Bilateral Synchronous Ectopic Ethmoid Sinus Olfactory Neuroblastoma: A Case Report.
BACKGROUND
Olfactory neuroblastoma (ONB), also known as esthesioneuroblastoma, is a rare malignant head and neck cancer thought to originate from the olfactory epithelium. It typically invades contiguous structures at presentation. We report a very rare case of multifocal and ectopic ONB.


METHODS
A 41-year-old man presented with left nasal obstruction and occasional left epistaxis associated with headache. Endoscopic examination of the nasal cavities and computed tomography suggested bilateral polypoid masses. Histopathological diagnosis after endoscopic resection established bilateral olfactory neuroblastoma of the ethmoid sinuses. The patient received postoperative radiotherapy. He remains free of disease 4 years after treatment.


CONCLUSIONS
To the best of our knowledge this is the second documented case of multifocal ectopic olfactory neuroblastoma. Clinicians should consider ONB in the differential diagnosis of bilateral synchronous nasal and paranasal masses to avoid delayed diagnosis. Endoscopic resection of ONB could be an option in selected cases.
Department of Otolaryngology, La Paz University Hospital, La Paz University Hospital Institute for Health Research (IdiPAZ), Madrid, Spain.
Elena
E
Leon-Soriano
Department of Otolaryngology, La Paz University Hospital, La Paz University Hospital Institute for Health Research (IdiPAZ), Madrid, Spain.
Carolina
C
Alfonso
Department of Pathology, La Paz University Hospital, Madrid, Spain.
Laura
L
Yebenes
Department of Otolaryngology, La Paz University Hospital, La Paz University Hospital Institute for Health Research (IdiPAZ), Madrid, Spain.
Julio
J
Garcia-Polo
Department of Otolaryngology, La Paz University Hospital, La Paz University Hospital Institute for Health Research (IdiPAZ), Madrid, Spain.
Luis
L
Lassaletta
Department of Otolaryngology, La Paz University Hospital, La Paz University Hospital Institute for Health Research (IdiPAZ), Madrid, Spain.
Javier
J
Gavilan
D000328:Adult; D018304:Esthesioneuroblastoma, Olfactory / Q000473:pathology*; D005005:Ethmoid Sinus / Q000473:pathology*; D006801:Humans; D008297:Male; D010255:Paranasal Sinus Neoplasms / Q000473:pathology*