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Introduction.Peritoneal involvement in systemic lupus erythematosus (SLE) is rare and is even rarer in the presence of clinically evident ascites. Case presentation. A 23-year-old female in the early puerperium is admitted to the Emergency Department for abdominal pain. She had fever and visible ascites. Laboratories demonstrated lymphopenia, leukocytosis, and acute kidney injury with proteinuria. Peritoneal fluid showed a cellular count of 338 leukocytes/mL, with negative cultures. Specific antibodies demonstrated SLE. The use of steroids and cyclophosphamide showed clinical improvement. Discussion. Peritoneal involvement in SLE is uncommon, reported in 16% of cases. It needs to be suspected in patients with SLE and abdominal pain.

Background: Brain 18 FDG PET is very useful in the diagnosis of autoimmune encephalitides against post-synaptic receptors. However, little is known about the metabolic changes in other autoimmune encephalitides, such as Bickerstaff stem encephalitis (BBE). Objective: to report the case of a patient with BBE with an 18 FDG PET study and to review the literature. Results: A 20-year-old man with no relevant history presented to the emergency department due to a clinical picture of 7 days of evolution, characterized by non-painful distal paresthesias in the 4 extremities, diplopia, instability on gait and dysphagia. On the day of his hospital stay, he presented alterations in his awake state. The clinical diagnosis of Bikerstaff's stem encephalitis was made. In his paraclinical tests, the cerebrospinal fluid was normal. He received treatment with human immunoglobulin (2 grams/kg) for 5 days. An 18 FDG PET study reported hypermetabolism in the putamen and bilateral caudate nucleus and bilateral occipital hypometabolism. Conclusion: brain 18-FDG PET may be a subrogate marker for understanding CNS compromise in BBE.