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Thymus recovery in tumour-bearing rats after tumour removal.

200 male Wistar rats were transplanted subcutaneously with Walker tumour. After 1 month, the tumour was surgically removed and, after an other 5 months, the histological pattern of the thymus of 12 rats which exhibited no recurrence, was studied. An almost complete recovery of the thymus of these animals was observed in comparison with controls of the same age. Some histological imprints of the transient involution undergone by the thymus during the first month, may be, nevertheless, identified.