involving the orbit may require the removal not only of the eye
but of all of the orbital soft tissue as well. The malignancies
may arise within the orbit (e.g., adenoid cystic carcinoma of the
lacrimal gland), or may invade the orbit secondarily (such as advanced
basal cell carcinoma of the eyelid).
infections by Murcormycosis may also be an indication for orbital
mucomycosis. The organisms, identifiable here on routine hematoxylin-eosin
staining, have a tendency to invade into blood vessels, provoking
thrombosis and secondary infarct of soft tissues. Note the non-septate
organisms with wide-angle branching (insert).