oral prednisolone therapy for autoimmune pancreatitis, and when the corticosteroid doses were reduced, asthma became worse in all three cases.<br> Discussion: It is possible that atopy and increased Th2 cell activity are related to a higher coincidence of IgG4-related diseases such as type 1 autoimmune pancreatitis. Because the present cases are few in number, further studies are necessary.<br>

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