Abstract
IntroductionPleomorphic adenoma accounts for 65 percent of all salivary gland tumors. It has been identified in several anatomical regions, but pleomorphic adenoma arising in the ear canal, first described in 1951, is extremely rare.Case presentationA 40-year-old Japanese man’s left ear canal was obstructed by a pleomorphic adenoma that caused mild conductive hearing loss. The tumor was resected and he remains disease-free two years after surgery.ConclusionsPleomorphic adenoma usually arises from a major and minor salivary gland, but pleomorphic adenoma of the ear canal is derived from the ceruminous gland. We discuss the present case and 37 other case reports in our effort to clarify the clinical features and the course of pleomorphic adenoma in the ear canal.
Highlights
Pleomorphic adenoma accounts for 65 percent of all salivary gland tumors
Pleomorphic adenoma usually arises from a major and minor salivary gland, but pleomorphic adenoma of the ear canal is derived from the ceruminous gland
We discuss the present case and 37 other case reports in our effort to clarify the clinical features and the course of pleomorphic adenoma in the ear canal
Summary
We describe a case of PA arising in the ear canal. PA of the ear canal is very rare and it presents with various symptoms. Recurrence occurs in approximately 5 percent of PAs arising in the parotid gland after primary surgery, caused by capsule rupture, a positive margin, and tumor spillage [15]. The tumor recurred with cellular atypism and mitotic activity and accompanied several satellite nodules three years after the first resection [7] Another case of recurrence was reported by Pahor et al.; it occurred because of incomplete resection but showed no malignant transformation [9]. It has been reported as not effective and can induce malignant change, it has improved the local control for patients with inadequate margins and/or multinodular recurrence [10,15]. A sufficient excision without breaking the capsule is important for obtaining a good prognosis and a long follow-up after surgery is necessary to check for any recurrence
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