case_images: PMC2822257_01
case_images: Preoperative pure tone audiometry shows conductive hearing loss on the left ear (10/70 dB). Right ear is normal (7/10 dB).
case_images: jkms-19-155-g001.jpg
case_images: PMC2822257_01_jkms-19-155-g001.jpg
case_images: F1
case_images: Pure tone audiometry showed conductive hearing loss on the left ear (Fig. 1).
case_images: Coronal (A, B) and axial (C, D) computed tomography demonstrate a mass-like lesion with soft tissue density occupying the middle ear and mastoid cavity of the left ear (B, D).
case_images: jkms-19-155-g002.jpg
case_images: PMC2822257_01_jkms-19-155-g002.jpg
case_images: F2
case_images: Bony erosions were suspected in tegmen tympani and long process of incus of the left ear (Fig. 2).
case_images: Histologic features of the lesion. (A) The lesion is composed of exclusively mature disorganized glial tissue and fibrovascular elements in a rather loose fibrillary background. (B) Distended glandular structures are noted at the periphery of the glial tissue (H&E, x100).
case_images: jkms-19-155-g003.jpg
case_images: PMC2822257_01_jkms-19-155-g003.jpg
case_images: F3
case_images: The lesion consisted of exclusively mature, disorganized glial tissue with fibrovascular tissue in a rather loose fibrillary background (Fig. 3A). Small distended glands, lined by ciliated, flat or cuboidal epithelium, were present at the periphery of the lesion (Fig. 3B).
case_images: Immunohistochemical features. The lesion shows diffuse positive reaction for GFAP (A) and S100 protein (B) (x100).
case_images: jkms-19-155-g004.jpg
case_images: PMC2822257_01_jkms-19-155-g004.jpg
case_images: F4
case_images: The glial tissue revealed diffuse positive reaction for GFAP (Fig. 4A) and S100 protein (Fig. 4B), but negative reaction for MAP-2 and CK.