{'fraction_non_alphanumeric': 0.026058631921824105, 'fraction_numerical': 0.00760043431053203, 'mean_word_length': 5.633093525179856, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Electron-microscopic study of monophasic spindle-cell synovial sarcomas].

Ultrastructural analysis of 9 monophasic spindle-cell synovial sarcomas revealed both undifferentiated tumour cells and histiocyte-like and fibroblast-like elements. Specialized contacts between tumour cells are found in 8 tumours, formation of the cavities of varying size (including vessel-like structure in 2 cases) in 7 tumours. Other findings included a discontinuous external lamina in 4 tumours; filopodium-like cell protrusions in 5, and spindle-shaped collagen bundles with long striation in 2 cases. The observation of cell contacts and cavities is of a diagnostic importance for monophasic synovial sarcoma. The differential diagnosis of these sarcomas and other spindle-cell tumours is discussed. Ultrastructural findings are interpreted as evidence of the monophasic spindle-cell synovial sarcoma origin from mesenchymal stem cells.