PMC5433670_01
Sagittal image of abdominal ultrasound showing right infrarenal hypoechoic mass.
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A 51-year-old Caucasian male was found to have an incidental hypoechoic, solid appearing 8.2 x 7.6 x 7.8 cm mass arising off the inferior pole of the right kidney on abdominal ultrasound during evaluation for a history of alcoholism (Figure 1).
Axial image of contrast enhanced computed tomography of abdomen and pelvis showing a large cystic mass inferior to the right kidney with small calcifications.
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A computerized tomography (CT) scan of the abdomen and pelvis with contrast revealed a large cystic mass lying inferior to the lower part of the right kidney measuring about 8.6 x 8.3 cm2 in diameter (Figures 2 and 3).
Coronal image of contrast enhanced computed tomography of abdomen and pelvis showing the cystic mass adherent to the psoas muscle.
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A computerized tomography (CT) scan of the abdomen and pelvis with contrast revealed a large cystic mass lying inferior to the lower part of the right kidney measuring about 8.6 x 8.3 cm2 in diameter (Figures 2 and 3).
CT-guided biopsy of the mass.
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A CT-guided aspiration and biopsy of the cystic mass were then attempted; however, the specimen collected was unsatisfactory (Figure 4).
(a) Specimen received in formalin with pale yellow greasy material floating; (b) cyst wall containing the sebaceous material; (c) aggregates of the sebaceous material; and (d) few strands of entrapped hair from the cyst contents.
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The cyst was filled with pale yellow greasy material with entrapped hair (Figure 5).
Cyst wall lined by stratified squamous epithelium.
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The cyst contents comprised acellular keratinous material along with fragments of hair shafts (Figures 6-8).
Cyst contents showing acellular keratinous material and a hair shaft.
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The cyst contents comprised acellular keratinous material along with fragments of hair shafts (Figures 6-8).
Fibrous cyst wall with focal calcification.
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The cyst contents comprised acellular keratinous material along with fragments of hair shafts (Figures 6-8).