24 Neoplastic - Ear Flashcards
Why is aspergillus infxn a RF for ear and temporal bone tumors?
It produces aflatoxin B, a known carcinogen
What are other RF for development of ear and temporal bone tumors
H/o RT to H&N, chronic chromate burns 2/2 using matchsticks to clean the ear canal
What is m/c site of ear and temporal bone tumors
EAC
What is m/c route of spread of tumors in the cartilaginous portion of the EAC
Fissures of Santorini
What is the m/c histo type of tumor involving the EAC or middle ear
SCCa
Where do most BCCs of the EAC arise
concha
What is m/c tumor of glandular origin to involve the EAC or middle ear
ACC
What are the m/c types of sarcoma of the temporal bone
RMS, chondrosarcoma, and osteosarcoma
What are the m/c sites of origin of mets to temporal bone
Breast, lung, kidney
Tumors that met to the temporal bone hematogenously most often involve which area of temporal bone
petrous apex
Tumors that met to the temporal bone via meninges most often traverse what structure
IAC
What is m/c presentation of tumors of EAC
Unremitting pain and serosanginous otorrhea
What percent of pts with a tumor in the EAC will present w/ cervical mets
10%
What percent of pts with a tumor in the middle ear will present with FN palsy
20-40%
What is m/c tumor of CPA
Vestibular schwannoma
