PMC9935971_01
Rib osteochondroma, presented as hard breast lump in a 23-year-old male.. A-C. Chest PA (A) shows irregular, radiodense bony outgrowth overlying the anterior aspect of the right fourth rib (arrow). Contrast-enhanced CT axial mediastinal window (B) shows an irregular bony outgrowth arising from the anterior costochondral junction, aspect of the right fourth rib, uplifting the pectoralis major muscle anteriorly. Bone window axial (C) image shows the continuity of the bony outgrowth with the underlying rib medullary cavity.. D-F. Volume rendered technique axial and sagittal images (D, E) depict the bony outgrowth (arrows) from the right fourth rib. The shaded surface display (F) image shows swelling in the right chest, just below the nipple.
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F1
Antero-posterior and lateral chest radiographs showed a lobulated bony outgrowth from the right 4th rib anteriorly (Fig. 1A). Reconstructed 3D volume rendered technique (VRT) images in various planes showed bony growth in direct continuity with the underlying rib (Fig. 1B-F) confirming the diagnosis of osteochondroma.