Accurate differentiation of retro- or intraperitoneal localization of a primary abdominal tumor by US and CT is often difficult. In our case an abdominal mass was incidentally discovered and identified as a typical benign schwannoma, but with a very atypical location in the mesentery. We found that MRI was a valuable adjunct to CT for exact tumor localization.
We present a case of aneurysmal bone cyst in the jaw investigated with plain film, US, computed tomography (axial, precontrast) and magnetic resonance (1 Tesla, axial T1 weighted before and after Gadolinium administration, axial and coronal T2-weighted after Gadolinium administration). The zygomatic arch is a very rare location for an aneurysmal bone cyst: as far as we know, only a few cases are found in the literature.
The development of bone sarcoma in a patient with Paget disease is a classic but rare event. The authors describe the XR, CT and MR features of an undifferentiated Paget sarcoma arising in the proximal ulna, a very rare location of this tumoral complication. Clinical symptoms, radiological pattern and epidemiology are discussed. In every Paget patient presenting with a new or different pain, with or without mass effect, the radiologist has to search for signs of sarcomatous transformation, i.e. cortical osteolysis, soft tissue mass and sometimes an associated fracture.
We report and discuss a case of a Madelung's deformity seen on a wrist roentgenogram of a young girl who is referred for short stature evaluation, which led to the diagnosis of Léri-Weill syndrome or dyschondrosteosis. The authors stress that it is possible to make an accurate diagnosis on a single standard roentgenogram, at low cost, if the different diagnostic criteria are known.
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