Unusual Presentation of a Rare Pneumothorax in a Patient With COVID-19 Pneumonia: A Case Report.

Coronavirus disease 2019 (COVID-19) is a respiratory and systemic disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. Since the start of the COVID-19 pandemic, pneumothorax (PTX) has only been reported as a complication of the virus-induced pneumonia in less than 1% of cases. The majority of them developed symptoms in the setting of either an underlying history of lung disease or being placed on a mechanical ventilator during admission.

Hydralazine-Induced Antineutrophil Cytoplasmic Antibody-Associated Vasculitis: Asymptomatic and Renal-Restricted Presentation.

BACKGROUND Hydralazine, a potent vasodilator widely used to treat hypertension, has been implicated in an increasing number of cases of drug-induced autoimmune diseases in recent years. However, antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis secondary to hydralazine use has rarely been described and most reported cases involved multi-organ-related vasculitis, including skin and lung-kidney manifestations. ANCA-associated vasculitis is an immune-inflammatory condition characterized by necrotizing vasculitis with few or no immune deposits, predominantly affecting small vessels.

An Unusual Cause of Pyogenic Liver Abscess.

Pyogenic liver abscess (PLA) is the result of portal vein pyemia, which usually originates from the hepatobiliary system or the gastrointestinal tract. Gram-negative organisms are the most common causative pathogens in PLA. is an anaerobic gram-positive, low-virulence organism that most commonly affects neutropenic patients with hematological malignancy and has not been reported to cause PLA.