PMC9101296_01
(A) Transverse CT and positron emission tomography (PET)/CT (B) images of the large left 9th rib lesion and the subcutaneous nodule (white asterisk). Note the marked avidity of bone associated with the primary bone lesion and the subcutaneous nodule after intravenous administration of flouride-18 fludeoxy glucose (18F-FDG) in the PET/CT image.
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F1
An avid subcutaneous mass separated from the primary rib lesion was identified (Figure 1).
(A) Low magnification microphotograph of the suspected seeded lesion in the subcutaneous tissue. The black box represents the area of increased magnification in B. (B) High-magnification microphotograph of the neoplastic tissue. Areas containing osteoids are marked with asterisks. Tumor cells undergoing mitosis are marked with white arrowheads.
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F2
The histopathology of the subcutaneous nodule showed haired skin and subcutaneous adipose tissue with an inner neoplastic osseous core (Figure 2).