Papillary Thyroid Carcinoma, Cushing Disease, and Adrenocortical Carcinoma in a Patient with Li-Fraumeni Syndrome.

Background/Objective: Li-Fraumeni syndrome (LFS) is an inherited sequence variant in TP53 characterized by the early onset of various core malignancies including adrenocortical carcinoma (ACC), sarcomas, breast cancer, leukemias, and central nervous system tumors. We present a case of a patient with LFS who developed endocrine neoplasms not classically seen in LFS in addition to developing ACC. Case Report: A 26-year-old nonbinary individual assigned female at birth with a history of LFS complicated by osteosarcoma of the jaw was incidentally found to have thyroid and sellar masses on surveillance magnetic resonance imaging. Fine-needle aspiration of thyroid mass confirmed papillary thyroid carcinoma, and the patient underwent total thyroidectomy. Pituitary workup was notable for laboratory test results consistent with adrenocorticotropic hormone-dependent hypercortisolism; the patient underwent resection of the pituitary lesion. The patient was subsequently noted on abdominal imaging to have a new left adrenal mass; they underwent left adrenalectomy with pathology consistent with ACC. Discussion: There is limited literature on the relationship between LFS and thyroid and pituitary neoplasms. Genetic testing has suggested that TP53 sequence variants may play a role in tumorigenesis in thyroid and pituitary neoplasms; however, most of the current literature is based on evidence of somatic rather than germline sequence variants. Conclusion: This case highlights a patient with LFS with neoplasia of multiple endocrine organs including ACC, which is a classic finding, as well as papillary thyroid carcinoma and Cushing disease. Further investigation may be necessary to assess if patients with LFS are at a higher risk of various endocrine neoplasms in addition to the core malignancies classically described because this could affect future screening protocols.