Overview
Papillary adenomas are benign neoplasms often localized in the temporal bone region, traditionally thought to originate from the endolymphatic sac. Recent evidence suggests they may originate from the mucosa of pneumatic spaces surrounding the jugular bulb rather than exclusively from the endolymphatic sac 1.Diagnosis
Radiologic imaging can identify tumor growth centered near the jugular bulb.
Surgical exploration reveals extension towards but not necessarily within the endolymphatic sac lumen.
Histopathology shows both ciliated and nonciliated cells resembling middle ear mucosa.
Immunohistochemical markers confirm keratin positivity and lack of markers for other tissues (e.g., vimentin, glial fibrillary acidic protein, S-100 protein).Management
Surgical resection is indicated for definitive treatment 1.
No specific adjuvant therapies beyond surgical intervention are mentioned in the provided abstracts.Special Populations
No specific management considerations for pregnancy, pediatrics, elderly, or comorbidities are detailed in the provided abstracts 1.Key Recommendations
Re-evaluate the presumed origin of papillary adenomas from the endolymphatic sac, considering alternative origins such as the mucosa of pneumatic spaces surrounding the jugular bulb (Evidence: Moderate) 1.
Utilize surgical exploration and histopathological examination, including immunohistochemical staining, for accurate diagnosis and differentiation from other lesions (Evidence: Moderate) 1.
Primary treatment should involve surgical resection for papillary adenomas (Evidence: Expert opinion) 1.References
1 Pollak A, Böhmer A, Spycher M, Fisch U. Are papillary adenomas endolymphatic sac tumors?. The Annals of otology, rhinology, and laryngology 1995. link