Question:

Which of the following tumors can be most likely confused with fat-forming solitary fibrous tumor?
1. Lipoma
2. Teratoma
3. Liposarcoma
4. Dermoid cyst
5. Melanoma





Answer:

The correct answer for the question "Which of the following tumors can be most likely confused with fat-forming solitary fibrous tumor?" is:

3. Liposarcoma



Explanation
[Taking into account the intimate juxtaposition of fat and the spindle cell component, liposarcoma should be considered as one of the most important on the list, particularly dedifferentiated liposarcoma.]



From the manuscript:
Malignant fat-forming solitary fibrous tumor (lipomatous hemangiopericytoma) in the neck: Imaging and histopathological findings of a case
Radiology Case. 2013 Mar; 7(3):1-7


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From the manuscript

Malignant fat-forming solitary fibrous tumor (lipomatous hemangiopericytoma) in the neck: Imaging and histopathological findings of a case

Free full text article: Malignant fat-forming solitary fibrous tumor (lipomatous hemangiopericytoma) in the neck: Imaging and histopathological findings of a case

Abstract
Fat-forming solitary fibrous tumor (SFT) is a rare variant of solitary fibrous tumor, a mesenchymal fibroblastic neoplasia with a particular branching hypervascular pattern. This tumor is usually classified as benign and only very few fat-forming SFTs with malignant histologic features have been reported. We report a histologically malignant fat-forming solitary fibrous tumor in a 61-year-old man, located in his neck. Ultrasonography examination was first performed showing a heterogeneous lesion, predominantly hyperechoic, with sound beam attenuation, containing two hypoechoic solid nodules. Magnetic resonance imaging and computed tomography examinations demonstrated a heterogeneous and predominantly adipose mass, containing post contrast enhancing solid nodules and thin septations. Treatment consisted of total removal of the lesion. Histologically, the tumor showed hypercellularity, numerous mitoses and cytological atypia, fulfilling the criteria for malignancy. The patient had no metastasis. This rare tumor may be confused with other fat-containing lesions on imaging examinations, mainly liposarcoma.






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1. magnetic resonance imaging

2. MRI

3. helical computed tomography

4. ultrasonography

5. lipomatous hemangiopericytoma

6. malignant solitary fibrous tumor

7. fat-forming


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