NK-Cell Lymphomas of the Head and Neck Workup
- Author: Benjamin Daniel Liess, MD; Chief Editor: Arlen D Meyers, MD, MBA more...
Laboratory Studies
- The following laboratory studies should be performed:
- CBC count: A CBC count may reveal anemia or lymphocytopenia.
- Liver function tests including assessment of lactic dehydrogenase (LDH) levels: Elevated levels of LDH have been associated with poorer prognosis; these levels should be checked in every patient.
- Renal function tests
- Uric acid and calcium levels
- EBV titers
Imaging Studies
- CT scanning of neck, chest, abdomen, and pelvis are indicated. Imaging studies are obtained to determine the full extent of disease for staging purposes. Neck CT scanning is important to detect skull base erosion and intracranial extension.[2, 3]
- MRI of the head is performed in cases of suspected skull base invasion and intracranial extension.[2, 3]
Procedures
- The following procedures should be performed:
- Flexible nasopharyngoscopy with direct laryngoscopy to characterize the extent of lesion.
- Biopsy of primary site to characterize morphology and to allow genetic studies, immunohistochemical studies, and genetic (EBV) studies. Multiple large biopsies should be taken to provide adequate tissue for diagnosis. However, repeated biopsy may be necessary if too much necrosis is present.
- Bone marrow biopsy to assess for disseminated disease.
- Lumbar puncture to determine if intrathecal chemotherapy is indicated.
Histologic Findings
The histologic features of NK-/T-cell lymphomas are similar at all sites of presentation. Morphologically, these malignancies demonstrate a broad cytologic spectrum. Size can include atypical cells that are small, medium, or large. Cells most commonly are medium-sized with irregular nuclei, granular chromatin, small nucleoli, and pale-to-clear cytoplasm. An inflammatory cell infiltrate may be observed and is most common with small-cell tumors. The infiltrate can include lymphocytes, plasma cells, histiocytes, and eosinophils, which explains the term polymorphic reticulosis in former classifications of these malignancies.
Atypical malignant cells possess moderate pale cytoplasm with azurophilic granules. Necrosis is almost always present along with evidence of angioinvasion, indicating a vascular pathogenesis (hence the name angiocentric lymphoma in previous classifications). Florid pseudoepitheliomatous hyperplasia may also be present and may lead to the misdiagnosis of squamous cell carcinoma.[1, 4, 5, 6, 7]
Immunophenotypical tests demonstrate the following patterns in detection of these malignancies. The most commonly present cell markers are CD2+, cytoplasmic CD3e+, and CD56+. Other markers that may be present include CD7, CD30, CD43, CD45RO, HLA-DR, interleukin-2 receptor, Fas (CD95), and Fas ligand. The following markers are known to be associated with NK cells and T cells but are not found in NK-/T-cell lymphomas: surface CD3, CD4, CD5, CD8, TCRg, TCRd, CD16, CD 20, and CD57.[8, 9, 3, 10, 4] Immunohistochemical testing of surface CD3-, cytoplasmic CD3e+, and CD56+ differentiate NKTCL from peripheral T-cell lymphoma.
Genetic tests find EBV in most tumor cells. The virus is found in a clonal episomal form. In most cases, T-cell receptor and immunoglobulin genes are in germline configuration. Various genetic abnormalities have been identified with the malignancies, but no specific chromosomal translocations have been identified.[3, 9]
Staging
The Ann Arbor Classification stages NK-/T-cell lymphoma as follows:
- Stage I - Involvement in a single lymph node region or single extralymphatic site
- Stage II - Involvement of 2 or more lymph node regions on the same side of diaphragm, localized contiguous involvement of only one extralymphatic site and lymph node region
- Stage III - Involvement of lymph node regions on both sides of diaphragm; may include spleen
- Stage IV - Disseminated involvement of one or more extralymphatic organs with or without lymph node involvement
The addition of the letter E denotes extralymphatic sites. The letter B indicates the presence of B symptoms (ie, fever, night sweats, or weight loss).
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