Cytology. A, Large and atypical lymphoid cells with large nuclei, prominent nucleoli, and basophilic cytoplasm found in the lumbar puncture specimen of a patient later diagnosed with primary intraocular lymphoma. B, Vitreous sample containing large lymphoid cells with large nuclei, prominent nucleoli, and basophilic cytoplasm (Giemsa, original magnifications ×1000 [A] and ×640 [B]).