An 8-year-old boy with a Pott's puffy tumor

An 8-year old boy with a history of trauma, sinusitis and a swelling of the frontal. bone with somnolence was diagnosed with a Pott's puffy tumor (PPT). Minimal invasive surgical intervention was performed together with a strict regimen of antibiotic therapy. In this case debridement of the frontal bone was not necessary. Serial X-ray imaging of the skull showed complete ossification of the frontal bone lesion. Early diagnosis using thorough radiological evaluation is necessary to effectuate the proper therapeutic approach. For this reason, a patient with a forehead swelling and a history of trauma and/or sinusitis should be suspected for a PPT. (C) 2003 Elsevier Ireland Ltd. All rights reserved

Validation of exposure visualization and audible distance emission for navigated temporal bone drilling in phantoms

BACKGROUND: A neuronavigation interface with extended function as compared with current systems was developed to aid during temporal bone surgery. The interface, named EVADE, updates the prior anatomical image and visualizes the bone drilling process virtually in real-time without need for intra-operative imaging. Furthermore, EVADE continuously calculates the distance from the drill tip to segmented temporal bone critical structures (e.g. the sigmoid sinus and facial nerve) and produces audiovisual warnings if the surgeon drills in too close vicinity. The aim of this study was to evaluate the accuracy and surgical utility of EVADE in physical phantoms. METHODOLOGY/PRINCIPAL FINDINGS: We performed 228 measurements assessing the position accuracy of tracking a navigated drill in the operating theatre. A mean target registration error of 1.33±0.61 mm with a maximum error of 3.04 mm was found. Five neurosurgeons each drilled two temporal bone phantoms, once using EVADE, and once using a standard neuronavigation interface. While using standard neuronavigation the surgeons damaged three modeled temporal bone critical structures. No structure was hit by surgeons utilizing EVADE. Surgeons felt better orientated and thought they had improved tumor exposure with EVADE. Furthermore, we compared the distances between surface meshes of the virtual drill cavities created by EVADE to actual drill cavities: average maximum errors of 2.54±0.49 mm and -2.70±0.48 mm were found. CONCLUSIONS/SIGNIFICANCE: These results demonstrate that EVADE gives accurate feedback which reduces risks of harming modeled critical structures compared to a standard neuronavigation interface during temporal bone phantom drilling