A rare case report of chondroblastoma like soft tissue chondroma and discussion of its benign mimics

Extraskeletal chondromas are rare slow growing benign neoplasms predominantly formed by the hyaline cartilage. These tumors arise from the tenosynovial sheath or the soft tissue adjacent to the tendon sheath. Hands and feet are the most frequently involved sites. Other less frequent sites such as the knee, trunk, oral cavity, pharynx, and the base of the skull have also been reported in the literature. The histomorphology closely resembles a chondroblastoma of the bone. It is extremely important that these benign tumors be differentiated from its other similar looking benign mimcs. To the best of our knowledge, only 12 cases of chondroblastoma like soft tissue chondroma (CLC) have been reported, 11 of which were located in the hand. In this case report, we present a 54-year-old female with a soft tissue swelling over the right hand index finger diagnosed as CLC on core needle biopsy followed by excision.