MediAI

  Pancreatic mucinous cystic neoplasm Pancreatic Mucinous Cystic Neoplasm (MCN) is a cystic epithelial neoplasm with malignant potential, primarily affecting women and typically arising in the body or tail of the pancreas. It is distinguished by  mucin-producing columnar epithelium and a distinctive ovarian-type stroma . 1. Cause and Etiology The precise cause of MCNs is not well understood, but the etiology is believed to involve a combination of genetic, hormonal, and environmental factors: Hormonal influence : Strongly associated with female sex hormones —nearly all MCNs occur in women, especially in the perimenopausal age group (40–60 years). The ovarian-type stroma is often estrogen and progesterone-receptor-positive. Genetic alterations : KRAS mutations are commonly seen. RNF43 mutations and SMAD4 or TP53 mutations may be present in more advanced or malignant cases. No connection with familial pancreatic cancer ...

  Emphysematous Vertebral Osteomyelitis and Epidural Abscess Caused by Disseminated Klebsiella Infection 1. Cause and Etiology Causative Organism: ·          Klebsiella pneumoniae is a Gram-negative, encapsulated, facultatively anaerobic bacillus in the family Enterobacteriaceae. ·          Hypervirulent strains, especially Klebsiella pneumoniae serotypes K1 and K2, are increasingly associated with disseminated infections, including liver abscess, endophthalmitis, meningitis, and spinal infections. Routes of Infection: ·          Hematogenous spread from a primary focus, typically from: o     Pyogenic liver abscess (especially in diabetics) o     Urinary tract infections o     Pneumonia ·          Rarely, direct inoculation or contiguous spread from ad...