Chondrosarcoma of the first metatarsal-primary or secondary to enchondroma
. Arch Orthop Trauma Surg 1979;95(3):221-5.
The differential diagnosis of hereditary multiple exostoses includes the enchondromatosis, which are a heterogeneous group of syndromes that present with multiple enchondromas
associated with pathological fractures, pseudarthrosis, limb shortening, malignant transformation risk, and scoliosis.
They reported findings consistent with ossified enchondroma
after post-surgical histopathological examination of the dissected material.
Additionally, MRI visualized one hydrocele, one osteoma of the left femur, an enchondroma
of the left superior ramus of the pubic bone, and one dilated left ureter.
The proximal humerus and adjacent soft tissues are the second most likely region in the extremities to contain a neoplastic lesion; the proximal humerus is the third most common long bone (after distal femur and proximal tibia) affected by bone tumor.(3) Sixty percent to 70% of all shoulder tumors occur in the humerus.(5) Cartilaginous lesions of all types (chondroblastoma, enchondroma
, periosteal chondroma, chondrosarcoma) have a predilection for the proximal humerus; marrow cell lesions and metastatic carcinoma are the common malignant lesions.(1) Ten percent to 15% of osseous metastases are in the upper extremity,(4) and of these, 50% will occur in the proximal humerus.(2)
Chondroma, which arises from medullary canal, is called enchondroma
and if it develops from bone surface, it is referred to as periosteal or juxtacortical chondroma.
(Figure 14) is the second-most common benign bone tumor, accounting for 10% of all such lesions.
In cases of enchondroma
or chondrosarcoma, the lesion will most often be bright on T2 sequencing.
 Other benign tumours were chondroblastoma, enchondroma
, osteoma and osteochondroma.
Biopsy of the lesion was consistent with the clinical impression of enchondroma
. Intraoperative and preoperative cultures grew GBS; no bacteria were isolated from blood or urine cultures.
(1,2) We describe the case of a patient with an extremely rare form of generalized enchondromatosis who presented with an enchondroma
of the clivus.
Differential diagnoses of IOG cysts include: aneurysmal bone cyst, osteoblastoma, giant cell tumour, fibrous dysplasia, chondromyxoid fibroma, osteiod osteoma, rheumatoid arthritis, simple bone cyst, enchondroma
, chondroblastoma, and subchondaral bone cyst.