Case contributed by Dr Mohammad Osama Yonso


Painful mass in the lower part of left femur.

Patient Data

Age: 12 years
Gender: Male

There is a bone tumor with wide zone of transition, matrix ossification and aggressive periosteal reaction (Codman triangle - arrow), at the distal of left femur.


Osteoblastic osteosarcoma: Malignant cells producing osteoid (dense, pink, amorphous intercellular material) is the histological hallmark of osteosarcoma.

Courtesy of Dr Mohammad Adib Houreih, Department of Pathology, Tishreen University, Lattakia, Syria

Case Discussion

The radiographic findings in this 12 year old patient are compatible with osteosarcoma.

Osteosarcoma is the second most common primary bone tumor after multiple myeloma:

  • primary osteosarcoma: typically occurs in young patients (10-20 years) with 75% occurring before the age of 20
  • secondary osteosarcoma: occurs in the elderly, usually secondary to malignant degeneration of Paget's disease, extensive bone infarcts or post radiotherapy for other conditions

Most important differential considerations include :

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Case information

rID: 21433
Published: 22nd Jan 2013
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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