Pneumopericardium due to bronchopericardial fistula formation is a rare complication secondary to necrotizing pneumonia. Several such cases are reported due to different suppurative bacterial infections. Persistent fistulous communication has been reported to lead to tension pneumopericardium and hemodynamic instability, requiring urgent intervention such as pericardial drainage. A 41-year-old male patient, known to have chronic kidney disease and diabetes mellitus, presented with acute respiratory symptoms. Upon admission, the patient was febrile and required oxygen support via nasal prongs. A chest X-ray showed fibrocavitatory changes on the right side, with patchy air shadowing around the cardiac silhouette and a continuous diaphragm sign. A contrast-enhanced computed tomography (CECT) thorax revealed extensive areas of consolidation with necrotic areas within, forming a thin-walled cavity involving the right middle lobe. Also, suspicious communication of this cavity with the pericardial cavity along the right atrium was seen, with minimal pericardial collection and air foci within. The pleural fluid culture showed growth of Klebsiella pneumoniae. According to the antibiotic sensitivity report, the patient was started on IV meropenem and gentamicin for 21 days while monitoring kidney functions. The patient clinically improved on antibiotics, and follow-up radiological investigations showed resolution of pneumopericardium. In this patient, pneumopericardium was mild, and there was no evidence of tension pneumopericardium. Thus, conservative management with antibiotics was provided, with successful resolution. Unlike this case, if evidence of tension pneumopericardium had been present, emergency interventions for decompression would have been required, and these cases would have had a poor prognosis. This case demonstrates the importance of high suspicion and early diagnosis of pneumopericardium in patients with necrotizing pneumonia. Prompt treatment in these patients can prevent further life-threatening sequelae.

BACKGROUND: Curvularia hawaiiensis (formerly Bipolaris hawaiiensis) is a plant pathogen often isolated from soil and vegetative material. However, only a few cases of opportunistic invasive infections in humans have been described.
METHODS: A 16-year-old female patient without comorbidities was admitted to the emergency department because of fever and chest pain. We described the first coinfection of Curvularia hawaiiensis and Mycobacterium tuberculosis necrotising pneumonia.
CONCLUSIONS: Multiple infections can alter immune responses. However, immunosuppression is the most critical risk factor for infection with species of the genus Curvularia. Therefore, it is crucial to carefully examine patients with tuberculosis, as they may rarely be coinfected with unusual fungi.

BACKGROUND: Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) is a common pathogen that usually causes bacteraemia, osteomyelitis, as well as skin and soft tissue infections. However, deep venous thrombosis (DVT) and necrotising pneumonia are rare in infants.
METHODS: We report the case of a one-month-five-day-old girl who was hospitalised for DVT and necrotising pneumonia due to septicaemia associated with Staphylococcus aureus. She recovered after treatment with intravenous antibiotics and multiple anticoagulant therapy, but DVT persisted at the three-year follow-up. Collateral circulation around the DVT was well-formed. Post thrombotic syndrome was not observed.
CONCLUSIONS: Staphylococcus aureus complicated by DVT and necrotising pneumonia is rare and can be successfully treated.

It may be necessary a consideration about the best approach to the acute concomitant problems that critical COVID-19 patients can develop. They require a rapid diagnosis and an early treatment by a multidisciplinary team. As a result, we would like to describe two clinical cases a patient with diagnosis of COVID-19 pneumonia with good respiratory evolution that, after extubation suffered an acalculous cholecystitis and a patient with COVID-19 pneumonia that suffered an overinfection with necrotising pneumonia that presented with haemoptysis and was finally treated with arterial embolisation by the interventional radiologist\'s team.

Staphylococcus aureus is a major human pathogen, inducing several infections ranging from the benign to the life-threatening, such as necrotising pneumonia. S. aureus is capable of producing a great variety of virulence factors, such as bicomponent pore-forming leucocidin, which take part in the physiopathology of staphylococcal infection. In necrotising pneumonia, Panton-Valentine leucocidin (PVL) induces not only lung injury and necrosis, but also leukopenia, regarded as a major factor of a poor prognosis. The aim of the present study was to evaluate the effect of bicomponent pore-forming leucocidin, PVL and gamma haemolysin on bone marrow leucocytes, to better understand the origin of leukopenia. Using multi-parameter cytometry, the expression of leucocidin receptors (C5aR, CXCR1, CXCR2, and CCR2) was assessed and toxin-induced lysis was measured for each bone marrow leucocyte population. We observed that PVL resulted in myeloid-derived cells lysis according to their maturation and their C5aR expression; it also induced monocytes lysis according to host susceptibility. Haemolysin gamma A, B, and C (HlgABC) displayed cytotoxicity to monocytes and natural killer cells, hypothetically through CXCR2 and CXCR1 receptors, respectively. Taken together, the data suggest that PVL and HlgABC can lyse bone marrow leucocytes. Nevertheless, the origin of leukopenia in severe staphylococcal infection is predominantly peripheral, since immature cells stay insensitive to leucocidins.

Necrotising pneumonia (NP) is a potentially severe complication of community-acquired pneumonia characterised by necrosis of consolidated lung tissue. A 7-year-old boy and a 6-year-old boy are presented, both of whom had a complicated influenza infection which evolved into severe NP caused by Streptococcus pneumoniae. Both needed intensive care for invasive respiratory support. Despite extensive pleural involvement in both cases, only one required thoracic surgery. Case 1 also developed anaemia, hyponatraemia and hypo-albuminaemia, resulting in generalised oedema. Despite the severe morbidity, both boys made a full recovery. The diagnosis of NP should always be considered in a child with pneumonia who remains unwell despite 72 hours of appropriate antibiotics, particularly if there is evidence of pleural disease. Although S. pneumoniae is the main agent for NP, the influenza virus may be a precipitating factor.

Necrotising pneumonia (NP) is a rare complication of bacterial pneumonia which is associated with severe morbidity and mortality. Pneumonia of polymicrobial aetiology predicts worse pathology with fulminating clinical course. Reports of necrotising pneumonia from multiple bacterial infections are scanty in published literature. We report a case of a toddler with NP in whom Klebsiella pneumonia and Staphylococcus aureus, two pathogens which are well documented in its aetiopathogenesis, were isolated concurrently from his sputum and blood. Severe pneumonia, which shows slow response to recommended antibiotics treatment, should raise the suspicion of NP and possibly one of the polymicrobial origins. Even in resource-constrained settings, prompt institution of antibiotics and supportive care can result in resolution of pulmonary lesions.