Local recurrence of primary central nervous system lymphoma due to tumor seeding

Whole body Positron Emission Tomography-Computerized Tomographic fusion (PET-CT) scan did not show any significant uptake. CT scan of the brain with contrast showed large left parietal glial and intracranial dural enhancing lesions at the region of prior surgical resection consistent with progression. See PDF]Figure 2 A) Hematoxylin and eosin stain section of left parieto-occipital tumor showing diffuse infiltration by large atypical lymphoma cells within the brain parenchyma; B) CD20 immunohistochemical stain revealing strong positive membranous staining in the neoplastic lymphoma cells; C) Wright–Giemsa stain of fine needle aspirate (FNA) cytology of skin nodule in the scalp that developed post–two cycles of chemotherapy showing large lymphoid cells with highly atypical nuclei and moderately abundant cytoplasm; D) Papanicolaou stain of FNA specimen showing markedly atypical/malignant large lymphoma cells with hyperchromatic nuclei.