A Curious "Mickey Mouse" Sign: Physiological FAPI Uptake in Uterus Didelphys on 68Ga-FAPI PET/CT.

Authors

Sharjeel Usmani, Khulood Al Riyami, Aisha Ismaila, Anjali Jain, Asiya Al Busaidi, Subash Chand Kheruka

Published in

Clinical nuclear medicine. Jun 15, 2026. Epub Jun 15, 2026.

Abstract

A 42-year-old woman with invasive lobular carcinoma of the left breast underwent staging with 68Ga-FAPI PET/CT, which demonstrated intense uptake in the primary breast lesion and ipsilateral nodal metastases. Incidentally, symmetric intense pelvic tracer uptake was identified, corresponding on fused PET/CT to 2 distinct uterine horns consistent with uterus didelphys. The characteristic bilateral rounded appearance on PET images produced a striking "Mickey Mouse" sign, reflecting physiological FAPI accumulation within duplicated uterine stromal tissue. Subsequent ultrasonography confirmed uterus didelphys with normal endometrial and myometrial morphology. Recognition of physiological FAPI uptake patterns in congenital Müllerian anomalies is essential to avoid misinterpretation as pelvic metastatic disease.

PMID:
42341200
Bibliographic data and abstract were imported from PubMed on 25 Jun 2026.

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