SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.
9 - Grade/differentiation unknown, not stated, or not applicable
Acquired idiopathic sideroblastic anemia
Pure sideroblastic anemia
Refractory anemia with hemochromatosis
Refractory anemia with ring sideroblasts associated with marked thrombocytosis
Refractory anemia with ringed sideroblasts
Refractory anemia with sideroblasts
The peripheral blood may contain a minor population of hypochromic cells but will not show blasts. The bone marrow aspirate smear shows an increase in erythroid precursors with erythroid lineage dysplasia.
People with RA with ring sideroblasts are similar to those with refractory anemia except that many of the red blood cells in the bone marrow contain characteristic ring-shaped iron deposits which are called ring sideroblasts.
For MDS diseases (9980, 9982, 9983, 9985, 9986, 9989, 9991, 9992), abstracting each of the subtypes would result in over-counting of the diseases. 1. Code only the first subtype that is diagnosed. 2. Do not change the histology code or create a new abstract for any subsequent specific MDS subtypes.