Multicentric reticulohistiocytosis with prominent skin lesions and arthritis: A case report

Table 1 Comparison of multicentric reticulohistiocytosis and rheumatoid arthritis

	MRH	RA
Joint involvement	Hand joint, knee joint, the shoulder, elbow, hip, ankle, and metatarsophalangeal joint	Double hand joint, wrist joint, foot joint, etc.
	The distal interphalangeal joints involvement is frequent	The distal interphalangeal joints involvement is rare
Rate of joint destruction	Rapid	Slow
Radiologic characteristics	Enlargement of joint cavity	Periarticular osteopenia
	Loss of articular cartilage and resorption of subchondral bone; no bone loss and abnormal new bone formation	Narrowing of the joint space, and bone erosion

MRH: Multicentric reticulohistiocytosis; RA: Rheumatoid arthritis; DIP: Distal interphalangeal; PIP: Proximal interphalangeal joint; MCP: Metacarpophalangeal joints.