★ An abdominal mass refers to an abnormal, space-occupying growth, the nature of which requires thorough evaluation to determine its
origin, composition, and clinical significance. These masses can arise from a wide range of causes, including congenital malformations, infections, benign or malignant neoplasms, hematologic disorders, vascular abnormalities such as aneurysms, and trauma. Systemic conditions like tuberculosis, lymphoma, or other inflammatory diseases may also present as abdominal masses. Such growths can displace, compress, infiltrate, or impair the function of nearby organs and structures, leading to symptoms such as pain, distention, intestinal obstruction, urinary retention, or weight loss, depending on their size and location.
★ Abdominal masses can be categorized based on their anatomical location into three primary types:
1. Intraperitoneal – arising from structures within the peritoneal cavity such as the liver, spleen, gastrointestinal tract, or reproductive
organs.
2. Extraperitoneal – occurring outside the peritoneal cavity, either retroperitoneal (e.g., kidneys, adrenal glands, pancreas, lymph
nodes) or pelvic (e.g., reproductive organs, bladder, rectum).
3. Abdominal wall – originating from the musculature, fascia, or subcutaneous tissues of the abdominal wall.
★ Further diagnostic evaluation relies heavily on advanced imaging techniques, which play a pivotal role in determining the mass’s location,
size, composition, and relationship to adjacent structures. These techniques include:
1. Ultrasound (US): Often the initial imaging modality due to its non-invasiveness and ability to differentiate cystic from solid lesions.
2. US-guided core needle biopsy: Essential for obtaining tissue samples to confirm malignancy or infection.
3. CT scans with contrast: Provide detailed cross-sectional images, helping to identify vascular involvement, organ displacement, or
metastasis.
4. MRI: Particularly useful for soft tissue characterization, assessing pelvic masses, or distinguishing benign from malignant lesions. ○ PET scans: Used for evaluating metabolic activity, staging cancers, and detecting distant metastasis.
★ In some cases, additional laboratory tests, such as tumor markers (e.g., CA-125, AFP, CEA) or blood cultures, may be warranted to aid
diagnosis, especially when cancer, infection, or systemic conditions are suspected.
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