Large multi-loculated peripherally rim enhancing collection at the subcutaneous tissue of left gluteal region with extension to involve the left gluteal medius, left gluteal minimus, left illiacus, lateral aspect of abdominal wall muscles and superiorly into the left psoas muscle. Extension into the left posterior pararenal space which causes significant anterior displacement of other left retroperitoneal spaces. Anterosuperiorly, the collection extends into the left perinephric space, abutting and displacing the left kidney. No air pocket, fat component, solid component or calcification within collection.
Marked fat streakiness surrounding this collection as well as thickening of left pararenal fascia and perinephric fat.
A few enlarged abdominal lymph nodes at the preaortic and left paraaortic region,
The adjacent bone (pelvis bone and vertebrae) are intact, without bony erosion or aggressive periosteal reaction. No intraspinal extension of this collection.
Left moderate hydronephrosis and proximal hydroureter secondary to proximal ureteric calculus. The left kidney is small and hypoenhancing suggestive of chronicity of obstructive uropathy. The proximal left ureteric wall is thickened and enhancing.
Long segment of central filling defects (20-40HU) at the right lower lobe pulmonary artery and its segmental branches, as well as subsegmental branches of posterobasal segment left lower lobe pulmonary artery. Minimal subpleural atelectasis at the posterobasal segment of right lower lobe. No pleural effusion bilaterally.