Gelatinous bone marrow with vivid fatty cells.

We treated a 78-year-old Japanese man with gastric diffuse large B cell lymphoma. The patient received three courses of chemotherapy and involved-field local radiation therapy to the stomach. Three years after chemotherapy, the patient become sick with anorexia and pancytopenia. He was cachexic, however, levels of vitamin B12, folate, zinc, and copper were normal. His bone marrow revealed focal eosinophilic deposit characterized by mixture of vivid atrophic fatty cells, which was pathologically diagnosed as gelatinous bone marrow. The patient's gelatinous marrow was characterized by CD68-stained vivid atrophic fatty tissue. We found that this finding is a possible alternative marker for gelatinous marrow.