Thanatophoric skeletal dysplasiais the most lethal, rare, sporadic birth defect due to de novo mutation in the fibroblast growth factor receptor-3. Clinically this is characterized by shortening of the limbs (micromelia), small conical thorax, flat vertebral bodies and macrocephaly at birth. We encountered a similar case with ultrasonographic findings suggestive of Thanatophoric Skeletal Dysplasia which resulted in the death of the baby within an hour of birth. Almost all cases of this condition have been reported to have died interuterinally or a few days after birth.
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An immunohistochemical study of thanatophoric dysplasia type 1 after fetus autopsy examination.
Congenit Anom (Kyoto)
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Department of Histology and Embryology, Medical School, Faculty of Health Sciences, Aristotle University of Thessaloniki, Greece.
The current case report presents the postmortem examination findings of a 17-week-old female fetus displaying thanatophoric dysplasia type 1 (TD-1) due to a known fibroblast growth factor receptor 3 (FGFR3) gene mutation. Gross and X-ray examination revealed significant abnormalities, including skeletal malformations with prominent TD-1 femur curvature. Microscopical evaluation indicated inadequate histological growth for the gestational age, with specific organ immaturity noted in multiple hematoxylin and eosin sections from internal organs, bone from epiphyses and diaphyses levels.
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Transfusion Medicine, Saveetha Medical College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, IND.
Thanatophoric dysplasia (TD) is a severe and typically fatal skeletal disorder caused by mutations in the FGFR3 gene, often leading to perinatal death. It is characterized by extreme short-limb dwarfism and, occasionally, associated anomalies such as hydronephrosis. Prenatal diagnosis, usually made in the third trimester through ultrasound and genetic testing, is crucial for guiding management decisions.
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Thanatophoric dysplasia (TD) is a rare and severe type of skeletal dysplasia. Typical clinical findings include macrocephaly, shortening of the four limbs, underdeveloped lungs, and thoracic hypoplasia. Neonates with TD develop severe respiratory problems due to thoracic hypoplasia and require respiratory management for survival.
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Bone dysplasias are a broad, heterogeneous group of diseases. Thanatophoric dysplasia is a rare bone dysplasia, but it is the most common lethal skeletal dysplasias. The major role in diagnostics plays a high-quality ultrasound examination in the 2nd trimester and the latest methods of genetic testing, including clinical exome testing.
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