<prompt> Histological features of unicameral bone cysts are-a Blood filled cystic spacesb Endothelial cell liningc Fibrous tissue with cystic spacesd Pseudocyste Single cavity with connective tissue liningabacce  <response>: Unicameral bone cyst is unilocular single cavity cyst with very thin connective tissue lining.The lining of cyst consists of flimsy fibrous tissue, often containing giant cells, osteoclasts.Cyst contains clear fluid. 