SPRINGFIELD CYTOLOGY LABORATORY
Fluid Cytology Report
Patient: Robert Chen
MRN: MRN003
Date of Procedure: November 22, 2024
Date of Report: November 25, 2024
Specimen: Peritoneal fluid (ascites)
CLINICAL HISTORY:
56-year-old male with metastatic colorectal cancer on chemotherapy. New-onset
ascites identified on recent CT imaging. Diagnostic paracentesis performed.
GROSS DESCRIPTION:
Received 500 mL of straw-colored, slightly turbid peritoneal fluid in sterile
container. Fluid processed for cytological examination and cell block preparation.
MICROSCOPIC DESCRIPTION:
Cytospin preparations and cell block sections show numerous three-dimensional
clusters and sheets of malignant epithelial cells in a background of mesothelial
cells, lymphocytes, and macrophages.
The malignant cells display:
- Enlarged hyperchromatic nuclei with irregular nuclear contours
- Prominent nucleoli
- Increased nuclear to cytoplasmic ratio
- Moderate eosinophilic cytoplasm
- Occasional glandular/acinar formation
Background shows reactive mesothelial cells with no evidence of atypia.
No microorganisms identified on Gram stain.
IMMUNOHISTOCHEMISTRY (Cell Block):
CK20: Positive (diffuse)
CDX2: Positive
CK7: Negative
Calretinin: Negative in malignant cells (positive in mesothelial cells)
CEA: Positive
The immunophenotype is consistent with colonic/lower GI tract origin.
DIAGNOSIS:
PERITONEAL FLUID, PARACENTESIS:
- POSITIVE FOR MALIGNANT CELLS
- CONSISTENT WITH METASTATIC ADENOCARCINOMA
- MORPHOLOGY AND IMMUNOPROFILE COMPATIBLE WITH COLORECTAL PRIMARY
COMMENT:
The cytologic findings confirm malignant ascites in this patient with known
metastatic colorectal carcinoma. The presence of tumor cells in peritoneal
fluid indicates peritoneal involvement, though no discrete peritoneal masses
were identified on recent CT imaging. This represents disease progression.
Clinical correlation is recommended regarding adjustment of systemic therapy.
FLUID ANALYSIS (sent to Chemistry):
Total Protein: 3.8 g/dL (elevated)
LDH: 285 U/L (elevated)
Serum-Ascites Albumin Gradient (SAAG): 0.8 g/dL (exudative)
Cell Count: 1,850 WBC/μL (elevated)
Findings consistent with malignant (exudative) ascites.
Cytopathologist: Dr. Elizabeth Morgan, MD
Board Certified Anatomic and Clinical Pathology
Date Signed: November 25, 2024