Cutaneous presentation of a myxoid cyst occurring at the knee joint

Focal cutaneous mucinosis after knee replacement: A rare entity successfully treated with intralesional polidocanol

“…Treatment of the cyst involved excision of the cutaneous portion and ligation of the visible subjacent connection to the joint space 8 . The presence of multiple cutaneous lesions in our patient made this approach unfeasible; therefore, we chose to obliterate the connection to the synovial space using intracystic injections of polidocanol 1%.…”

“…However, the pathogenesis of cutaneous mucin deposition after joint replacement surgery is still unclear, although several mechanisms have been considered: increased secretion of hyaluronic acid from osteoarthritic joints, local reactive process to foreign body (prosthesis), accidental implantation of the synovial cells at the surgical site, or traumatic damage of the lymphatic system responsible for the drainage and absorption of the synovial fluid 2, 3, 4, 8…”

Digital Mucous Cysts

“…D IGITAL MUCOUS CYSTS (DMCS) are benign myxoid cysts typically involving the lateral or dorsal surfaces of the distal interphalangeal joint (DIPJ) or over the proximal nail fold. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] The cysts present commonly as translucent, rubbery nodules on the fingers (Figure 1) and occasionally on the toes [17][18][19][20] (Figure 2) and are between 3 and 10 mm in size. [21][22][23][24] There is middle and index finger predominance, 23,25 with DMCs occurring more often on the dominant hand.…”