A contrast-enhanced computed tomography (CT) scan revealed a large heterogeneously enhancing well defined soft tissue intra-abdominal mass in left flank and left retroperitoneum
with invasion of left flank muscles suggestive of benign soft tissue tumour with minimal ascites [Figure 1].
is the layer below the outer layer or peritoneum, which is the lining of the abdominal space that covers all our abdominal organs.
Dedifferentiated liposarcoma typically presents in middle-aged and older adults as a large, deep-seated mass.3,8 The most common site is retroperitoneum
, which accounts for approximately half the cases, followed by inguinoscrotal region and thigh.
Even though most commonly found in the retroperitoneum
, (1) up to 6% of liposarcomas occur in the head/neck region.
There are also sporadic reports of GISTs that arise from the peritoneum, omentum, mesentery, and retroperitoneum
(2, 3, 7).
Liposarcomas are tumors that appear to arise from precursors of adipocytes and are most commonly found in the extremities and retroperitoneum
. They can metastasize to pericardium, but a primary liposarcoma in pericardium is very rare and generally has an insidious onset and often presents with complications.
It is now thought that, although they are exceptionally rare, deep soft tissue leiomyomas do in fact exist [1-8] and can occur in somatic soft tissue or in the retroperitoneum
and abdominal cavity.
Metastases have been reported to a number of different sites, including the spine [1-4], skull , rib and vertebra , retroperitoneum
, parametria , appendix , lymph nodes [8, 9], and most commonly the lung .
Urinomas are characterized by urine collections found in the retroperitoneum
, most commonly in the perirenal space caused by urinary tract leakage as a direct result of obstruction, trauma, or postinstrumentation.
Leiomyosarcomas of soft tissue generally present retroperitoneum
; however, it is the predominant sarcoma arising from blood vessels.
Although the preferred site of myxoid, round, and pleomorphic liposarcoma is the extremities, WDL and DDL are common in the retroperitoneum
, accounting for more than 90% of retroperitoneal liposarcomas [2, 8].
In this case, however, appendicitis existing in the retroperitoneum
or spreading to the retroperitoneum
was initially suspected rather than venous thrombophlebitis.