13 January 2026
: Case report 
Gallbladder Agenesis in a Patient With Klinefelter Syndrome Presenting With Hematemesis and Right Upper-Quadrant Pain
Challenging differential diagnosis, Unusual or unexpected effect of treatment, Diagnostic / therapeutic accidents, Rare disease, Congenital defects / diseases, Educational Purpose (only if useful for a systematic review or synthesis), Rare coexistence of disease or pathology
Gurpreet Singh ACDEF 1, Jack Petroski ABEF 2*, Drake Marden BEF 1, Andrew Knauer ABEF 1DOI: 10.12659/AJCR.949945
Am J Case Rep 2026; 27:e949945
Figure 2 Magnetic resonance cholangiopancreatography revealed congenital absence of gallbladder and gallbladder fossa, with porta confluence indicated by a red arrow.