Divide the causes of an abdominal mass by abdominal region:
Upper abdomen
- retroperitoneal lymphadenopathy
- abdominal aortic aneurysm
- carcinoma stomach
- pancreatic pseudocyst or tumour
- pyloric stenosis
- carcinoma of the transverse colon
Pelvis
- ovarian tumour or cyst
- uterine: pregnancy, tumour, fibroids
- bladder
Right Iliac Fossa mass
- appendiceal abscess
- carcinoma caecum
- Crohn’s Disease
- pelvic kidney e.g. allograft transplant
- ovarian tumour or cyst
- carcinoid tumour
- amoebiasis
- psoas abscess
- ileocaecal tuberculosis
Left Iliac Fossa mass
- faeces
- carcinoma sigmoid or descending colon
- diverticular phlegmon / diverticulitis
- ovarian tumour or cyst
- psoas abscess
