Lymphadenopathy CT scan

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Amandeep Singh M.D.[2]

Overview

[Location] CT scan may be helpful in the diagnosis of [disease name]. Findings on CT scan suggestive of/diagnostic of [disease name] include [finding 1], [finding 2], and [finding 3].

OR

There are no CT scan findings associated with [disease name]. However, a CT scan may be helpful in the diagnosis of complications of [disease name], which include [complication 1], [complication 2], and [complication 3].

CT scan

• On CT, characteristic findings of lymphadenopathy, include:

• Most nodes: 10 mm in short-axis
• Sub-mental and sub-mandibular: 15 mm
• Retropharyngeal: 8 mm
• Loss of fatty hilum
• Focal necrosis
• Cystic necrotic nodes
• Long-to-short axis ratio (>2cm - usually benign)

• The upper limit in size of a normal node varies with location.

[Location] CT scan may be helpful in the diagnosis of [disease name]. Findings on CT scan suggestive of/diagnostic of [disease name] include:

• [Finding 1]

PET/CT

• On PET/CT, lymphadenopathy can be further assessed via quantitation of FDG uptake, which is a surrogate of metabolic activity. Infectious, inflammatory, and neoplastic processes will show high FDG avidity on PET/CT. PET/CT is particularly useful for assessing response of lymph nodes to systemic chemotherapy.