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ROBERT W. JAMPLIS, M.D.; FRANCIS S. NORTH, M.D.; WILLIAM D. JOHNSON, M.D.

AMA Arch Surg. 1961;83(6):894-897.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

We present a case of a tumor in the oblique fissure of the right lung which presented histological characteristics that made difficult differentiation between thymoma and benign hyperplasia of a lymph node. Because ectopia of thymic tumors is rare, attention is called to the occurrence of lymph nodes which can lead to diagnostic confusion, a matter of importance, in view of the difference in prognosis.

If thymoma is defined as a tumor of the thymus gland composed always of lymphocytes and reticulum cells in varying proportion, it becomes an entity whose behavior is definite and predictable.^2,13 One of its characteristics is spreading by direct invasion rather than by embolization via the blood and lymph streams, much in the manner of basal-cell carcinoma of the skin.¹⁰ Thus, when tissue resembling a thymoma is found in locations other than the anterior mediastimum its origin becomes a matter for speculation. While . . . [Full Text PDF of this Article]

Author Affiliations
PALO ALTO, CALIF.

Sections of Surgery, Chest Diseases, and Pathology, Palo Alto Medical Clinic.

Footnotes
Received for publication July 7, 1961

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