Question

bone scan (scintigraphy) is a useful imaging modality when
a) evaluating soft tissue involvement of a lesion.
b) evaluating direct extension from a primary carcinoma.
c) determining additional sites of osseous metastatic involvement.
d) determining a most likely diagnosis.

Explanation:

Bone scintigraphy (bone scan) is highly sensitive to increased bone turnover, which is characteristic of metastatic bone lesions. It is widely used to detect multiple sites of osseous metastasis across the entire skeleton, as it can visualize areas of abnormal bone activity that may not be apparent on other initial imaging. Options A and B are not optimal uses, as soft tissue evaluation and direct carcinoma extension are better assessed with other modalities like CT or MRI. Option D is incorrect because a bone scan alone cannot provide a definitive, most likely diagnosis, as many conditions can cause abnormal uptake.

Answer:

C) determining additional sites of osseous metastatic involvement.