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Bone Hydatid Disease
This document summarizes key information about hydatid disease from a medical textbook chapter on bone and joint infections. Hydatid disease, also known as echinococcosis, involves infection by the larval stage of the tapeworm Echinococcus. It most commonly affects the liver and lungs. Rarely, it can spread to bones, preferentially infecting the spine, long bones, and vertebrae. In bones, the enlarging cysts absorb bone and spread along the medulla, causing osteolytic lesions that become well-defined over time. Imaging plays an important role in diagnosis, showing characteristic multiloculated, osteolytic lesions with well-defined borders and possible calcification. Differential diagnosis includes aneurysmal
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Bone Hydatid Disease
- 1. Textbook of Radiologyand Imaging 7th Edition,Volume 2, page 1174 CHAPTER 36: Periostal Reaction; Bone and Joint Infections; Sarcoid HYDATID DISEASE Presented by :Yessi Oktiari Consultant : dr.Yana Supriatna, Ph.D, Sp.Rad (K) RI Presented on : October 3rd 2017
- 2. CHAPTER 36 : PeriostalReaction; Bone and Joint Infections; Sarcoid • Periosteal New Bone • Infection • Sarcoidosis • Rare Bone Infections • Brucellosis • Actinomyosis • Hydatid Disease (Echinococcus)
- 3. larval stage the liverand lung richly vascularized areas vertebrae and long bones spine adulthood no pathognomonic Less than 2% of affected patients is bone involved Sheep farming areas
- 5. well-defined, multiloculated osteolyticlesion uncommon The enlarging cysts in bone absorb trabeculae, spread along the medulla, thinning the cortex, expanding the bone Later, the cystic lesions become well defined, fibrous dysplasia may be simulated in long bones
- 6. best method • Aneurysmalbone cyst, giant cell tumor and fibrous dysplasia Arkun R, Mete BD. Musculoskeletal Hydatid Disease. Semin Musculoskelet Radiol. 2011;1(212):527–40. Kural C et al. Hydatid bone disease of the femur. Orthopedics 2008 Jul;31(7):712.
- 7.
- 10. multiloculated, osteolytic, and expansilelesion osteolytic lesion with well- defined borders calcification
- 11. L5 vertebrae hypointense leftpedicle (arrow) transverse process (open arrow) well-defined hypointense soft tissue mass paraspinal muscle hypointensity detachment of membrane (arrow)
- 12. L5 multiloculated cystic posteriorto the L5 nerve root (open arrow) left psoas muscle (arrow) hyperintense, well-defined septated cystic masses pedicle and posterior paraspinal soft tissue medullary canal
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- 14. Giant CellTumor AneurysmalBone Cyst Fibrous dysplasia • Lesion with multinucleated giant cells • GCT is also included in the differential diagnosis of an ill- defined osteolytic lesion, provided the age and the site of the lesion are compatible. Discriminators : • Epiphyses must be closed • Must be an epiphyseal lesion and abut the articular surface • Must be well-defined and non- sclerotic margin • Must be eccentric • Solitary expansile well- defined osteolytic bone lesion, filled with blood • ABC can occur almost anywhere in the skeleton Discriminators : • Must be under age 30 • Must be expansile • In general FD is lytic and well- defined, but can look like almost anything • FD may also contain cystic parts, calcifications and ossifications • Mostly found in children and young adults, but sometimes as coincidental finding at older ages Source : http://www.radiologyassistant.nl