<prompt> Block veebrae are seen in ?Pagets diseaseLeukemiaTBKlippel - Feil syndrome  <response>: Ans. is i.e., Klippel - Feil syndrome A block veebra is a type of veebral anomaly where there is a failure of separation of two or more adjacent veebral bodies Associations There is a frequent association with hemiveebrae absent veebra above or below block level, posterior element fusion Fusion of multiple cervical veebral bodies is also seen in Klippel-Feil syndrome and VACTREL anamoly. 