hamartochondromatosis

ham·ar·to·chon·dro·ma·to·sis

(ham-ahr'tō-kon'drō-mă-tō'sis),
Neoplasmlike foci of cartilaginous tissue in sites where cartilage is a normal constituent, but in which the growth of cartilage cells is out of proportion to the other elements of the organ.
[G. hamartion, bodily defect, + chondros, cartilage, + -osis, condition]