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The Authors report a rare case of bladder diverticulum with radiological findings compatible with infiltrating bladder cancer and left ureterohydronephrosis. The definitive diagnosis was possible only after surgical intervention with mass removal and histological examination that resulted compatible with bladder diverticulum producing an inflammatory pseudotumor of the wall.

A case of clear cell renal carcinoma metastatic to the thyroid 5 years after surgical removal of the primary tumor is presented. The differential diagnosis related to cyto-histologic findings, the uncommon occurrence and the unpredictable behaviour of clear cell renal carcinoma are discussed.

The angiomyolipoma is a rare tumor of the kidney with benign clinical evolution which can be found in more than half of the female patients with tuberous sclerosis. An uncommon case of renal angiomyolipoma with extracapsular extension, inter-aortocaval lymph node involvement and pulmonary lymphangiomyomatosis with a clinical history of spontaneous recurrent pneumothorax but without the neurological signs of the tuberous sclerosis, is described. The natural history of this disease which has various clinical forms of presentations is still unclear. The role of the lymph-node dissection in the surgical treatment of this tumor is discussed.

The Authors describe a case of intranodal myofibroblastoma presenting in the submandibular region as a firm, indolent and freely mobile rounded nodule of about 3 cm. in diameter. The nature of this uncommon benign lesion is discussed. The observed histological features are partly different from the cases originally described. A proliferation of moderately pleomorphic spindle cells, which are vimentin and muscle specific actin positive, occupies a large part of a lymph node, sharply separated from the normal tissue. The so called "amianthoid fibres" are however absent and the inflammatory cells are almost exclusively eosinophils, mainly localized at the border between the lesion and the residual lymph node. Some spindle cells also show an unexplained positivity for the S-100 protein. In addition, extranodal extension of inflammation with few spindle cells is present. Such a complex picture has many features in common with the inflammatory pseudotumor of lymph node, another benign cause of lymphadenopathy. For this reason, the Authors suggest the possibility that myofibroblastoma is not a true neoplasm, but, together with the inflammatory pseudotumor, a peculiar type or a different stage of an abnormal lymph node reactivity.