PMC5786217_01
Axial view of chest CT showing left lower lobe lesion.
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Of note, she was diagnosed with a biopsy proven squamous cell cancer of her left lower lobe 4 months earlier (Fig. 1).
PET-CT showing FDG uptake in left lower lobe.
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A PET scan performed just three weeks prior to her presentation demonstrated significant FDG uptake in the left lower lobe as well as the cecum, with no convincing evidence of regional nodal disease in the lungs (Figs 2 and 3). 
PET-CT showing FDG uptake in cecum.
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A PET scan performed just three weeks prior to her presentation demonstrated significant FDG uptake in the left lower lobe as well as the cecum, with no convincing evidence of regional nodal disease in the lungs (Figs 2 and 3). 
Abdominal CT scan showing annular cecal mass with evidence of perforation.
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A CT scan demonstrated a 4.3 cm annular mass within the cecum, suspicious for a primary colonic malignancy, as well as an 8.6 x 8.2 cm2 lobulated gas-containing abscess with extension in to the lateral abdominal wall (Figs 4 and 5). 
Coronal view of abdominal CT scan showing cecal mass with evidence of perforation.
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A CT scan demonstrated a 4.3 cm annular mass within the cecum, suspicious for a primary colonic malignancy, as well as an 8.6 x 8.2 cm2 lobulated gas-containing abscess with extension in to the lateral abdominal wall (Figs 4 and 5). 
Carcinoma involving colonic serosa (image courtesy Dr Maisoun Abdelbaqi, Department of Pathology, Red Deer Regional Hospital, Alberta, Canada).
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After extensive histopathology review, the cecal mass was confirmed to be an invasive squamous cell carcinoma of lung origin (Fig. 6).