*  biopsy
    *  biopsy, needle
    *  biopsy, fine-needle
    *  chorionic villi sampling
    *  conization
    *  sentinel lymph node biopsy
    *  endoscopy
    *  angioscopy
    *  arthroscopy
    *  bronchoscopy
    *  colposcopy
    *  culdoscopy
    *  cystoscopy
    *  endoscopy, digestive system
    *  cholangiopancreatography, endoscopic retrograde
    *  endoscopy, gastrointestinal
    *  colonoscopy
    *  sigmoidoscopy
    *  duodenoscopy
    *  gastroscopy
    *  proctoscopy
    *  esophagoscopy
    *  fetoscopy
    *  hysteroscopy
    *  laparoscopy
    *  laryngoscopy
    *  mediastinoscopy
    *  neuroendoscopy
    *  thoracoscopy
    *  thoracic surgery, video-assisted
    *  ureteroscopy
    *  video-assisted surgery
    *  thoracic surgery, video-assisted
    *  pneumomediastinum, diagnostic
    *  pneumoperitoneum, artificial