Endocrine Abstracts

JOINT1644

Introduction: Enchondroma or central chondroma is a benign cartilaginous tumor with development intramedullary characterized by the proliferation of mature hyaline cartilaginous tissue. A tumour of the subject fasting (30-40 years), very common, usually discovered by chance. Solitary enchondroma accounts for nearly 3% of all bone tumors and between 12 and 24% of benign bone tumors. Generally asymptomatic. The scintigraphic aspect of enchondroma lacks specificity and may be a false positive aspect on planar images in a context of searching for secondary bone locations. Objective: The interest of bone scintigraphy in the localization and diagnostic orientation of benign bone tumors and its role in the monitoring of any malignant degeneration.

Materials and Methods: We report the case of a patient referred for an extension assessment of a mammary neoplasia. A bone scan completed with SPECT/CT was performed with a GE NM/CT DISCOVERY 670 Gamma camera.

Results: Standard radiography showed a clear (osteolysis) of the upper end of the tibia (left tibial plate). On the planar scintigraphic imaging, there was a focal hyperfixation focus in the upper epiphyso-metaphyseal region of the left tibia. SPECT/CT slices showed a mixed osteocondensing lesion with osteolysis of the left epiphyseal cartilaginous matrix without periosteal reaction or rupture of the cortical, evoking an enchondrome of the left tibial plateau.

Discussion: The described appearance suggests enchondroma. However, a differential diagnosis with bone infarction cannot be ruled out. Interest of an MRI to establish the diagnosis and eliminate differential diagnoses (bone infarction). In addition, a subsequent scintigraphic check-up is recommended for the follow-up of any sarcomatous transformation

Conclusion: SPECT/CT has allowed a morphological characterization and the anatomical localization of enchondroma and elimination of false diagnosis of secondary bone localization. Bone scintigraphy is of interest during enchondroma where it allows to map the lesions and serves as an initial follow-up examination of any sarcomatous transformation.