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IgG4-related disease presenting as panuveitis without scleral involvement
© The Author(s). 2017
Received: 18 January 2017
Accepted: 16 February 2017
Published: 27 February 2017
The following case emphasizes the importance of including IgG4-related disease (RD) in the differential diagnosis of intraocular inflammation and multiple cranial nerve palsies.
A 33-year-old man, with a history of idiopathic bilateral panuveitis, presented with a new right pupillary-sparing partial third nerve palsy, which spontaneously resolved in 2 weeks, but was followed 1 month later, by a right sixth nerve palsy, which also resolved within a few weeks. Motility disturbance was accompanied by a decrease in the central acuity in the right eye. Magnetic resonance imaging/angiography (MRI/MRA) demonstrated a densely enhancing osteodestructive skull base process extending through the cavernous sinus and into the right superior orbital fissure. Biopsy of the lesion was consistent with IgG4-related disease (RD).
This is the first reported case of IgG4-RD associated panuveitis without scleral involvement, expanding the list of clinical manifestations of the IgG4-RD.
A 33-year-old man, with a history of bilateral idiopathic panuveitis for the past 6 years, presented with a new onset of binocular oblique diplopia and right ptosis. He was previously treated with several immunomodulators, including cyclosporine, mycophenolate mofetil, azathioprine, and methotrexate. These agents had failed in controlling his active panuveitis, and he had been receiving adalimumab infusions every 2 weeks for the past 2 years.
On initial presentation, central acuity was 20/30 in each eye; extraocular motility testing demonstrated no adduction and severely restricted supraduction in the right eye, along with almost complete right-sided ptosis. Patient was diagnosed with a right pupillary-sparing partial third nerve palsy. Biomicroscopic examination revealed bilateral mild to moderate (1/2-1+) anterior uveitis with a few anterior vitreous cells but no posterior vitritis. Fundoscopy was grossly normal.
A month later, the patient started noticing diplopia again; there was complete absence of right abduction on exam compatible with a sixth nerve palsy. Central visual acuity in the right eye had deteriorated to counting fingers. There was a right RAPD, but no abnormalities on fundoscopy were noted.
CT scan of the chest, abdomen, and pelvis was obtained and was reported as normal. Multiple blood tests (complete blood count, erythrocyte sedimentation rate, C-reactive protein, antinuclear antibodies, syphilis screening, angiotensin-converting enzyme, and tuberculosis purified protein derivative skin testing) were all normal as well.
One month after the biopsy was performed, visual acuity spontaneously improved to 20/40 on the right. Motility deficits had all resolved and fundoscopy remained normal. There was a mild anterior uveitis with a few anterior vitreous cells and no posterior vitritis in either eye.
As the patient recovered spontaneously and has not had any future relapses, no treatment was initiated and he has been followed with observation only. The panuveitis has remained controlled with topical steroid drops over the past 2 years, after the initial presentation.
To our knowledge, this is the first reported case of panuveitis without scleral involvement associated with IgG4-RD.
IgG4-RD is an emerging entity that has been described and reported on extensively in the recent years. It is characterized by tumefactive lesions, dense lymphoplasmacytic infiltrate abundant in IgG4-positive plasma cells, and fibrosis with typical storiform pattern and obliterative phlebitis, although the latter is only intermittently observed, depending on the affected organs [4, 5]. The disease was originally described in 2001 in a cohort of Japanese patients presenting with autoimmune pancreatitis and a raised serum IgG4 level [2, 3]. Since then, it has been described in nearly all organs, including the lungs, liver, kidney, and thyroid [4, 6–9].
Diagnostic criteria for IgG4-RD are still incompletely defined. An international consensus statement  had suggested three different levels of diagnostic classification for IgG4-RD: histologically highly suggestive of IgG4-RD, probable histologic features of IgG-RD, or insufficient histologic evidence of IgG4-RD. Other classifications  have attempted to include the serum IgG4 levels in the diagnostic criteria, but the serum levels can be normal in as much as 30–40% of patients (as they were in our case) with IgG4-RD thus rendering this diagnostic tool unsupportive in this cluster of patients [5, 12].
From an ophthalmological point of view, IgG4-RD most often affects the orbit or lacrimal gland [4, 9, 13]. A Japanese study reviewed 65 cases with IgG4-related ophthalmic diseases (ROD)  and reported 31 cases (57.7%) that had only lacrimal gland involvement, with the remaining 34 cases (52.3%) involving ocular adnexa: trigeminal nerve, extraocular muscles, orbit, eyelid and nasolacrimal duct . Rare cases of conjunctival, scleral, and optic nerve involvement have also been reported [7, 15, 16].
Nearly half of the patients presenting with ocular IgG4-related ophthalmic disease will also have extraocular manifestations in other organs, and it is suggested that all patients should be evaluated for the salivary gland enlargement, lymphadenopathy, and lung, liver, and renal involvement . Whole-body fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) is a valuable imaging study to assess for the extraocular manifestations of the disease .
In the past few years, associations between granulomatous diseases, such as sarcoidosis, adult orbital xanthogranuloma and granulomatosis with polyangiitis, and IgG4-RD have been described [15, 18–21]. These cases demonstrate a possible overlap between these two conditions, although this is still not clearly understood. Interestingly, lymphoma has been associated with IgG4-RD and the latter seems to increase the risk of lymphoma [17, 22–24]. Therefore, granulomatous disease and lymphoma should be considered in the differential of IgG4-RD. In the case presented here, both entities were initially considered but it was erroneously presumed that they were related to adalimumab use and not directly to IgG4-RD.
There is no clear consensus on the treatment of IgG4-RD. Spontaneous resolution has been described in the literature  and in our case, although the skull base lesion has remained unchanged, with the exception of mild panuveitis, the disease remained quiescent without treatment. Recurrence, however, is possible at any point in time. Corticosteroids are the first line of treatment and have been shown to be effective in treating the disease, although the relapse rate can be higher in patients treated with steroids . Steroid-sparing agents have also been used successfully in treating IgG4 with rituximab (anti-CD20 monoclonal antibody) being the most successful. Dramatic responses to this anti-CD20 monoclonal antibody have been reported in the first month of treatment [27, 28]. Treatment with rituximab was suggested for our patient but, since he has remained largely asymptomatic, it was not used. Low-dose radiotherapy has also been described with variable response [17, 29].
Our report emphasizes the importance of keeping IgG4-RD in the list of differential diagnosis for patients with panuveitis and especially for patients presenting with panuveitis and eye motility abnormalities as these combinations of clinical findings are difficult to explain by a single pathological entity otherwise.
No funding was received for this work.
The conception and design, acquisition of data, analysis and interpretation of data, and drafting and revising of the manuscript were done by KN, LD-D, and EM. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
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