Osteoid osteoma of the rib: A report of two cases

Abstract

Osteoid osteoma is type of benign bone tumor, characterized by a well-demarcated core with a typical size of <1 cm and by a distinctive surrounding zone of reactive bone formation. The tumor can occur anywhere in the cortex or medulla of the skeleton. However, the lesion usually affects the long bones of the lower extremities. The present study describes two cases of osteoid osteomas located in the rib.

Keywords: osteoid osteoma; rib; tumor.

Figure 1

X-ray image at anteroposterior view revealing the presence of a lesion at the tenth right rib.

Figure 2

(A) Computed tomography revealing the nidus and central calcification. (B) Three dimensional reconstructed view revealing a lesion located at the visceral side of the rib.

Figure 3

Bone scintigraphy revealing intense uptake at the site of the lesion.

Figure 4

Lesion was located during surgery using a C-arm fluoroscopic device.

Figure 5

(A) Specimen with the lesion at the visceral side. (B) The cross-section view revealing the location of the lesion in the cortex.

Figure 6

Photomicrograph revealing osteoid tissue in a background stroma of fibrovascular tissue (stain, hematoxylin and eosin; magnification, ×100).

Figure 7

Computed tomography revealing the location of the lesion at the top of sixth right rib.

Figure 7

Computed tomography revealing the location of the lesion at the top of sixth right rib.

Figure 8

X ray revealing the presence of scoliosis in the spine plain film.

Figure 9

Intra-operative three dimensional C-arm-based navigation system was used to locate the tumor.

Figure 10

Photomicrograph revealing interconnecting trabeculae of woven bone lined prominently by osteoblasts (stain, hematoxylin and eosin; magnification, ×200).