Comparative Study of Diluted Hydrogen Peroxide and Sulfur Hexafluoride in the Contrast-Enhanced Ultrasound Assessment of Anal Fistulas.

Background: Endoanal ultrasound for the diagnosis of anal fistulas requires the injection of hydrogen peroxide, but it is often uncomfortable for the patient and has the potential to cause complications. Novel ultrasound contrast is currently available.

Objective: To assess the efficacy and safety of sulfur hexafluoride as an ultrasound contrast agent for the diagnosis of a perianal fistula by comparing it with those of 50% diluted hydrogen peroxide.

Infection with SARS-CoV-2 as a potential achalasia trigger.

Idiopathic achalasia is a chronic oesophageal motility disorder caused by loss of inhibitory neurons at the esophageal myenteric plexus resulting in incomplete relaxation of the lower oesophageal sphincter and abnormal peristaltism.  Among the possible causes of this, an immune response secondary to infection by some viruses has been implicated. SARS-CoV-2 could be considered among them.

Clostridium septicum endophthalmitis as the first manifestation of a colon adenocarcinoma: A case report.

Clostridium septicum endophthalmitis is an extremely rare infection with only a few cases reported in the literature. It has an endogenous origin and is associated with gastrointestinal and haematological malignancies. We present the case of a 62-year-old male who presented this infection as the first manifestation of a colon adenocarcinoma.