Catastrophic antiphospholipid syndrome (Asherson’s syndrome) caused by a suspected intestinal neuroendocrine tumor: a case report

Background. Every year, the number of people with rare forms of the disease is increasing worldwide. One of these is the catastrophic antiphospholipid syndrome — Asherson’s syndrome. To date, it is being actively studied, but the pathophysiological mechanisms of its development have not yet been fully investigated. Our work is the first attempt to describe Asherson’s syndrome on the example of a clinical case in Ukraine. Objective: to determine the factors and mechanisms that  led to the death of a patient with Asherson’s syndrome in Ukraine. Materials and methods. The structural-logical analysis and the clinical-statistical method were used. Results. Based  on  clinical  and  laboratory  criteria,  our  medical  team  established  a  clinical  diagnosis  of  systemic  lupus erythematosus  complicated  by  a  catastrophic  antiphospholipid  syndrome  (CAPS).  Despite  treatment  with glucocorticoids  and  anticoagulants  according  to  international  guidelines,  the  patient  died.  The  autopsy  results showed that the immediate cause of death was a large blood clot that blocked the pulmonary artery and its main branches. Histological examination revealed thrombosis of small vessels of the kidneys and brain; a neuroendocrine tumor  (G2;  pT3pNxpM1b)  of  the  small  intestine  with  metastases  to  the  liver,  brain,  myocardium  and  kidneys was  suspected.  An  additional  immunohistochemical  study  was  performed  to  clarify  the  histological  diagnosis. The  morphological  picture  and  results  of  immunohistochemical  study  mostly  correspond  to  the  moderately differentiated (G2) non-keratinizing squamous cell carcinoma (ICD-O code: 8070/3) with damage to the walls of the small intestine, liver, lungs, kidneys, myocardium and brain. Conclusions. These data emphasize that despite the rarity of Asherson’s syndrome,  it  is always necessary to consider  its probability  in the presence of signs of multiple thrombosis and multiple organ failure. Because its development is the result of serious diseases, including connective tissue diseases, malignancies,  infections,  the etiotropic and pathogenetic treatment can prevent the development of CAPS and death.


Introduction
The term "catastrophic antiphospholipid syndrome" (CAPS) was first described and introduced into medical terminology in 1992 by R. Asherson [1]. CAPS or Asherson's syndrome is the most severe variant of the antiphospholipid syndrome (APS) and is characterized by multiple thromboses and multiple organ failure with poor outcomes and a high rate of mortality. Approximately 1 % of patients with classic APS develop CAPS, but with 37-50 % of fatal outcomes [2,3,6,19]. In 2000, the international registry of patients with CAPS was created to investigate and develop clinical approaches and therapeutic guidelines in this condition [4]. Since 1992, it has been described approximately 500 cases of CAPS [5,20], but there are no literature data about the registration of CAPS in Ukraine.
A precipitating factor of CAPS can be established in 50-65 % of patients, and the most frequent is infection. In 10-16 % of cases, CAPS is caused by malignancy [3,5,6,19]. In this article, we described a clinical case of Asherson with complaints of numbness and weakness in the right side of the face, right arm, pronounced general weakness, shakiness when walking, cough. Previous medical history: in 2012, a hysterectomy was performed for cervical cancer, followed by radiotherapy and chemotherapy. A month before her current admission, the patient took a course of antibiotics due to pneumonia, but cough and weakness have continued to bother. Physical examination revealed body temperature 38.5 0C, acrocyanosis, swelling of the right lower limb, arterial pressure 90/60 mmHg, heart rate 100 bpm, rhythmic pulse, dullness to percussion in basal parts of the lungs, bilaterally decreased breath sounds. Neurological examination revealed horizontal nystagmus, tongue deviation to the right, bilateral ataxia.
Initial laboratory investigations showed mild normocytic normochromic anemia, elevated erythrocyte sedimentation rate and C-reactive protein, a decrease in urine density. Coagulogram (fibrinogen, prothrombin time and index, thrombin time, international normalized ratio) was normal. Electrocardiography showed sinus tachycardia with signs of P-pulmonale, short PQ syndrome. The deep venous thrombosis was excluded by duplex ultrasound of the lower extremities.
Computed tomography (CT) scan of the brain revealed small hyperdense inclusions of up to 3 mm in the frontoparietal regions of the brain. CT of the chest organs showed right atrial thrombus, pulmonary thrombosis, areas of lung tissue consolidation of 21 × 36 mm in the S2 of the right lung (probably due to pulmonary embolism), liquid in the left pleural cavity and pericardial cavity, mediastinal lymphadenopathy. CT scan of the abdominal cavity, retroperitoneal space, and pelvis revealed multiple hypodense multifocal changes of up to 22 mm in the liver parenchyma, multiple multifocal changes in the spleen, multiple wedge-shaped perfusion defects in both kidneys, small amount of liquid in the retrovesical space, absence of uterus, supravesical lymphadenopathy ( Fig. 1).
Magnetic resonance imaging of the brain revealed multiple irregular foci with fuzzy contours ranging from 3-6 to 9-12 mm in the cortical-subcortical regions of the left frontal, parietal, occipital, right frontal, and parietal lobes of the brain, in the left hemisphere of the cerebellum.
Due to the suspicion of systemic connective tissue disease and antiphospholipid syndrome, the patient was transferred to the therapeutic department for further examination and treatment under the supervision of the staff of the Department of Internal Medicine No. 1 of Bogomolets National Medical University (Kyiv, Ukraine). Additional laboratory investigations showed highly positive antinuclear antibodies (1 : 3200) and positive lupus anticoagulant (antiphospholipid antibodies). Based on previous medical history, current clinical picture, additional investigations data, as well as using SLICC [7] and CAPS criteria [8,9], the clinical diagnosis of systemic lupus erythematosus (SLE) complicated by probable catastrophic antiphospholipid syndrome was made, but at the same time, the risk of recurrent cervical cancer with multiple metastases was not excluded. The treatment with glucocorticoids, parenteral anticoagulants (heparin), and then oral anticoagulants (warfarin) in appropriate and recommended doses was initiated under the control of the relevant indicators Клінічний випадок / Case Report of coagulogram [10,11]. Within several days after the start of treatment, the patient noted a slight improvement in her condition, a decrease in temperature. But over the next 8 days, the woman had increased shortness of breath and general weakness. On day 12 of treatment, palpitations, severe shortness of breath, loss of consciousness, BP 70/30 mmHg, heart rate 125 bpm were detected. The patient was transferred to the intensive care unit with a preliminary diagnosis of high-risk acute pulmonary embolism, and emergency treatment was initiated [12]. Unfortunately, the patient died the next day.
The autopsy showed that the immediate cause of death was a large thromboembolus occluding the pulmonary artery and its main branches. Histological investigation revealed thrombosis of the small vessels of the kidneys and brain; a neuroendocrine tumor (G2; pT3pNxpM1b) of the small intestine with metastases to the liver, brain, myocardium, and kidneys was suspected. To clarify the histological diagnosis, an additional immunohistochemical study was conducted. The results were as follows: tumor cells turned out to be negative for chromogranin A and synaptophysin, which allows excluding the neuroendocrine origin of the tumor. Tumor cells were positive for general cytokeratin, cytokeratin 5, p40, and p63. The grade of nuclear pleomorphism is moderate. Signs of keratinization are not detected. The morphological picture and the results of immunohistochemical investigation most closely correspond to a moderately differentiated (G2) non-keratinizing squamous cell carcinoma (ICD-O code: 8070/3) with damage to the wall of the small intestine, liver, lung, kidney, myocardium, and brain (Fig. 2). However, the localization of the primary tumor remained unknown (probably, it was cervical cancer).

Discussion
To the present day, the pathophysiological mechanisms of CAPS development are not fully understood, which is associated with a rather rare occurrence of this syndrome, especially in cancer patients, but the concept of thrombotic storm was proposed [11,13]. Different malignancies are associated with the presence and production of antiphospholipid The clinical picture of CAPS requires a differential diagnosis with sepsis, thrombotic thrombocytopenic purpura, hemolytic uremic syndrome, acute disseminated intravascular coagulation and haemolysis, elevated liver enzymes, and low platelet syndrome [11,15].
In this article, we presented a clinical case in a patient with the clinical diagnosis of SLE complicated by CAPS, but further investigation of autopsy material didn't reveal the histological signs of SLE (lupus nephritis) [8]. On the other hand, there were multiple foci of the moderately differentiated non-keratinizing squamous cell carcinoma, which, in our opinion, probably were metastasis of cervical cancer. We assume that the main trigger factor in the development of CAPS in this patient was squamous cell carcinoma. However, we cannot explain such a high antinuclear antibodies titer even though some tumors may be accompanied by an increase of these antibodies [16,17]. Therefore, the question remains open for us whether the patient had systemic lupus erythematosus or not. In our opinion, it is possible that SLE could act as another triggering and complicating factor. Furthermore, according to literature data, the high titer of antinuclear antibodies is associated with a higher mortality rate [15].

Conclusions
This clinical case of Asherson's syndrome is first described in Ukraine. Its practical significance lies in the fact that, despite rare occurrence, it is always necessary to consider its likelihood in the presence of signs of multiple thromboses and multiple organ failure. Since its development is a consequence of serious diseases, including connective tissue diseases, malignancies, infections, the etiotropic and pathogenetic treatment can prevent the development of CAPS and death. Gastroenterologìa, ISSN 2308-2097 (print), ISSN 2518-7880 (online) Conflicts of interests. Authors declare the absence of any conflicts of interests and their own financial interest that might be construed to influence the results or interpretation of their manuscript. Funding information. This research received no specific funding or grant during its writing.