{'fraction_non_alphanumeric': 0.020948180815876516, 'fraction_numerical': 0.0, 'mean_word_length': 5.305555555555555, '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}}
Epithelioid cell variant of renal angiomyolipoma

Angiomyolipoma is considered by many authors to be a hamartoma, occurring in a sporadic form or in association with tuberous sclerosis. The lesion may be solitary or multicentric, and may involve extrarenal sites such as lymph nodes, liver or spleen. Almost always the clinical course is benign. Microscopically, the lesion consists of thick-walled blood vessels, smooth muscle in a poorly organized pattern, and mature adipose tissue in varying amounts. In spite of its characteristic microscopic appearance, the lesion may be mis-diagnosed as a sarcoma due to a large tumour size, cellular atypia, mitotic activity and tumoral necrosis. We report a case of angiomyolipoma consisting almost entirely of epithelioid cells, with numerous multinucleated tumour giant cells. The case mimicked renal cell carcinoma in both its clinical and pathological aspects.