Kidney CT Appearances

Mixed Epithelial Stromal Tumor (MEST) CT Findings

• Unilateral, solid kidney lesions
• Well-demarcated tumor
• Complex cystic lesions (Bosniak III or IV) with solid components
• Contrast enhancement

Other Information About Mixed Epithelial Stromal Tumors (MEST)

Etiology:

• Unknown
• May be linked to hormonal therapy

Epidemiology:

• Rare
• Male to female ratio is 1:10
• Typically presents during 5th decade of life or perimenopausal age

Presentation:

• Typically asymptomatic and discovered incidentally
• Hematuria
• Abdominal pain
• Palpable mass
• Frequent UTIs

Prognosis:

• MEST tumors are benign

Related Pearls: MEST