Ataxia and ophthalmoplegia: an atypical case of Miller Fisher syndrome (MFS) with anti-GAD antibody.

BACKGROUND: Miller Fisher syndrome (MFS) is frequently encountered variant of Gillian Barre Syndrome (GBS). It has distinct clinical and serological features. Here we describe an atypical GQ1b seronegative case with significantly elevated anti-glutamic acid decarboxylase antibody (GAD-Ab). CASE DESCRIPTION: A 24-year-old previously healthy Caucasian male presented with rapidly progressive ascending weakness, binocular diplopia and autonomic instability for 2 days. Examination was remarkable for asymmetrical facial weakness (L > R), opthalmoplegia and truncal ataxia without areflexia. MRI brain was normal. CSF analysis showed elevated protein. Electromyography/Nerve Conduction Study (EMG/NCS) within the first week was normal. Antiganglioside antibodies were negative. Extended serological and neoplastic workup revealed negative anti-GQ1b antibody, but significant increase of GAD-Ab, Voltage Gated Calcium Channel (VGCC) Ab, and mild elevation of TPO Ab IgG and Thyroglobulin (Tg) Ab IgG. Clinical diagnosis of partial MFS was made. He received a course of IVIg (2 g/kg over 5 days) and had complete recovery in 3 months. CONCLUSION: There are incomplete or atypical forms of MFS. Recognition of its various clinical presentations is essential for early diagnosis and optimal management. Further investigation is needed to elucidate the role of anti-GAD-ab and other autoimmune antibodies in the pathogenesis of GQ1b-seronegative MFS patients.

Intraluminal carotid thrombosis and acute ischemic stroke associated with COVID-19.

COVID-19 (Coronavirus disease 2019) caused by SARS-CoV-2 has a diverse constellation of neurological manifestations that include encephalopathy, stroke, Guillain-Barré syndrome, myelitis, and encephalitis. Intraluminal carotid thrombi (ILT) are infrequent lesions seen in only 1.6% of patients with acute ischemic stroke. Underlying atherosclerosis is the most common lesion associated with ILT formation. However, with COVID-19, we have encountered ILT in patients without significant atherosclerotic disease. The endothelial inflammation and hypercoagulable state associated with COVID-19 pose a risk of arterial and venous thromboembolism and could have contributed to this presentation although the exact pathophysiology and optimal treatment of ILT in COVID-19 remain elusive. Herein, we present a series of ischemic stroke patients with carotid ILT in the setting of a recent SARS-CoV-2 infection.

Co-occurrence of multiple sclerosis and myasthenia gravis: A case report and review of immunological theories.

Autoimmune mechanisms are implicated in both myasthenia gravis (MG) and multiple sclerosis (MS), and hypothesis of a common immunological mechanism of pathogenesis is supported by the fact that this rare combination of the two diseases occurs more frequently than expected by random association. Although MS is primarily mediated by T lymphocytes and MG primarily involves the destruction of the neuromuscular junction by antibodies, there are evidences that support both cell-mediated and humoral immunity are involved in the pathogenesis of both diseases. Different studies have shown dysfunction of T cells as well as B cells involved in the pathogenesis of both disorders. Previous case reports, mainly present female patients who had a mild presentation of MG, either prior or after diagnosis of MS. In this article, in addition to presenting a unique male patient with a previous diagnosis of MS, who presented with MG crisis, we aimed to review the literature to find the common immunological mechanisms involved in the pathogenesis of MG and MS.

Murine Typhus: A Life-Threatening Presentation of a Case in Galveston, Texas.

BACKGROUND Murine typhus is a rare bacterial infection caused by Rickettsia typhi, which is transmitted from rodents to humans through the infected Xenopsylla cheopis flea. The disease presentation is often non-specific, leading to unnecessary tests, and a delay in diagnosis and treatment. CASE REPORT A report is presented of a 22-year-old, previously healthy man, who presented with several symptoms and signs that increased in severity, requiring admission to the medical intensive care unit (MICU). After an extensive bacterial and viral laboratory workup, IgM and IgG titers confirmed the diagnosis of murine typhus due to infection by Rickettsia typhi. The patient was treated with doxycycline, which resulted in significant clinical improvement. CONCLUSIONS Murine typhus can present with a characteristic triad of fever, headache, and rash but also with other symptoms and signs and can vary in severity. Given its increasing prevalence in coastal cities, awareness of this infection and early diagnosis and treatment with doxycycline can reduce patient morbidity.

Atezolizumab-related encephalitis in the intensive care unit: Case report and review of the literature.

Atezolizumab is a monoclonal antibody that targets programmed death ligand-1. Treatments with this drug may cause immune-related adverse events by creating an exaggerated inflammatory response. The most common side effects are fatigue, rash, and gastrointestinal symptoms. Cases of central nervous system toxicity such as encephalitis and encephalopathy are uncommon. We present the case of a 53-year-old female with metastatic squamous cell carcinoma of the cervix who presented to the emergency room 13 days after receiving atezolizumab with altered mental status, headache, and meningeal signs. She was admitted to the intensive care unit. Infectious, anatomical, and neoplastic etiologies were ruled out. Auto-immune meningoencephalitis was diagnosed and treated with high-dose steroids. Within 10 days of the diagnosis, she had clinical, radiological, and laboratory improvement. Given the increasing use of novel immunotherapies and life-threatening side effects associated with them, healthcare providers in the intensive care unit should be aware of their diagnosis and management.