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case_images: A calcified mass overlying the topography of the mediastinum was revealed in the examined cat. (a) A lateral thoracic radiograph reveals dilation of the cervical esophagus (white arrow) and the presence of a calcified mass (black arrow). (b) A ventrodorsal radiograph shows the mass
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case_images: However, the radiographs revealed a calcified mass overlying the topography of the cranial mediastinum and dilation of the esophagus due to a soft tissue density consistent with ingesta (Figure 1).
case_images: (a-d) Thoracic computed tomography (sagittal and dorsal multiplanar reconstruction and rendering volume) revealed a heterogeneous mass with bone density. The mass was found to originate in the second left rib with esophageal and tracheal compression
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case_images: Restricted expansion of the apical lobe of the left cranial lung lobe was also observed, with no evidence of edema, masses or lung metastasis (Figure 2).
case_images: An intraoperative photograph the rib mass resection performed. (a) The rib mass was observed after an incision in the skin was made. (b) The lateral thorax was entered at the proposed intercostal space of the excision and the mass was not found to be adherent to any of the intrathoracic structures. (c) A polypropylene mesh was used to reconstruct the defect after resection of the chest wall. (d) The rib mass (osteoma) measured 5.0 x 3.5 x 4.2 cm3
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case_images: The mass was not adherent to intrathoracic structures (Figure 3), and four ribs were resected.
case_images: Transient Horner's syndrome was observed (a) 24 h and (b) 7 days after surgical resection of the rib osteoma
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case_images: Horner's syndrome was observed immediately in the left eye after recovery from anesthesia (Figure 4).
case_images: (a and b) Plain radiographs and (c) photograph of the cat obtained 2 years after rib osteoma surgery
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case_images: In plain radiographs obtained 2 years after surgery, there was no evidence of esophageal dilation or recurring osteoma (Figure 5).