PMC6906869_01
A crescent shaped, pleural based mass, measuring 6 x 4.9 x 3.8 cm, with some modelling and cortical irregularity of the superior aspect of the left lateral fourth rib as seen on CT.
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fig1
A computed tomography of the chest revealed a crescent shaped, pleural based mass, measuring 6 x 4.9 x 3.8 cm, with some modelling and cortical irregularity of the superior aspect of the left lateral fourth rib suggestive of a long standing process (Figure 1).
(a) Well circumscribed, ovoid mass. (b) Yellow, smooth and glistening cut surface.
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fig2
The cut surface was pale yellow, smooth and glistening (Figures 2(a) and 2(b)).
(a) Spindle cells arranged haphazardly in loose collagenous and pale myxoid stroma (100x). (b) Spindle cells with wavy nuclei (400x).
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fig3
Microscopic examination revealed the tumor to be composed of spindle cells with wavy nuclei arranged haphazardly in loose collagenous and pale myxoid stroma with rare interspersed mast cells (Figures 3(a) and 3(b)).
(a) Tumor cells diffusely positive for S100 protein (200x). (b) Tumor cells showing SOX-10 positivity (200x). (c) CD117 highlighting mast cells (200x). (d) Neurofilament highlighting the trapped axons (200x). (e) Tumor cells negative for STAT6 (100x).
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CD117 highlighted the mast cells (Figures 4(a)-4(e)).