Written and medically reviewed by: Assoc. Prof. Cengiz Dibekoğlu, MD, General SurgeryLast updated:
Soft Tissue Masses — Retroperitoneal Masses
Tumors behind the abdominal cavity
Retroperitoneal masses sit deep in the abdomen — liposarcoma, sarcoma, and other tumors may present late with vague fullness or pain. Cross-sectional imaging and tumor-board review guide resection planning.
Educational schematic. Some structures may be simplified or emphasized for clarity; not an exact anatomical depiction.
© Cengiz Dibekoğlu — illustrative; not for unauthorized use
Figure summary
This educational figure shows: Retroperitoneal.
Key points
Why they are hard to find early
Deep location allows large size before symptoms. Incidental imaging often discovers them.
Work-up
CT or MRI defines organs at risk. Biopsy may be needed before major resection. Multidisciplinary planning is standard.
- Key note inside
Surgery
En bloc resection may involve kidney, colon, or vessels — experience and volume matter.
Frequently asked questions
Are all retroperitoneal masses cancer?
No, but malignant sarcoma is common enough that expert review should not be delayed.
More chapters in this hub
Lipoma
Benign fatty masses — when to observe or excise
Skin Cysts
Epidermoid and pilar cysts — inflammation, infection, and excision
General Diagnosis
Lipoma and skin cysts — exam, ultrasound, MRI
General Treatment
Lipoma and skin cysts — observation and excision
Moles and Melanoma
Ordinary moles, common myths, and why change matters
Mole Diagnosis
Biopsy, Breslow thickness, and the sentinel node
Melanoma Surgery
Wide excision, sentinel decision, and advanced disease
Liposarcoma
Deep fatty malignancy — not a lipoma
Liposarcoma Diagnosis
MRI, biopsy, and tumor board
Liposarcoma Treatment
Wide excision, radiotherapy, and surveillance
Appointment / info
This page is for education. It is not medical advice and does not replace a visit with your physician.
Medical editor: Assoc. Prof. Cengiz Dibekoğlu, MD · Last medically reviewed: August 2026 · English patient-education chapter.