Adult obstructive sleep apnea related to nasopharyngeal obstruction: a case of retropharyngeal lipoma and pathogenetic considerations.
Cervico facial lipomas are relatively rare and only a few of them affect retropharyngeal space. Because of their slow growth rate, they can reach large size before causing respiratory disturbances and surgery is the treatment of choice. We present a case of 73-year-old female patient with severe obstructive sleep apnea [Apnea Hypopnea Index (AHI) = 43; mean SaO2 = 84%; lowest SaO2 = 60%; time of sleep with SaO2<90% = 35%]. Computed tomography scan showed a low attenuation bilobed retropharyngeal mass (5 x 2 x 2.5 cm) compatible with lipoma, extending from the nasopharynx to the superior bound of the oropharynx (at the level of C2-C3 passage). Removal of the tumor cured the obstructive sleep apnea; the sleep study at 1 month follow-up showed the normalization of the somnographic parameters (AHI = 12; lowest SaO2 = 76%; mean SaO2 = 95%; time of sleep with SaO2<90% = 4%).
Piccin
Ottavio
O
ENT Department, S. Orsola Hospital, Bologna University, via Massarenti 9, 40138 Bologna, Italy. o1piccin@yahoo.it
Sorrenti
Giovanni
G
D000368:Aged; D005260:Female; D006801:Humans; D008067:Lipoma / Q000000981:diagnostic imaging / Q000235:genetics* / Q000473:pathology*; D009305:Nasopharynx / Q000000981:diagnostic imaging / Q000503:physiopathology*; D010610:Pharyngeal Neoplasms / Q000000981:diagnostic imaging / Q000235:genetics* / Q000473:pathology*; D017286:Polysomnography; D020181:Sleep Apnea, Obstructive / Q000000981:diagnostic imaging / Q000503:physiopathology*; D012894:Sleep Stages; D014057:Tomography, X-Ray Computed