Although the enhancement of the intrathecal spinal nerve roots is not specific to Guillain-Barré syndrome and can be seen in neoplasia and other inflammatory processes, the enhancement of only the anterior spinal nerve roots is strongly suggestive of Guillain-Barré syndrome.

A pathologic splenic rupture is rare, occurring primarily in a spleen affected by infective, hematological, and neoplastic disease. To the best of our knowledge, no prior reports of a pathologic splenic rupture due to scrub typhus exist. Intrasplenic pseudoaneurysms and focal infarctions are visible on an initial CT scan. Moreover, the spontaneous splenic rupture occurred a week later. We report a case of nontraumatic-splenic rupture in a patient with scrub typhus.

. A homogeneous mass lesion with similar to lower signal intensity than back muscle is seen in axial T2-(A) and coronal T1-weighted (B) images. Dynamic Gadolinium-enhanced coronal MR images (60 seconds (C) and 5 minutes (D) after contrast injection) show a mass with progressive contrast enhancement from the periphery to the center of the mass. Inhomogeneous and strong enhancement was left until 7 minutes after contrast injection (not shown here). We report a case of calcifying fibrous pseudotumor in the retroperitoneum. This is a rare soft tissue mass lesion with specific radiologic and pathologic findings, and it is the first reported case arising in the retroperitoneum. The CT, MR and angiographic findings are described.

Ordinary lipomas are the most common neoplasm ofmesenchymal origin. About 13% ofthem arise in the head and neck region. especially in the posterior neck. More than 80% of lipomas are ordinary lipoma, and histologically they are composed of mature fat.CT scan provides a definite diagnosis of lipoma in virtually all cases due to their characteristic finding ' a homogenous. well.defined low.atte nuation mass that usually m easures between -65 to -125 HU The authors reviewed the clinical and CT characteristics of 14 cases of lipoma in the neck.The results were as follows:1. A palpable nec k m ass was the most common symptom having a variable duration (months to years). 2. The age distribution of the patients was from 29 to 64 years, and the 6th decade was the most commonly af.

A CT scan can make accurate diagnoses of most thymic masses by assessing their size' shape. and internal ar.ch itectu re and is especially effective in detecting pleural implants. m ediastinal involve ment. and pulmonary paren. chymal invasion in malignant thymoma.The authors analyzed the CT findings of 10 histologically-proven thymic masses from 1983 to 1990 in Yeungnam University Hospital.There were 10 cases of thymic masses in the anterior mediastinum consisting of 6 benign. 3 invasive thymomas . and one thymolipoma. while myasthenia gravis was associated with 2 cases of benign thymomas and with one case of invasive thymomasThe CT findings of the benign thymomas (6 cases) were well-de fin ed. bordered ' round-or oval-shaped masses with a well-preserved fat plane between the thymic mass and m ediastinal great vessels' with no evidence of pleural implants and lung parenchymal invasion The CT findings of the invasive thymomas (3 cases) were irregular. marginated lobular masses with obliteration of the fat plane between the thymic mass and surrounding great vessels' with evidence of local invasion such as extension to A-P window and mass effect to bronchus. Irregular pleural thickening due to pleural metastasis. multip le m etastatic lung parenchymal nodules. and multiple mediastinallymph node e nlargement were also seen in the invasive thymomas.