Carcinoma of unknown primary origin with isolated adrenal metastasis: A report of two cases

Mitsuhiro Kometani, Takashi Yoneda, Yuji Maeda, Koushiro Ohtsubo, Yuto Yamazaki, Hiroko Ikeda, Shunsuke Mori, Daisuke Aono, Shigehiro Karashima, Mikiya Usukura, Hironobu Sasano, Yoshiyu Takeda

Research output: Contribution to journalArticlepeer-review

Abstract

The adrenal glands are one of the most common sites of malignant tumor metastasis. However, metastatic adrenal carcinoma of unknown primary origin with localized adrenal gland involvement is an extremely rare condition. Herein, we reported two cases of carcinoma of unknown primary origin with isolated adrenal metastasis. In the first case, back pain was the trigger; while in the second case, the triggers were low fever and weight loss. Metabolic abnormalities such as hypertension and obesity were not detected in either case. Neither patient had relevant previous medical histories, including malignancy. However, both had a long-term history of smoking. Systemic imaging studies revealed only adrenal tumors and surrounding lesions. Primary adrenocortical carcinoma was initially suspected, and chemotherapy including mitotane was considered. However, due to difficulty in complete resection of the tumor, core needle tumor biopsies were performed. Histopathological examination of biopsy specimens led to the diagnosis of carcinoma of unknown primary origin with isolated adrenal metastasis. In both cases, additional laboratory testing showed high levels of serum squamous cell carcinoma-related antigen and serum cytokeratin fragment. Malignant lesions confined to the adrenal glands are rare. As in our cases, it could be occasionally difficult to differentiate non-functioning primary adrenocortical carcinoma from metastatic adrenal carcinoma of unknown primary origin localized to the adrenal gland. If the lesion is unresectable and there are elevated levels of several tumor markers with no apparent hormonal excess, core needle tumor biopsy should be considered to differentiate the primary tumor from the metastatic tumor.

Original languageEnglish
Pages (from-to)1209-1215
Number of pages7
Journalendocrine journal
Volume68
Issue number10
DOIs
Publication statusPublished - 2021

Keywords

  • Adrenal metastasis
  • Carcinoma of unknown primary origin
  • Tumor biopsy

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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