Year : 2006 | Volume
: 16 | Issue : 4 | Page : 925--926
Radiological quiz - musculoskeletal
NU Bahri, HP Parekh, SL Chudasama, HH Zalawadia, PV Padhara, N Mittal
Kailash", 35-B, Janata Society, Kamdar Main Road, Jamnagar- 361006, Gujarat, India
H H Zalawadia
Kailash«DQ», 35-B, Janata Society, Kamdar Main Road, Jamnagar- 361006, Gujarat
|How to cite this article:|
Bahri N U, Parekh H P, Chudasama S L, Zalawadia H H, Padhara P V, Mittal N. Radiological quiz - musculoskeletal.Indian J Radiol Imaging 2006;16:925-926
|How to cite this URL:|
Bahri N U, Parekh H P, Chudasama S L, Zalawadia H H, Padhara P V, Mittal N. Radiological quiz - musculoskeletal. Indian J Radiol Imaging [serial online] 2006 [cited 2020 Jan 19 ];16:925-926
Available from: http://www.ijri.org/text.asp?2006/16/4/925/32386
A 17 year old girl presented with bowing of left leg and NO complaint of pain. Past history of fracture of tibia of same side before 7 years. Roentgenogram [Figure 1] was taken and then computed tomography [Figure 2],[Figure 3] was done with 5mm contiguous axial scans. What is your diagnosis?
View AnswerOSSIFYING FIBROMA
Ossifying Fibroma of the tubular bones are rare, being first reported by 'Kempson' in 1966 ,. Predominant involvement of tibia and to a lesser extent fibula has been emphasized in all the reports. Rare sites of Ossifying Fibroma are the ulna, radius, humerus, metatarsals & phalangeal bones ,. Diaphyseal location is typical, especially middle third of tibia although some may extend into the metaphysis. Involvement of distal diaphyseal segment of fibula is also characteristic. In tibia the lesion is usually located in anterior aspect of bone, apparently banging as intracortical tumour and subsequently involves spongiosa. More than one bone may be involve simultaneously or metachronously ,.
Ossifying Fibroma of tubular bones generally seen in first or second decade of life, with the boys & girls affected with equal frequency with the painless enlargement bowing of bones. 
In the tibia slight or moderate anterior or anterolateral bowing is the rule. Intracortical osteolysis clearly marginated by a band of sclerosis may be seen as a single confluent lesion or multiple elongated bubble like areas . The tumour itself-varies from 1 to 10 cm. In its maximum dimension, on section the tumour is found to be located eccentrically and to bulge from the cortex into the medullary cavity, but rarely extend to involve the complete circumference of the bone. In the fibula however, the entire width of the bone is involved. The tumour appears well demarcated from adjacent uninvolved bone by thin band of sclerosis .
The radiological feature of Ossifying Fibroma in the tubular bones most resembles those of the fibrous dysplasia but the monostotic fibrous dysplasia commonly affects patients in second and third decade of life and in addition to the tibia, frequently involves the rib, femur, facial bones or skull . The major point of difference between ossifying fibroma and fibrous dysplasia, histologically is the lack of osteoblastic rimming on the metaplastic trabecula in the fibrous dysplasia .
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