?:definition
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Non-material physical anatomical entity of three dimensions, which is generated by morphogenetic or other physiologic processes; is surrounded by one or more anatomical structures; contains one or more body substances or anatomical structures. Examples: celom, thoracic cavity, lesser sac of peritoneum, cavity of right atrium, lumen of aorta, mediastinum, anterior compartment of forearm, intervertebral foramen.
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