[Synovial hemangioma of the knee joint--a rare cause of recurrent hemarthrosis].

In the differential diagnosis of bloody knee joint effusions synovial haemangioma as a rare cause has to be considered. Especially suspicious are long durations of disease with recurrent atraumatic blood-stained joint effusions and repeated episodes of painful limitation of motion, laboratory and radiographic findings often being normal. On the one hand arthroscopy can prove the diagnosis by obtaining an ample biopsy specimen, on the other hand it facilitates the healing of the lesion at the same time by radical removal of the tumour.

[Histiocytosis X. Problems of differential diagnosis in adults].

A now 20-year-old man has been suffering from diabetes insipidus for four years. Two years ago a tumour in the hypophyseal stalk-hypothalamus region had been removed, but no definitive histological diagnosis could be established. When aged 19 he developed cutaneous changes which for the first time led to histiocytosis being suspected.

Exfoliative cytology of multiple endobronchial granular cell tumor.

A multicentric endobronchial granular cell tumor (GCT) in a 50-year-old man was diagnosed by the cytologic study of bronchial lavage specimens. The paraffin-embedded sections contained small clusters of medium-sized round tumor cells that had eccentric nuclei without nucleoli and eosinophilic finely granulated cytoplasm, which was positive with the periodic acid-Schiff stain. These cells were distinguishable from the macrophages and bronchial and squamous cells also found in the specimens.

[Santorinorrhagia as the leading symptom of occult pancreatic cancer].

A case report is presented here on the rare osteoclastoma of the pancreases which was observed in a patient with pancreas divisum. The leading symptom was recurrent bleeding from Santorin's duct (Santorinorrhage).

Pitfall in the CT diagnosis of pulmonary arteriovenous malformation.

A peripheral adenosquamous carcinoma of the right lung with atypical rich vascularization of the central scar was misinterpreted as an arteriovenous malformation based on a chest X-ray examination and a dynamic computed tomographic study.