# Fluorodeoxyglucose (FDG) Uptake in the Remnant Adrenal Gland Mimicking Tumor Recurrence in a Patient With Adrenocortical Carcinoma After Treatment With Mitotane

## TL;DR

A patient with adrenocortical carcinoma showed increased FDG uptake in the remnant adrenal gland, which was later found to be due to mitotane treatment, not tumor recurrence.

## Contribution

The paper highlights that FDG uptake in the remnant adrenal gland during mitotane treatment may not indicate tumor recurrence.

## Key findings

- Increased FDG uptake in the remnant adrenal gland was observed in a patient with ACC after mitotane treatment.
- The FDG uptake resolved after discontinuation of mitotane, suggesting a treatment-related effect.
- The case emphasizes the need to consider treatment effects when interpreting FDG PET scans in ACC patients.

## Abstract

Adrenocortical carcinoma (ACC) is a rare malignancy with poor prognosis. Its diagnosis requires clinical suspicion and confirmation through laboratory and imaging studies, including computed tomography (CT), magnetic resonance imaging (MRI), and abdominal ultrasound, as well as histological confirmation. Positron emission tomography (PET) is useful for distinguishing between benign and malignant lesions and for evaluating tumor recurrences or metastases. A case is described in which the uptake of fluorodeoxyglucose (18F-FDG) in a remnant adrenal gland could be misinterpreted as tumoral pathology. The article presents the case of a patient with ACC who, after treatment, showed increased FDG uptake in the remnant adrenal gland, which disappeared after discontinuation of treatment with mitotane. Possible explanations for this increase in FDG uptake are discussed, including the action of mitotane. In summary, it is highlighted that FDG uptake in remnant adrenal glands in patients treated with mitotane does not always indicate tumor recurrence or adrenal hypertrophy.