Ae Kyung Jeong

MR imaging of solitary fibrous tumors in the head and neck.

Objective Solitary fibrous tumor (SFT) is a very rare tumor. The purpose of this study is to determine the MR imaging features of SFT in the intracranial and extracranial head and neck regions. Materials and Methods We retrospectively reviewed six MR images and two CT images of six histologically proven cases of SFT that occurred in four men and two women, and their ages ranged from 46 to 59 years. These imaging findings were correlated with the microscopic findings of their surgical specimens. Results Six SFTs arose in the meninges (the petrous ridge and the pituitary fossa), the parotid gland, the parapharyngeal space, the buccal space and the maxillary sinus. On the MR images, SFTs in the intracranial and extracranial head and neck regions were mostly isointense to the muscle on the T1-weighted images, they were hyperintense on the T2-weighted images and they all had intense enhancement. On the T1- and T2-weighted images, hypointense lines were observed within in five SFTs. On the CT images, the SFTs were hypodense to the muscle on the unenhanced images and they were heterogeneously enhanced on the contrast-enhanced images. An exceptional case of pituitary SFT was hypointense on the T2-weighted images and it was hyperdense on the unenhanced CT images, which correlated with the increased collagenous component and the cellular compactness. Conclusion The imaging features of SFT are nonspecific; however, SFT should be included in the differential diagnosis of masses involving the intracranial and extracranial head and neck regions.

Inflammatory Pseudotumor (Myoblastic Tumor) of the Genitourinary Tract

OBJECTIVE The purpose of this article is to describe imaging features of the following genitourinary tract locations that can involve inflammatory pseudotumor: kidney, adrenal gland, retroperitoneum or pelvis, bladder, and other rare locations. CONCLUSION Although definite radiologic differentiation from malignancy is not clearly possible, we suggest that familiarity with the manifestations of inflammatory pseudotumor can help avoid unnecessary radical surgery before histopathologic proof of malignancy is obtained.

Subcutaneous panniculitis-like T-cell lymphoma: US and CT findings in three patients

Subcutaneous panniculitis-like T-cell lymphoma (SPTCL) is a rare disorder. We examined two females and one male with multiple soft-tissue masses in the abdominal wall. One of these three patients also had soft-tissue masses in the right thigh and right buttock. The histologic diagnosis was revealed as SPTCL in all three cases. The ultrasound (US) findings in two of these cases were diffuse, ill-defined hyperechoic areas with a linear vascular signal. The findings of the abdominal and pelvic computed tomography (CT) scanning with contrast enhancement were multiple enhancing nodules with an infiltrative pattern of peripheral subcutaneous fat layer in all three cases. We report US and CT findings of SPTCL in these three patients.

Evaluation by Contrast-Enhanced MR Imaging of the Lateral Border Zone in Reperfused Myocardial Infarction in a Cat Model

Objective To identify and evaluate the lateral border zone by comparing the size and distribution of the abnormal signal area demonstrated by MR imaging with the infarct area revealed by pathological examination in a reperfused myocardial infarction cat model. Materials and Methods In eight cats, the left anterior descending coronary artery was occluded for 90 minutes, and this was followed by 90 minutes of reperfusion. ECG-triggered breath-hold turbo spin-echo T2-weighted MR images were initially obtained along the short axis of the heart before the administration of contrast media. After the injection of Gadomer-17 and Gadophrin-2, contrast-enhanced T1-weighted MR images were obtained for three hours. The size of the abnormal signal area seen on each image was compared with that of the infarct area after TTC staining. To assess ultrastructural changes in the myocardium at the infarct area, lateral border zone and normal myocardium, electron microscopic examination was performed. Results The high signal area seen on T2-weighted images and the enhanced area seen on Gadomer-17-enhanced T1WI were larger than the enhanced area on Gadophrin-2-enhanced T1WI and the infarct area revealed by TTC staining; the difference was expressed as a percentage of the size of the total left ventricle mass (T2= 39.2%; Gadomer-17 =37.25% vs Gadophrin-2 = 29.6%; TTC staining = 28.2%; p < 0.05). The ultrastructural changes seen at the lateral border zone were compatible with reversible myocardial damage. Conclusion In a reperfused myocardial infarction cat model, the presence and size of the lateral border zone can be determined by means of Gadomer-17- and Gadophrin-2-enhanced MR imaging.

Supratentorial gangliocytoma mimicking extra-axial tumor: a report of two cases.

We report two cases of supratentorial gangliocytomas mimicking an extra-axial tumor. MR imaging indicated that the tumors were extra-axial, and meningiomas were thus initially diagnosed. Relative to gray matter, the tumors were hypointense on T1-weighted images and hyperintense on T2-weighted images. On contrast-enhanced T1-weighted images, homogeneous enhancement was observed, while CT scanning revealed calcification in one of the two cases.

Lymphoepithelioma-Like Carcinoma of the Breast

Lymphoepithelioma-like carcinomas (LELCs) are tumors that have similar histopathologic features to those of nasopharyngeal lymphoepithelioma, and they occur in different organs outside the nasopharynx, such as the stomach, lung, salivary gland, larynx, thyroid, and uterine cervix. 1 Lymphoepithelioma-like carcinoma of the breast is extremely rare and is a newly recognized subtype of breast carcinoma. 2 It has an infiltrating pattern similar to that of lobular carcinoma. 3,4 To the best of our knowledge, no case of LELC of the breast has been described in the radiology literature. We therefore report a case of LELC of the breast as well as the radiologic and histologic findings and a literature review.

Primary Neuroendocrine Carcinoma of the Breast Involving the Nipple- Areolar Complex

Primary neuroendocrine (NE) carcinomas of the breast are tumors that have morphologic features similar to those of NE tumors of both the gastrointestinal tract and the lung. They express NE markers in more than 50% of the cell population. 1 Although NE carcinomas can develop in many sites of the body, primary NE carcinomas of the breast are very rare, and to our knowledge, no case described in the radiologic literature has involved the nipple-areolar complex. We present our experience with a primary NE carcinoma of the breast involving the nipple-areolar complex and also describe the radiologic and histologic findings.

Imaging features of bilateral breast abnormalities

There are various-causes, broad-spectrum, heterogeneous groups with various biologic profiles, and imaging features of bilateral breast abnormalities. As imaging modalities continue to be developed, the ability to detect subtle or tiny abnormalities is improved in the contralateral breast of patients already diagnosed with unilateral breast disease, especially in breast cancer patients when using magnetic resonance imaging. Furthermore, some diseases involved bilateral breast, simultaneously. The purpose of this review is to describe imaging features of the bilateral breast abnormalities-common diseases and simultaneously involving diseases. In order to provide adequate treatment and to prevent misdiagnosis, a complete understanding of the imaging and clinical features of bilateral breast abnormalities of common diseases as well as those of simultaneously involving diseases is necessary.