Polyomaviruses are small, non-enveloped viruses with a circular double-stranded DNA genome. Using a generic polyomavirus PCR targeting the VP1 major structural protein gene, a novel polyomavirus was initially identified in resected human liver tissue and provisionally named Human Polyomavirus 12 (HPyV12). Its 5033 bp genome is predicted to encode large and small T antigens and the 3 structural proteins VP1, VP2 and VP3. Phylogenetic analyses did not reveal a close relationship to any known human or animal polyomavirus. Investigation of organs, body fluids and excretions of diseased individuals and healthy subjects with both HPyV12-specific nested PCR and quantitative real-time PCR revealed additional virus-positive samples of resected liver, cecum and rectum tissues and a positive fecal sample. A capsomer-based IgG ELISA was established using the major capsid protein VP1 of HPyV12. Seroprevalences of 23% and 17%, respectively, were determined in sera from healthy adults and adolescents and a pediatric group of children. These data indicate that the virus naturally infects humans and that primary infection may already occur in childhood.

Right lobe living donor liver transplantation (LD-LTx) is currently performed at an increasing number of transplant centers. Donor selection, donor safety, donor recovery, and postdonation psychological impairment are essential criteria to determine whether and under which conditions LD-LTx is justifiable. Before commencing the LD-LTx program, approval was obtained from the local ethics committee. Potential donors underwent a comprehensive multistep evaluation protocol to exclude any conditions that could lead to an increased operative risk. Each donation was approved by the local Living Donation Commission. Follow-up investigations were performed after 6 and 12 months. Liver regeneration was assessed by computed tomography scan and magnetic resonance imaging scan derived volumetries. Quality of life (QOL) was investigated according to the Anamnestic Comparative Self-Assessment Scale (ACSA) before donation, and 6 and 12 months after donation. As of December 2001, 43 right lobe living donations have been performed at the Charité, Campus Virchow, Berlin. None of the donors died or has suffered life-threatening or persisting complications. All patients recovered completely. Complications occured in 8 donors (18%). The incidence of perioperative surgical complications was 9%, comprising temporary biliary leakages (n = 3; 6.8%) as well as postoperative bleeding (n = 1). Liver volume regeneration approximated 72% ± 15% of predonation volume by 6 months and 85% ± 18% (mean ± SD) by 12 months. There was no evidence of significant psychological impairment after donation. QOL increased after donation compared with the preoperative state (P < .05). In our experience, LD-LTx has proven to be a practicable and safe procedure. However, there is a considerable risk of postoperative complications. The donor selection process plays a pivotal role in preventing complications. The discussion of potential risks, especially potential life-threatening risks, must be an integral part of informed consent.

The paper evaluates the application of a mixed reality (MR) headmounted display (HMD) for the visualization of anatomical structures in complex visceral-surgical interventions. A workflow was developed and technical feasibility was evaluated. Medical images are still not seamlessly integrated into surgical interventions and, thus, remain separated from the surgical procedure. Surgeons need to cognitively relate 2-dimensional sectional images to the 3-dimensional (3D) during the actual intervention. MR applications simulate 3D images and reduce the offset between working space and visualization allowing for improved spatial-visual approximation of patient and image. The surgeon's field of vision was superimposed with a 3D-model of the patient's relevant liver structures displayed on a MR-HMD. This set-up was evaluated during open hepatic surgery. A suitable workflow for segmenting image masks and texture mapping of tumors, hepatic artery, portal vein, and the hepatic veins was developed. The 3D model was positioned above the surgical site. Anatomical reassurance was possible simply by looking up. Positioning in the room was stable without drift and minimal jittering. Users reported satisfactory comfort wearing the device without significant impairment of movement. MR technology has a high potential to improve the surgeon's action and perception in open visceral surgery by displaying 3D anatomical models close to the surgical site. Superimposing anatomical structures directly onto the organs within the surgical site remains challenging, as the abdominal organs undergo major deformations due to manipulation, respiratory motion, and the interaction with the surgical instruments during the intervention. A further application scenario would be intraoperative ultrasound examination displaying the image directly next to the transducer. Displays and sensor-technologies as well as biomechanical modeling and object-recognition algorithms will facilitate the application of MR-HMD in surgery in the near future.