The diagnosis of Ewing's sarcoma requires a multidisciplinary approach. Radiographs may reveal a characteristic 'onion skin' appearance. An indistinct border between the tumor and healthy bone is a common radiological feature in malignant tumors. Magnetic Resonance Imaging (MRI) plays a critical role in diagnosis. If plain radiography and MRI results are insufficient for a definitive diagnosis, Computed Tomography (CT) may be considered. Bone scintigraphy can also provide additional information. Laboratory tests may show anemia and leukocytosis (an increase in white blood cells in the blood). However, the definitive diagnosis of Ewing's sarcoma is established through biopsy. Depending on the tumor's location, a closed (needle) biopsy is generally preferred, but an open biopsy may be necessary in rare cases.