Sirenomelia is a rare congenital anomaly characterized by a single lower extremity which is associated with abnormalities in other organ systems, commonly affecting the gastrointestinal and the urogenital systems. It is sporadic with no increased risk in subsequent pregnancies. In almost all the cases of sirenomelia, a single umbilical artery (SUA) is present which arises from the abdominal aorta. Sirenomelia can be confidently diagnosed in the first trimester while the diagnosis in the second and third trimesters is rendered difficult due to the lack of amniotic fluid in the later gestation. Transvaginal ultrasound and color Doppler have a key role in making the diagnosis and 3D ultrasound helps in better demonstrating the abnormality.

Glucocorticoids are commonly used to treat endocrine as well as non-endocrine disorders. Unfortunately, these agents are associated with multiple adverse effects affecting various organ systems. A 55-year-old woman with type 2 diabetes mellitus and hypertension with no past psychiatric history was admitted to the hospital for acute hypoxic respiratory failure secondary to coronavirus disease 2019 (COVID-19) pneumonia. The patient did not exhibit any psychiatric symptoms during the initial admission. However, she was readmitted three days after the initial discharge, presenting with acute psychosis following the intravenous dexamethasone administration for seven days. Neuropsychiatric effects of glucocorticoids include depression, mania, agitation, mood lability, anxiety, insomnia, catatonia, depersonalization, delirium, dementia, and psychosis. Clinicians should be aware of the acute neuropsychiatric side effects of corticosteroids and evaluate patients for delirium if clinically indicated. Further research is needed to identify the pathophysiology and predisposing factors contributing to neuropsychiatric side effects of corticosteroid administration. The use of atypical antipsychotics in the management of these sequelae needs to be explored as well.

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection has resulted in various medical and psychosocial consequences globally. Respiratory infections are common among patients infected with the SARS-CoV-2 virus, the causative virus of coronavirus disease 2019 . However, various psychiatric and neurocognitive symptoms and sequelae of COVID-19 have been reported as well.This study aimed to describe two clinical case reports of patients with no prior history of psychiatric illnesses admitted to the psychiatric inpatient unit with acute onset of psychosis. A 49-year-old woman with no past medical history and no past psychiatric history was admitted to the inpatient psychiatric unit with suicidal ideation and was noted to have acute psychosis. A 56-year-old woman with a history of hypertension with no past psychiatric history was admitted to the hospital with acute hypoxic respiratory failure secondary to COVID-19 pneumonia and was noted to have acute psychosis.Various psychiatric and neurocognitive symptoms and sequelae of COVID-19 have been reported. However, the pathophysiology, direct biological effects of the disease, treatment modalities, worsening of symptoms due to various medications, and other long-term sequelae are not fully understood. Therefore, clinicians should be mindful of neuropsychiatric symptoms and conduct a detailed history and physical examination on all patients presenting with psychiatric symptoms in the context of COVID-19. It is also essential to assess for signs and symptoms of delirium in patients presenting with neuropsychiatric symptoms. Further research is needed to identify the etiology, predisposing factors, exacerbating or precipitating factors contributing to neuropsychiatric symptoms associated with infection with the SARS-CoV-2 virus. In addition, the pathophysiology contributing to these symptoms and pharmacological interventions for managing these sequelae need to be evaluated.

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The corpus callosum (CC) is the largest interhemispheric commissure connecting the neocortical areas of the two cerebral hemispheres. The spectrum of anomalies of the CC includes agenesis, which may be complete or partial, and hypoplasia. The callosal agenesis may be isolated or may be associated with other abnormalities. Nonvisualization of cavum septum pellucidum and colpocephaly are important signs in the axial view which aid in the diagnosis. Demonstrating the absence of CC in midsagittal plane is the gold standard. We report a case of isolated complete corpus callosal agenesis diagnosed antenatally in the third trimester with a brief review of ultrasound findings in corpus callosal agenesis.