Fig. 6.

Intralabyrinthine schwannoma (ILS) in the right cochlea. Tumor resection via subtotal cochleoectomy and cochlear implantation (patient 11). A Tumor mass (arrow) in the middle and partially in the apical turn as well as partially in the basal turn (not shown) with contrast enhancement on MRI (T1-w, axial). B View of the middle ear with situation following implantation of a stapes wire prosthesis after Schuknecht about 15 years earlier. C View of the scala tympani (ST) by means of mini-endoscope [19] without any signs of a tumor in the basal part of the basal cochlear turn. The basilar membrane is seen as a dark line (arrow). D Opening of the cochlea in the anterior–inferior part of the cochleariform process reveals the tumor (*). The round window (RW) and the oval window (OW) are covered with fascia. E After subtotal cochleoectomy for tumor resection, only the lateral wall of the basal turn and a stump of the modiolus (M) are present. The temporarily inserted placeholder (“dummy electrode carrier”) is located at the cochlear wall (endoscopic view, 3mm, 0º). A CI with the electrode carrier placed close to the modiolus (Nucleus® CI 512 with Contour Advance electrode, Cochlear, Australia) was inserted (F) and the cochlea was partially reconstructed with perichondrium and bone pâté (not shown). VII Facial nerve; PCW posterior canal wall P promontory, CP cochleariform process