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Anatomy of the Ear01:16

Anatomy of the Ear

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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External Auditory Canal Pleomorphic Adenoma: A Rare Case Presentation.

Mohammed Nadeem Afroze Malli1, Asma Mohd Shoukat2

  • 1Deptartment of ENT, Al-Ameen Medical College, Vijayapura, Karnataka India.

Indian Journal of Otolaryngology and Head and Neck Surgery : Official Publication of the Association of Otolaryngologists of India
|February 6, 2023
PubMed
Summary

Pleomorphic adenoma, a rare benign tumor of the external auditory canal, was identified in a young woman. This case highlights the importance of distinguishing this ceruminous gland tumor from malignant counterparts.

Keywords:
Ceruminous adenomaExternal auditory canalPleomorphic adenomaear ceruminoma

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Area of Science:

  • Otolaryngology
  • Surgical Pathology
  • Oncology

Background:

  • Pleomorphic adenoma is an exceptionally rare benign tumor arising from the external auditory canal's ceruminal glands.
  • Ceruminal glands, modified sweat glands, can develop into various benign or malignant tumors.
  • Differential diagnosis includes other ceruminous gland neoplasms like adenoid cystic carcinoma and adenocarcinoma.

Purpose of the Study:

  • To report a rare case of pleomorphic adenoma in the external auditory canal.
  • To emphasize the clinical and histological features of this benign neoplasm.
  • To highlight the importance of accurate diagnosis and differentiation from malignant tumors.

Main Methods:

  • Clinical presentation of a 25-year-old female with a year-long history of aural swelling and otalgia.
  • Physical examination revealed a canal-filling aural mass.
  • Computed tomography (CT) imaging excluded intracranial extension or parotid gland involvement.
  • Excision biopsy followed by histological examination confirmed pleomorphic adenoma.

Main Results:

  • Histopathological analysis confirmed the diagnosis of pleomorphic adenoma.
  • The tumor presented as a canal-filling mass without affecting adjacent structures.
  • No signs of intracranial extension or parotid gland association were observed on CT.

Conclusions:

  • Pleomorphic adenoma of the external auditory canal, though rare, should be considered in the differential diagnosis of aural masses.
  • Accurate histological examination is crucial for distinguishing benign pleomorphic adenoma from malignant ceruminous gland tumors.
  • Potential for recurrence or malignant transformation necessitates careful follow-up, similar to salivary gland pleomorphic adenomas.