Refractory cytopenias with unilineage dysplasia (RCUD) is a frequent low-risk subtype of myelodysplastic syndrome (MDS; see this term) characterized by refractory cytopenias associated with dysplasia limited to one cell lineage.

An acute condition characterized by sudden visual loss (usually discovered in the morning), optic disc edema at onset, optic disc-related visual field defects. Nonarteritic anterior ischemic optic neuropathy can be associated with flame hemorrhages on the swollen disc or nearby neuroretinal layer, and sometimes with nearby cotton-wool exudates.