Assertion: hemifacial spasm | /r/CreatedBy | tumor
Facets:
value: rarely
type: DEGREE
Source sentences:
text: Hemifacial spasm is most often caused by a blood vessel touching a facial nerve, but it may be caused by a facial nerve injury or a tumor, or it may not have a cause.
text: It can also be caused by a facial nerve injury or a tumor.
text: Rarely, hemifacial spasm is caused by a tumor pressing on the facial nerve, found with MRI testing.