Liesegang rings are concentric noncellular lamellar structures, rarely seen in vivo, occurring as a consequence of the accumulation of insoluble products in a colloidal matrix. These characteristic structures are a rare phenomenon usually found in association with cystic or inflammatory lesions and may be mistaken for parasites. The authors examined Liesegang rings from an inflammatory kidney l...

To determine the incidence of genetic heterogeneity in primary prostate cancer, we have microdissected 125 tumor and mesenchymal foci from 18 patient biopsies and analyzed the DNA for loss of het erozygosity using PCR microsatellite markers. In 100% of patients with genetic lesions on chromosome Sp, there was evidence for intra tumoral genetic heterogeneity. There was also a low but significant...

INTRODUCTION Tumoral calcinosis is a rare syndrome characterized by massive subcutaneous soft tissues deposits of calcium phosphate near the large joints. The condition has been reported in patients ranging from age 5 months to 83 years (Bostrom et al, 1981; Aprin et al 1986), it usually becomes manifest in the second decade of life (Aprin et al, 1986). Men and non-whites are affected more comm...

The most common gastrointestinal involvement in neurofibromatosis is due to tumoral lesions which may present with gastrointestinal bleeding or obstruction. We report a case of concurrent ulcerative colitis and neurofibromatosis.A 39 year-old woman, known case of neurofibromatosis, was admitted to our department with complaint of chronic bloody diarrhea. After thorough clinical examination and ...

Linear pigmentation of the nail apparatus most reflects longitudinal melanonychia. It results either from simple activation of matrical melanocytes induced by various factors or from benign (lentigo or naevus) or malignant (melanoma) melanocyte hyperplasia. Hematomas and some fungal infections can falsely resemble linear pigmentation. Non-linear pigmented lesions of the nail bed are most often ...

Tumoral calcinosis is uncommon in toddlers, and rare within the subscapular area. Although typically benign, tumoral calcinosis is often incorrectly diagnosed prior to biopsy. We present a case of subscapular tumoral calcinosis in a 16-month old girl and discuss the radiological findings on X-ray, ultrasound, computed tomography and magnetic resonance imaging, including the first description of...

Pancreatic cystic lymphangiomas are rare benign lesions that arise from lymphatic vessels, accounting for less than 0.2% of all pancreatic cysts. Typically it is asymptomatic and discovery occurs during imaging exams for non-pancreatic disease. In the past, a definite diagnosis was made through surgery, with complete resection of all tumoral tissue to prevent recurrence. Nowadays, the developme...

Desmoid-type fibromatosis is an uncommon and aggressive neoplasia, associated with a high rate of recurrence. It is characterized by an infiltrative but benign fibroblastic proliferation occurring within the deep soft tissues. There is no consensus about the treatment of those tumors. We present a surgical series of four cases, involving the brachial plexus (two cases), the median nerve and the...

Purpose. To assess the diagnostic accuracy of dynamic susceptibility contrast-enhanced magnetic resonance imaging (DSCE-MRI) in differentiation between benign and malignant liver lesions by assessment of tumoral perfusion parameters. Methods Materials. Seventy-three patients with known focal liver lesions, including 45 benign (16 FNH, 27 angiomas, and 2 abscesses) and 28 malignant ones (17 meta...