| Summary: | Abstract Background Posterior reversible encephalopathy syndrome (PRES) is a neurological syndrome characterised by a range of neurological symptoms and signs, and distinctive neuroimaging findings reflecting vasogenic oedema. Posterior reversible encephalopathy syndrome has been described in association with many autoimmune diseases, but its association with mixed connective tissue disorder (MCTD) is very rare. After an extensive review of the literature, we found only three cases of posterior reversible encephalopathy syndrome in association with mixed connective tissue disorder. But unlike other cases, in our patient, PRES is the presenting manifestation of mixed connective tissue disorder which is first of its kind. Case presentation We present a 30-year-old female from Southern India who had initially reported with complaints of fever, multiple episodes of vomiting and cough with expectoration. She had accelerated hypertension and moderate thrombocytopenia. Two days later, she developed sudden onset of visual disturbances and had a drop in sensorium. Neuroimaging done was suggestive of atypical posterior reversible encephalopathy syndrome, and autoimmune workup was positive for mixed connective tissue disorder. With prompt blood pressure control and anti-seizure medications, she recovered completely. Conclusion Early diagnosis and prompt control of blood pressure, along with anti-seizure measures, play a crucial role in management. Awareness about this rare association is essential for early diagnosis and treatment, and therefore reducing the risk of permanent neurologic deficits. This case is being reported because of its rarity.
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