A rare disease that occurs after allogeneic hematopoietic stem cell transplant and is a reaction of donor immune cells against host tissues. Activated donor T cells damage host epithelial cells after an inflammatory cascade that begins with the preparative regimen.

An abnormality of the hand resulting from contracture of the palmar fascia with a fixed flexion deformity of the metacarpophalangeal (MCP) joints and the proximal interphalangeal (PIP) joints.