Background IgG4-related disease (IgG4-RD) includes a group of immune-mediated diseases histologically characterized by lymphoplasmacytic infiltrate with a prevalence of IgG4-positive plasma cells, storiform fibrosis and obliterative phlebitis. Autoimmune pancreatitis, sialadenitis, dacryoadenitis and retroperitoneal fibrosis are the most frequent manifestations. IgG4-related sialadenitis usually affects submandibular glands and is very rare in children. Here we report the case of IgG4-related sialadenitis in a six-year-old patient previously diagnosed as juvenile recurrent parotitis. Case presentation A six-year-old patient was referred to our Centre for left parotid swelling of 4 × 3 cm, that was tender, soft in consistency, with overlying red and warm skin. His general condition was good but he was subfebrile; general examination revealed mild enlargement of left cervical lymph nodes. In the last 2 years he had had five episodes of parotitis, diagnosed by another pediatric Center as juvenile recurrent parotitis. On ultrasound examination the left parotid gland appeared enlarged, inhomogeneous, with a colliquative intraparotid lymph node and no evidence of sialolithiasis. Laboratory tests showed an increase of white blood cells and anti-VCA IgM and IgG positivity, with anti-EBNA e anti-EA I negativity. The patient was initially treated with oral antibiotics, but after 10 days the parotid became fluctuating, requiring surgical biopsy and drainage. Postoperative course was regular, with complete remission under oral antibiotic and steroid therapy. Microbiological tests, including cultures for aerobic and anaerobic bacteria, mycobacteria and Bartonella, were negative. Surprisingly, histology showed marked fibrosis and histiocytic and lymphoplasmacellular infiltrate with polyclonal plasma cells mostly expressing IgG4 immunoglobulins. Thus, the diagnosis of IgG4 related chronic sialadenitis in recurrent parotitis and recent EBV infection was made. Conclusions IgG4-related sialadenitis is very unusual in children. Histology plays a key role in diagnosis, considering that up to 30% of patients have normal serum IgG4 levels, as shown in our case. The lack of previous histological data makes it impossible to attribute our patient’s previous episodes of parotitis to IgG4-RD, though it is a very consistent possibility.
BackgroundIgG4-related diseases are a group of immune-mediated diseases characterized by a lymphoplasmacytic infiltrate with a prevalence of IgG4-positive plasma cells, storiform fibrosis, obliterative phlebitis. Autoimmune pancreatitis, sialadenitis, dacryoadenitis and retroperitoneal fibrosis are the most frequent manifestations. IgG4-related sialadenitis usually affects submandibular glands and is very rare in children. We report here a case of an unexpected diagnosis of IgG4-related sialoadenitis in a boy previously diagnosed as affected by juvenile recurrent parotitis.Case presentationA six-year old boy presented to our centre with left parotid swelling about 4x3 cm, tender, soft in consistency, with the overlying skin red and warm. He had low-grade fever and a mild enlargement of left cervical lymph nodes. In the last two years he had five episodes of parotitis and a diagnosis of juvenile recurrent parotitis.. The general conditions were good, and the remainder of the physical examination was normal. At the ultrasonography left parotid was enlarged, inhomogeneous, with a colliquated intraparotid lymph node and no evidence of sialolithiasis. Laboratory tests were normal, except for an increase of white blood cells and positivity for IgM and IgG anti-VCA, with anti-EBNA e anti-EA I negative. The patient was treated with cephalosporins and azitromycin, but after 10 days the parotid became fluctuating and the patient underwent to drainage and biopsy of the gland. He was discharged after 3 days of observation, without any complications, and treated with a further course of cefpodoxime and betametasone, with a good clinical response.Investigations for aerobic and anaerobic bacteria, mycobacteria and Bartonella on the pus were negative. Histology showed marked fibrosis and histiocytic and lymphoplasmacellular infiltration. The plasma cells were polyclonal and mostly expressed IgG4 subclass immunoglobulins. The final diagnosis was chronic sclerosing sialadenitis IgG4-related in recurrent parotitis and recent EBV infection. ConclusionsThe interest of this case comes from the rarity of IgG4-related sialadenitis in children. It is not possible to argue with certainty that the previous episodes of parotitis were manifestations of a IgG4-related disease, due to the lack of histological data. Serum IgG4 in our patient were normal, as described in literature in 30% of cases.
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