1/6. cholesteatoma of the external auditory canal and keratosis obturans.keratosis obturans and external auditory canal cholesteatoma have often been regarded as a single entity. However, these are two distinct disorders with their own clinical presentations, physical and pathologic findings, and treatment. keratosis obturans is an accumulation of obstructive desquamated keratin in the external auditory meatus. External auditory canal cholesteatoma is an invasion and erosion of squamous epithelium into a localized area of the bony ear canal. The origin of both entities remains obscure. The clinical symptoms, pathologic processes, and treatment are outlined and compared. case reports are presented to illustrate the features of these two diseases.- - - - - - - - - - ranking = 1keywords = cholesteatoma (Clic here for more details about this article) |
2/6. External ear canal cholesteatoma.External ear canal cholesteatoma (EECC) is a rare otologic entity. Erosion of the inferior canal wall and accumulation of keratin debris are consistent findings. In the past there had been confusion between EECC and keratosis obturans, and they were thought to represent the same disease process. Currently, based on clinical and pathologic findings, it is believed that they are two different entities. In this article we present our experience in treating eight patients with EECC. For limited lesions, local debridement and curettage of necrotic bone is effective management. For more extensive lesions, canalplasty or tympanomastoidectomy is indicated.- - - - - - - - - - ranking = 2.5keywords = cholesteatoma (Clic here for more details about this article) |
3/6. The pathologic features of keratosis obturans and cholesteatoma of the external auditory canal.The presence of a keratin plug occluding the deep external auditory canal was first noted and documented in the 19th century. It has subsequently been proposed that two different diseases can be responsible for the presence of this type of obstruction within the deep meatus: keratosis obturans and external auditory canal cholesteatoma. keratosis obturans is characterized by a dense plug of keratin debris located primarily within the deep meatus. There is an associated hyperplasia of the underlying epithelium and evidence of chronic inflammation within the subepithelial tissue. There is no evidence of erosion or necrosis of the underlying bone. In external auditory canal cholesteatoma the significant finding is extensive erosion of the bony external auditory canal by a wide-mouthed sac, lined with stratified squamous keratinizing epithelium, that arises lateral to the tympanic membrane and is located in the inferior portion of the bony external canal. There is frequently evidence of sequestration of the underlying bone.- - - - - - - - - - ranking = 3keywords = cholesteatoma (Clic here for more details about this article) |
4/6. Primary and secondary keratomas of the frontal sinus.Keratomas in the paranasal sinuses have been described in the world literature with variable frequency and the inaccurate terminology of cholesteatoma. This paper describes an illustrative case and provides a discussion of the etiology and pathology of this disease. Because the pathologic findings are that of a true keratoma, classification of this disease as primary and secondary keratomas is recommended. The classification 1. primary keratoma is recommended for the epidermal cyst of congenital rest origin and 2. secondary keratoma is suggested for epithelial layers and cysts that are secondary to squamous cell implantation or migrations.- - - - - - - - - - ranking = 0.5keywords = cholesteatoma (Clic here for more details about this article) |
5/6. keratosis obturans and external auditory canal cholesteatoma.keratosis obturans and external auditory canal cholesteatoma (EACC) have previously been considered to represent the same disease process. However, review of the literature and our cases reveal these to be two different clinical and pathological processes. keratosis obturans presents as hearing loss and usually acute, severe pain secondary to the accumulation of large plugs of desquamated keratin in the ear canal. External auditory canal cholesteatoma presents as otorrhea with a chronic, dull pain secondary to an invasion of squamous tissue into a localized area of periosteitis in the canal wall. The treatment previously recommended for both of these conditions has been conservative debridement of the external canal and application of topical medication. While this remains the treatment of choice for keratosis obturans, surgery may be required to eradicate EACC.- - - - - - - - - - ranking = 3keywords = cholesteatoma (Clic here for more details about this article) |
6/6. External ear canal cholesteatoma. Case report.External ear canal cholesteatoma is a rare condition in otologic practice. A case in a 43-year-old woman is presented in which despite the extensive nature of the lesion, minimal symptoms and absence of signs delayed diagnosis. The cause of the lesion and its treatment are discussed.- - - - - - - - - - ranking = 2.5keywords = cholesteatoma (Clic here for more details about this article) |