{'fraction_non_alphanumeric': 0.01707317073170732, 'fraction_numerical': 0.0024390243902439024, 'mean_word_length': 6.077586206896552, '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}}
Absent thoracolumbar spine: prenatal sonography of a new lethal skeletal anomaly.

Prenatal ultrasonography has become the most accurate imaging technique for the diagnosis of fetal skeletal anomalies.1 Sonography is particularly useful for predicting the lethal dysplasias. Although numerous types have been described, most lethal dysplasias are accounted for by thanatophoric dysplasia, osteogenesis imperfecta, and achondrogenesis.2 We present a skeletal anomaly most strikingly characterized by the absence of the lumbar and most of the thoracic spine. The initial sonographic diagnosis was a lethal dysplasia, possibly a variant of achondrogenesis. Subsequent evaluation and postmortem studies disproved this hypothesis, however, and failed to establish coincidence with any previously described skeletal dysplasia.