Palabras clave: Behçet's disease, neurological involvement, vasculitis

Introduction

Behçet's disease is a vasculitis that causes inflammatory injuries in multiple organs and systems like the skin, joints, gastrointestinal, renal, cardiopulmonary and/or neurological [1].

The larger number of cases on a global scale, has been informed along the so called “Silk Road” that goes from the Mediterranean region up to Japan. It typically appears in the third decade of life, affecting more men than women (1.4:1) with a higher incidence of serious systemic complications in young men [2]. In countries of America the incidence is much lower thus being catalogued as a rare disease [3]. The reported frequency of neurological injuries, ranges between 5 and 13 % and it has been admitted that these injuries increase mortality and morbidity of patients with Behçet´s disease [4],[5].

The diagnosis is based on the following criteria: repetitive oral ulcers generally painful (with a minimum of three relapses in one year), plus two or more of the following signs or symptoms: recurrent genital ulcers, ocular injuries as hypopyon, uveitis, retinal vasculitis, cutaneous injuries and positive pathergy test according to criteria proposed by the International Study Group in 1990 (Table 1) [6]. Recently, these criteria have been revised for presenting low sensibility and new international criteria have been established for Behçet´s disease by means of a ten-point score where a score over four gives the diagnosis. In this score neurological manifestations and vascular manifestations (arterial, venous thrombosis or phlebitis) are added to the previous criteria. Furthermore, if carried out, a positive pathergy test means an additional point [7] (Table 2).

The purpose of this article is to report a case of neuro-Behçet, to review the reported cases so far in Peru, and to identify their common characteristics.

Table 1. Criteria for the diagnosis of Behçet´s disease.

Table 2. Diagnostic score according to the New International Criteria for the Behçet´s disease.

Methods

The design of the present research is a retrospective cross-sectional case report. Informed consent for publication was requested and provided in accordance with international ethical standards. We carried out a search of medical literature regarding reported cases of Neuro-Behçet´s disease in Peru (MeSH: Symptom Complex Triple OR Adamantiades-Behcet Disease OR Behcet Triple Symptom Complex OR Old Silk Route Disease OR Behcet's Syndrome OR Behçet Disease AND Case Report [Publication Type] AND Neurologic Manifestations) in PubMed, Lilacs and Scielo. Six cases were identified in our country [7],[8],[9] with the criteria and the diagnostic score for Behçet´s disease.

Case report

The patient is a 20-year-old woman, from the Constitutional Province of the Callao, with European - Mediterranean descent from both parents and precedent painful ulcerative injuries in lingual mucous membranes, hard palate and lips during the previous three years with a progressive course and spontaneous remission. One year earlier she had an episode of blurry vision, during three or four days, which improved without treatment. Seven months earlier, an episode of previous uveitis in the right eye with spontaneous remission after two days. The following month she had a relapse in the left eye with the same characteristics (Figure 1). Four months earlier, she presented intermittent arthralgia of 8/10 intensity that diminished with analgesic and anti-inflammatory treatment. Two months earlier, the patient showed positional tremor in upper limbs with a duration of three days and spontaneous remission. One month earlier, she presented genital ulcers with spontaneous remission in two weeks without leaving a scar and with recurrence until diagnosis. During this time she refers constipation, which improves with lactulose.

Some weeks before, she went to the emergency department after a sudden vertical diplopia that was not spontaneously improving.

In the physical examination at admission: the patient had a fluent speech, anisocoria (R: 2.5 cm L: 3.5 cm), making it difficult to look down with the left eye, vertical nystagmus, central scotoma and upper eyelid ptosis in the right eye. The ocular fundus showed vitreitis, macular edema and foci of peripheral periphlebitis with right predominance. She also presented painful genital and perianal ulcers of slightly definite borders with a diameter of one to two centimeters (Figure 1).

Figure 1. Clinical signs of the patient.

Antiphospholipid antibodies, antinuclear antibodies, antineutrophil cytoplasm autoantibodies, rheumatoid factor, serum complement, and oligoclonal bands turned out negative (Table 3). Due to the mild protein C and S increase and low sedimentation rate, post infectious encephalopathy and/or rhombencephalitis was suspected. However, we found no indicators of any etiologic agent in the study of cerebrospinal fluid (Table 4).

Table 3. Immune profiling.

Table 4. Cerebrospinal fluid characteristics.

The results of nuclear magnetic resonance (NMR) show hyperintense images in T2-FLAIR in medial region bilateral mesencephalic ranging left area and right hippocampus (figure 2). Visual evoked potentials demonstrated bilateral increased latencies with left predominance.

Figure 2. Images of RMN in considered T2-FLAIR.

We determined that the clinical picture corresponds to an inflammatory disease without infection evidence. The extra neurological symptoms and signs and the characteristic injuries of the central nervous system allowed to exclude other causes of inflammatory injuries as of lupus erythematosus, rheumatoid arthritis, herpes, HIV, syphilis, multiple sclerosis, post-infectious encephalopathy and viral rhombencephalitis.

The oral and genital ulcers with undefined etiology made us suspect Behçet´s disease, hence we requested the pathergy test [7] (Figure 3), which turned out to be negative. Nevertheless, in the biopsy sample of the rim of the ulcer, acute and chronic, superficial and deep inflammatory perivascular and interstitial infiltration were demonstrated, compatible with autoimmune disease (Figure 4).

Figure 3. Pathergy test.

Figure 4. Histological images of skin biopsies showing acute and chronic inflammatory infiltration.

Additionally, the hemogram presented leukocytosis (14,440 cells/mm³) with lymphocytes predominance. Hemoglobin in 9.1 g/dl with transferrin saturation of 7.75 %, ferritin 57 ng/ml and iron of 17.49 mcg/dl. The urine test with leukocytes over 100 per field, positive to Candida Albicans culture as the vaginal secretion test (Table 5).

Table 5. Hematology test and others.

After treating the infections and stabilizing the patient, treatment began with prednisone with a systemic dose of 0.5 mg to 1mg/kg/day that has continued up to today. She has also received treatment for two months with azathioprine with a dose between 1 to 2 mg/kg/day, during which, the patient presented meningoencephalitis of probable bacterial etiology, so we decided to withdraw this treatment. The patient later presents an evolution characterized by recurrent urinal infections, Cushing syndrome, osteopenia and osteoporosis as adverse reactions to the treatment with corticoids. As a consequence, she also present a decrease of visual acuity with right predominance.

Diagnosis according to criteria
The clinical picture of the patient met the major criterion (recurrent oral ulcers) and two of four additional criteria established by the International Study Group in 1990 (genital ulcers and previous uveitis as an ocular injury) [1] (Table 1). The patient also met the new international criteria, established in 2014, for Behçet´s disease, having presented eight of a maximum score of ten. These criteria add to the classic ones: skin injuries (aphthae) and neurological manifestations without vascular manifestations like arterial thrombosis or phlebitis [7] (Table 2).

Identified cases
The reports of Behçet´s disease in Peru are scarce. After the search, we could only identify six cases of Neuro - Behçet in the last 25 years which are described in Table 6.

Table 6. Evidence table.

Discussion

The neurological compromise of Behçet´s disease can be classified as primary by direct affectation of the central or peripheral nervous system; and secondary to systemic complications of the disease or the treatment. Two primary affectations have been established: parenchymal and not parenchymal. Which rarely take place in the same individual [2], and its pathogenesis are probably different, although the most recognized finding is the perivascular lymphocytic infiltrate [10].

The parenchymal damage is characterized by an inflammation of small blood vessels in the parenchyma of the central nervous system. It affects most frequently male patients. Symptoms as ophthalmoparesis, cranial neuropathy, cerebellar damage or pyramidal dysfunction, can indicate affectation of the brain stem. Progressive forms of the disease characterized by subcortical dementia accompanied by ataxia; in addition to signs and symptoms indicative of cerebral hemispheres damage as hemiparesis, convulsion, dysphasia, cognitive dysfunction, psychosis and emotional lability have also been reported. Finally, the disease can also affect the spinal cord [10],[11].

The diagnosis of the Behçet´s disease rarely occurs in our population and it is usually not reported initially in patients with neurological compromise. Although there are reports of Behçet´s disease in Mongolia, Russia, Australia, New Zealand, Brazil, Mexico, Cuba, Argentina, Colombia and Chile, approximately in 200 patients [12], the reports of the Neuro-Behçet´s disease in Peru are scarce. Six cases were identified in the last 25 years, mostly with neurological symptomatology different from that of our patient, with the same proportion of men and women and ages ranging between 16 and 55 years, from urban areas of Lima, but with no specified European or Mediterranean descent (Table 6).

Our patient presented perianal and genital ulcers which are considered to be the most specific injuries of this disease [13]. She also presented uveitis that is seen in 25 to 75 % of patients mostly men. The patient also had a partial paralysis of III right cranial nerve (only eyelid ptosis) and left (pupil dilation), damage of the IV cranial nerve nucleus of the right side (slight medial deviation of the left eye with difficulty for directing the look down and lateral). This is similar to the case reported by Aydin et al. but this case only presented injury in the oculomotor nerve nucleus [14]. Hence, ocular signs can be the initial manifestations that generate main concern in the patient and/or doctor and lead the clinical suspicion to the definitive diagnosis even in absence of other more common clinical symptoms [15]. Despite that our patient fulfills the established diagnostic criteria for Behçet´s disease [1],[7] it presented a negative test of pathergy, which is specific but has low sensitivity, a fact that might increase the value of false negatives in the context of patients receiving any form of anti-inflammatory treatment [6],[7].

Neurological clinical manifestations in our patient appeared with a progressive course of approximately four years, similar period to that of published studies in Asia and Europe [12]. The neurological compromise of the present case was of parenchymal type; as in three published articles in Peru, with a total of six patients diagnosed with neuro-Behçet (Table 6). She did not show severe episodes at diagnosis and received opportune treatment; in contrast with the reported Peruvian case reported Hinostroza et al. [9], in which the diagnosis was late and neurological complications led the patient to deep coma. The neurological clinical manifestations of our patient were different from the reported cases by Barrios et al. [10], which included tonic-clonic convulsions, movement alterations, hemiparesis, Babinski (+) and migraine. Therefore, it is important to consider the neurological symptomatology of Behçet´s disease, especially in its varied clinical presentation, because the injuries might be irreversible and linked with a bad prognosis [16].

The treatment of the Behçet´s disease is based on the use of glucocorticoids in doses that change according to the severity of the presentation, generally, it starts with prednisone (1 mg/kg per day for one month, followed by withdrawal in a gradual form depending of the patient´s tolerance). In serious cases it is useful a treatment with corticoids pulses, as methylprednisolone 1 g, administered intravenously every 24 hours during one to five days [17]. In case of nervous compromise the treatment includes the use of azathioprine as a first line agent, alternatives include mycophenolate, methotrexate, and cyclophosphamide [18]. When there is an ocular compromise, the use of cyclosporine in combination with glucocorticoids is frequent [19] and in serious or resistant cases other immunosuppressants are used as azathioprine [20].

In our patient, the treatment was with corticoids and azathioprine, the result was a recovery of the neurological injuries without relapsing, but with recurrent urinary tract infections and development of Cushing syndrome as side effects of the corticoids. This favorable evolution is not seen in all patients, as it is in the Peruvian case presented by Visaga et al. [8], in which there was a late diagnosis and failure at the end of the treatment with corticoids. The absence of an answer to corticoids is associated with a bad prognosis and with a dependence status [21].

The most complex complication is the blindness caused by bilateral uveitis and scar tissue. Here the traditional use cyclosporine (5mg/kg) is indicated together with the treatment against the tumor necrosis factor alpha when resistance to immunosuppressants is identified [22]. Our patient presented a diagnosis of uveitis in the right eye seven months before diagnosis, a month after she had a recurrence in the left eye and this is the last reported episode.

Conclusion

In conclusion, in patients with neurological symptomatology and injuries, it is necessary to suspect the diagnosis of less frequent etiologies like Behçet´s disease, especially in young people even in populations where this diagnosis is not frequent. It is necessary to consider that the morbimortality of this disease increases when there is neurological damage [23]. Therefore, an early diagnosis is important since it allows an opportune treatment that avoids the development of severe complications and/or disabling sequelae.

Notes

From the editor
The authors originally submitted this article in Spanish and subsequently translated it into English. The Journal has not copyedited this version.

Ethical aspects
The informed consent requested by Medwave has been signed by the patient; A copy of this was sent to the editorial board of the magazine.

Declaration of conflicts of interest
The authors have completed the ICMJE declaration of conflicts of interest form, and declare that they have not received funding for the report; Not having financial relationships with organizations that may have interests in the published article in the past three years; And not having other relationships or activities that could influence the published article. Forms can be requested by contacting the responsible author or the editorial board of the Journal.

Financing
The authors state that there were no external sources of funding.

Table 1. Criteria for the diagnosis of Behçet´s disease.

Table 2. Diagnostic score according to the New International Criteria for the Behçet´s disease.

Figure 1. Clinical signs of the patient.

Table 3. Immune profiling.

Table 4. Cerebrospinal fluid characteristics.

Figure 2. Images of RMN in considered T2-FLAIR.

Figure 3. Pathergy test.

Figure 4. Histological images of skin biopsies showing acute and chronic inflammatory infiltration.

Table 5. Hematology test and others.

Table 6. Evidence table.

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