ear







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  • Normal

    • external auditory canal
      • squamous epithelium
      • outer 1/3 has ceruminous glands (apocrine)
      • inner 2/3 lacks adnexal structures
    • tympanic membrane
      • external surface: squamous epithelium
      • internal surface: simple cuboidal ciliated epithelium
      • no glands
    • internal auditory canal
      • ciliated columnar epithelium
      • goblet cells, seromucous glands
    • mastoid air cells: simple flat/cuboidal ciliated epithelium

  • Non-neoplastic

  • WHO neoplasms

    • external ear
      • cerumin gland
        • malignant
          • adenocarcinoma
          • adenoid cystic carcinoma
          • mucoepidermoid carcinoma
        • benign
          • adenoma
          • chondroid syringoma
          • syringocystadenoma papilliferum
      • cylindroma
      • SCC
      • embryonal rhabdomyosarcoma
      • osteoma
      • exostosis
      • angiolymphoid hyperplasia with eosinophilia
    • middle ear
      • adenoma
      • papillary tumors
        • aggressive papillary tumor
        • Schneiderian papilloma
        • inverted papilloma
      • SCC
      • meningioma
    • inner ear
      • vestibular schwannoma
      • lipoma
      • hemangioma
      • endolymphatic sac tumor
    • hematolymphoid
      • CLL
      • langerhans cell histiocytosis
    • metastasis
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