Accesory rib joint
Patient has been operated for gastrointestinal stromal tumor in stomach pathologically proven. . Patient has routine imaging every 6 months with thorax and abdominal CT. Patient has no additional symptoms.
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Extra ''bone'' was detected in axial sections in right side posteriorly during routine control thoracic CT imaging for gastrointestinal stromal tumor. The CT images are examined in coronal sections. Coronal images and MIP images demonstrate that there is an accessory rib joint at the 6th and 7th ribs posteriorly.
The radiologist may misinterpret this appearance as callus formation or extra rib. In such lesions, at least one more section should be examined.