肾血管平滑肌脂肪瘤：一种常见的肾良性肿瘤

最后更新： 2026年4月29日

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一种偶然发现的肾脏肿瘤，在我的泌尿科办公室很常见，医学上称为血管平滑肌脂肪瘤 (AML)。这种肿瘤大多是在健康促进诊所发现的，这让患者在第一次见到我时就非常担心。这就是我们今天要讨论的原因。

首先需要确认血管平滑肌脂肪瘤是肾良性肿瘤。有报道称一般人群为 0.2% – 0.6%，最常见于中年女性。他们的病因分为2类

1. Sporadic or happens by itself without any causes – 80% of cases.
2. Genetic-related diseases, tuberosclerosis (TSC) or pulmonary lymphangioleiomyomatosis (LAM) – 20% of cases.

Since the most of Angiomyolipoma is asymptomatic, around 85% of cases are always incidentally finding from medical check up imaging. On the other hand, 15% of cases will symptomatically present.

有症状的症状 血管平滑肌脂肪瘤

• 自发性肿瘤出血
• 可触及的侧腹肿块
• 腰腹痛
• 血尿
• 尿路感染

Diagnosis – Angiomyolipoma can be diagnosed by pure imaging modality since they have a unique composition which is “Fat” so once the imaging can detect renal tumor with fat component, AMLs will be a diagnosis.

1. Ultrasound – most common used modality. Pros: cheap, no radiation, widely accessible. Cons: operator dependent, less accurate for small AMLs.
2. Non-contrasted CT scan – Gold standard. Pros: definitive diagnosis. Cons: radiation exposure, expensive.
3. MRI – Alternative modality. Pros: accurate diagnosis. Cons: long scan time, expensive, contraindicated in metallic implanted patients.
4. Percutaneous biopsy – rarely used. Pros: tissue diagnosis. Cons: risk of hemorrhage.

Management options – There were confirmed literatures stating that less than 4 cm of AMLs can be reassured with no needing to do interventions. In contrast, if more than 4 cm AMLs have been reported, the possibility rupture event will increase. Treatment choices include active surveillance, embolization, surgery, and thermal ablation.

泌尿科医生必须让患者意识到的关键信息是 AML 是一种良性肿瘤，通常只需要主动监测程序。在极少数情况下需要干预。下个话题再见！

你可以感觉到文字 我 这里。

常见问题解答

Q1: Is angiomyolipoma of the kidney cancerous?

No. Angiomyolipoma (AML) is a benign (non-cancerous) kidney tumor. It is composed of fat, smooth muscle, and blood vessels, and is not malignant. However, larger AMLs carry a risk of spontaneous rupture and hemorrhage, which is why regular monitoring and sometimes intervention is recommended for tumors exceeding 4 cm in size.

Q2: What causes angiomyolipoma of the kidney?

In 80% of cases, angiomyolipoma occurs sporadically with no identifiable underlying cause. The remaining 20% are associated with genetic conditions, primarily tuberous sclerosis complex (TSC) or pulmonary lymphangioleiomyomatosis (LAM). AMLs are most commonly found in middle-aged women, though they can occur in both sexes.

Q3: When does angiomyolipoma need treatment?

AMLs smaller than 4 cm can generally be safely managed with active surveillance and regular imaging follow-up. Treatment becomes necessary when the tumor exceeds 4 cm, as larger AMLs carry a significantly higher risk of spontaneous rupture and life-threatening hemorrhage. Embolization is the preferred first-line minimally invasive treatment, with surgery reserved for cases suspicious of malignancy.

Q4: How is angiomyolipoma diagnosed?

AML can be diagnosed by imaging alone due to its characteristic fat content. Non-contrasted CT scan is the gold standard, as it can reliably detect fat within the tumor. Ultrasound is widely used at health check-up clinics as an initial screening tool, while MRI is an alternative for patients who cannot undergo CT. Percutaneous biopsy is rarely needed and reserved for atypical cases.

Q5: What symptoms does angiomyolipoma cause?

Approximately 85% of AMLs are asymptomatic and discovered incidentally during routine health check-up imaging. The remaining 15% may present with symptoms including flank pain, a palpable flank mass, bloody urination, urinary tract infection, or spontaneous tumor hemorrhage. Any new or worsening flank pain in a known AML patient should prompt urgent medical evaluation to rule out rupture.

If you have been told you have a kidney tumor or angiomyolipoma and would like a specialist assessment, Dr. Soarawee Weerasopone offers consultations at Bangkok Hospital Headquarters. 预约咨询.

**免责声明：** 本内容由曼谷医院总院的认证泌尿科医生 Soarawee Weerasopone 医生撰写和审阅。本内容仅用于教育目的，不构成医疗建议。在开始任何医疗治疗前，请务必咨询合格的医疗专业人士。.