Age/sex	Comorbidities	Diagnosis	Enneking stage	Pre-surgical treatment
Case 1	59F	HTN, GORD, hyperparathyroid	Recurrent R thigh UPS, invading medial and posterior compartments	IIB	NAdj RTx, WLE
Case 2	52F	Ehlers Danlos, asthma, PSC, RA	L thigh UPS, invading medial and lateral compartments	IIB	NAdj RTx
Case 3	63M	Femoral neck GCTà femoral neck fracture	R proximal femur giant cell rich osteosarcoma	IIB	Femoral drilling + curette (previous femoral neck GCT), DHS, hemiarthroplasty, NAdj CTx
Case 4	48F	Psoriasis	R acetabular dedifferentiated chondrosarcoma, invading piriformis, abutting gluteal vessels	IIB	Nil