[Role of integrated imaging (computerized tomography and echography) in the surgical reconstruction of the external ear].
Three-dimensional Computed Tomography (3DCT) imaging methods of the skull and ribs by axial and contiguous slices allow the selective rendering of the involved structures. The possibilities given by variable threshold ranges allow 12-bit density structures (Hounsfield Units) to be obtained within threshold limits. Imaging has been optimized by shading solids. Such methods, together with US (duplex-Doppler) techniques, offer new diagnostic possibilities relative to the treatment planning of patients with either congenital malformations or acquired abnormalities of the external ear and in the evaluation of associated abnormalities of craniofacial areas. In the reconstruction of the earlap by autograft of modelled rib cartilage, after preparing an expanded otomastoid skin flap, the above methods allowed accurate preoperative planning with consequently significant reduction of surgical time and better clinical results. Six patients with earlap abnormalities (four with microtia due to complete hemifacial microsomia syndrome, one with anotia and one with post-traumatic loss of the earlap) were studied for reconstruction. High-quality 3DCT images of the rib and auricolar cartilage were obtained in real-scale representation (1:1 ratio) the evaluation of the donor site and of the autograft size. Useful pieces of information on the development and vascularization of an expanded otomastoid flap, after gradual and constant expansion, were given by duplex-Doppler US, which allowed easy monitoring in both surgical planning and follow-up.