Concomitant autoimmune hemolytic anemia and pulmonary embolism associated with mild COVID‐19: A case report

Despite its rarity, AIHA can be associated with COVID‐19. It should be suspected in a patient with recent COVID‐19 presenting with unexplained anemia.     

Primary leiomyosarcoma of the middle ureter: A rare case report with literature review

Leiomyosarcoma is a rarely seen neoplasm of the ureter. Malignant tumors of smooth muscle of the ureter are extremely rare, and about 22 cases of leiomyosarcoma of ureter have been reported to date. A 57‐year‐old diabetic Pakistani man presented with a dull ache pain in the right flank. Past surgical history was three ureteroscopic surgeries for a ureteric stricture. Computed tomography showed a stricture with a peri‐ureteral soft tissue mass of 11 mm x 5 mm at the middle third of the ureter at the level of common iliac vessels. laparoscopic excision with safety margin and right ureterovesical reimplantation is performed. Diagnosis of leiomyosarcoma of the right ureter was made, and one iliac lymph node was excised and was positive for tumor by pathologic examination. Although leiomyosarcoma is rarely seen in urinary tract, it should be considered in the differential diagnosis of ureteral stricture disease and retroperitoneal tumors.     

Antimicrobial Polyurethane Films Based on Quaternary Ammonium Salts Functionalized Soybean Oil

In the context of diligent effort to develop active coating materials that have the potential to minimize the spread of bacterial infection, antibacterial polyurethane films based on soybean polyols are successfully prepared and characterized. Particularly, the epoxidized soybean oil (ESBO) is modified with N,N-dimethylaminopropylamine (DMAPA) or N,N-diethylaminoethanol (DEAE) to give two bio-derived tertiary amine functionalized polyols (AmSBO and AlSBO, respectively). Subsequently, the synthesized bio-derived tertiary amine functionalized polyols (AmSBO and AlSBO) are quaternized with methyl iodide for antibacterial effectiveness. The FTIR and ¹H NMR results of functional polyols display significant transesterification and aminolysis (amide formation) in addition to the ring-opening reaction of the oxirane ring. The polyurethane films are prepared by reacting these functional polyols with isocyanate prepolymer based on methylene-bis(phenyl isocyanate) (MDI). The realized polyurethanes are successfully applied as functional coatings on polypropylene films. In addition, free-standing polyurethane films are obtained and their thermal, optical, and barrier properties are studied. Moreover, the polyurethane films displayed significant antibacterial activities against different pathogens.