Low-Grade Central Osteosarcoma: A Difficult Condition to Diagnose
Figure 3
A histological example of LGCO: macroscopically, this greyish white tumour shows extramedullary extension (a). Microscopic review (haematoxylin and eosin stain, ×10) demonstrates (b): low-grade intramedullary osteosarcoma, which consists of parallel seams surrounded by spindle cell stroma which exhibits very minimal cytological atypia. The appearances are similar to parosteal osteosarcoma or fibrous dysplasia, for which it can be mistaken.
