ar muscle involvement)T2d: Nasolacrimal drainage system involvement (?? conjunctival involvement but not including nasopharynx)T3: Lymphoma with pre-septal eyelid involvement (defined above) ?? orbital involvement ?? conjunctival involvementT4: Orbital adnexal lymphoma extending beyond orbit to adjacent structures such as bone and brainT4a: Involvement of nasopharynxT4b: Osseous involvement (inclu