Table 5.

skeletal distribution of benign and malignant tumours of bone as seen in the Department of Pathology, Faculty of Medicine, Addis Ababa University, 2015-2019

	Skeletal location in percentage (%)
Benign bone tumors	Knee*	Pelvis#	Shoulder girdle	Lower leg	Upper limb	Trunk	Face and skull bone	Jaw bone	Others
Osteochondroma	60%	8%	10%	2%	6%	4%	0%	0%	10%
Chondroma	11%	0%	0%	0%	0%	0%	0%	0%	89%
Chondromyxoid fibroma	100%	0%	0%	0%	0%	0%	0%	0%	0%
Chondroblastoma	0%	0%	100%	0%	0%	0%	0%	0%	0%
Synovial chondromatosis	100%	0%	0%	0%	0%	0%	0%	0%	0%
BPOP	0%	0%	0%	0%	0%	0%	0%	0%	100%
Ossifying fibroma	0%	0%	0%	0%	0%	0%	44%	56%	0%
Fibrous dysplasia	13%	0%	6%	0%	0%	6%	19%	56%	0%
Osteofibrous dysplasia	0%	0%	0%	100%	0%	0%	0%	0%	0%
Non-ossifying fibroma	100%	0%	0%	0%	0%	0%	0%	0%	0%
Giant cell tumor	37%	5%	0%	11%	5%	0%	0%	5%	37%
GCT with ABC	86%	14%	0%	0%	0%	0%	0%	0%	0%
Aneurysmal bone cyst	12.5%	25%	25%	0%	0%	25%	0%	0%	12.5%
Osteoma	0%	0%	0%	0%	0%	0%	100%	0%	0%
Osteoblastoma	100%	0%	0%	0%	0%	0%	0%	0%	0%
Hemangioma	0%	0%	0%	0%	0%	0%	100%	0%	0%
All diagnoses	37%	5%	6%	3%	3%	3%	14%	9%	20%
Malignant bone tumors
Osteosarcoma	72%	9%	8%	0%	4%	2%	0%	5%	0%
Chondrosarcoma	20%	30%	25%	5%	5%	15%	0%	0%	0%
Multiple myeloma	0%	25%	0%	0%	0%	25%	25%	25%	0%
Plasmacytoma	23%	0%	8%	8%	0%	53%	0%	8%	0%
Ewing sarcoma	22%	33%	15%	7%	4%	19%	0%	0%	0%
Angiosarcoma	0%	50%	0%	0%	50%	0%	0%	0%	0%
Chordoma	0%	100%	0%	0%	0%	0%	0%	0%	0%
All diagnoses	52%	16%	11%	2%	4%	10%	1%	4%	0%

Data from 335 primary bone tumours seen at Black Lion Specialized and Teaching Hospital, Ethiopia; *knee tumors include distal femur, proximal tibia and proximal fibula; #pelvis tumors include pelvis and proximal femur locations; shoulder girdle tumors include proximal humerus, clavicle and scapula; trunk includes vertebrae, ribs, sternum etc.; others include ankle joint, short tubular bones of the hands and feet