Radio-Pathologic Workup of a Retroperitoneal Abdominal Mass
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1 Radio-Pathologic Workup of a Retroperitoneal Abdominal Mass Joe Carlson Advanced Radiology Clerkship Harvard Medical School Year IV September 12, 2002
2 84 year old Male Presented to PCP With Abdominal Pain HPI: Dull ache in abdomen. Good appetite. Weight loss of 3-4 lbs. Denies fever/chills. PMH: prostate ca. s/p XRT MEDS: Tylenol, Atrovent PE: VS WNL GEN: WDWN NAD ABD: soft, NT, ND An outpatient abdominal CT was ordered. Indication: Abdominal pain 2
3 Initial Screening CT Abdomen and pelvis with contrast revealed large mass with soft tissue density. 3
4 Initial Screening CT ADJACENT TO CELIAC TRUNK, AORTA SIZE: 7.1 X 10 cm 4
5 Initial Screening CT SIZE OF MASS 2: 1.4 X 4.2 cm 5
6 Initial Screening CT PANCREAS AND SPLENIC ARTERY DISPLACED ANTERIORLY 6
7 Our Patient: Coronal CT 7
8 Our Patient: Coronal CT 8
9 Our Patient: Coronal CT 9
10 Now what!? Initial report labeled this mass as arising from the left adrenal. Given size and heterogeneity, malignant neoplastic process most likely. DDx: Metastases, adrenal carcinoma, renal lymphoma, sarcoma Abdominal MR ordered Looking for T2 enhancement, further definition of anatomy. 10
11 Our Patient: Abdominal MRI MR FINDINGS 7 DAYS LATER DISPLACED L ADRENAL GLAND IDENTIFIED. AREAS OF NECROSIS WITHIN MASS. ENCASES PROXIMAL SMA. BOTH MASSES IDENTIFIED, BOTH HAD EQUAL SOFT TISSUE CHARACTERISTICS. DDx: SARCOMA, LYMPHOMA, PARAGANGLIOMA, METASTASES CT GUIDED BX IF CLINICALLY INDICATED. 11
12 Fighting for a Tissue Diagnosis CT guided Bx performed 12 days after initial CT. Hypocellular FNA revealed scattered spindle cells, some highly atypical. Core needle Bx revealed atypical spindle cells, S-100, LCA and actin negative, vimentin positive. 12
13 Histopathology NEGATIVE FOR: S-100, a marker for neural crest lineage, positive in nerve sheath cells and melanocytes. LCA, a marker for lymphoma. Actin, a marker for muscle cells, whether smooth muscle or skeletal. POSITIVE FOR: Vimentin, a marker for mesenchymal cells, including sarcomas, lymphoid cells, endothelial cells, fibroblasts, and smooth muscle cells as in melanocytes and Schwann cells. 13
14 Some sort of Spindle Cell Sarcoma Surgical resection with wide margins, if possible. Exploratory laparotomy performed 2 months after initial CT. Found tumor to be highly vascular, involving left renal vein. Dissection and mobilization not possible. Further biopsy performed. 14
15 Spindle Cell Subtype of Liposarcoma 15
16 Spindle Cell Subtype of Liposarcoma Slight staining of adipocytes with S-100. No lipoblasts seen on histology. Further staining with desmin, MART-1, HMB-45 and actin negative. Not a perfect histologic diagnosis but liposarcoma most likely given full clinical, radiologic and pathologic picture. 16
17 Prognosis Well-differentiated liposarcoma has no metastatic potential. Local recurrence likely in 46-57% of cases in one series, even with clean margins. In this case tumor is inoperable. Sadly, for this pt, further CT scans have showed increasing tumor growth. Currently no treatment option available. 17
18 Our Patient: Follow up Abdominal CT CURRENTLY 13 X 20 cm SMA NEARLY OCCLUDED AORTA ENCASED SPLENIC ARTERY DRAPED OVER TUMOR. L PLEURAL EFFUSION. 18
19 Acknowledgements BIDMC Radiology Staff and Residents Dei Tos AP, Mentzel T, Newman PL, Fletcher CDM. Spindle cell liposarcoma: a hitherto unrecognised variant of well-differentiated liposarcoma : analysis of six cases. American Journal of Surgical Pathology 1994;18:
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