Lymphoblastic lymphoma, nodes of axilla and upper limb

This code signifies a diagnosis of lymphoblastic lymphoma, a highly aggressive non-Hodgkin lymphoma, specifically affecting the lymph nodes located in the axilla and/or upper limb. This malignancy originates from immature lymphoid cells (lymphoblasts) and is characterized by its diffuse growth pattern within the affected lymph nodes.

Apply this code when documentation confirms a pathological diagnosis of lymphoblastic lymphoma with primary or metastatic involvement of the axillary or upper limb lymph nodes. This includes cases where biopsy results, imaging (e.g., PET/CT), and clinical findings collectively indicate this specific site of disease.

• Ensure the pathology report explicitly states "lymphoblastic lymphoma" and specifies involvement of axillary or upper limb lymph nodes.
• Distinguish from other types of non-Hodgkin lymphoma affecting these sites; the "lymphoblastic" morphology is key.
• Code additional sites of involvement with appropriate secondary malignancy codes if documented.