Left atrial anomalous fibromuscular bands: a systematic review of case reports

Q: What is the clinical evidence from this study?

Study design: Systematic Review. Population: Left atrial anomalous fibromuscular bands (LAMB) (n=40).

Łukasz Piątek; Karolina Piątek; Jacek Kurzawski; Marianna Janion

doi:10.5114/ms.2026.160485

January 1, 2026Medical StudiesOpen Access

Left atrial anomalous fibromuscular bands: a systematic review of case reports

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Key result

Left atrial fibromuscular bands affect ~0.1% of the population, often remaining asymptomatic or causing severe MR.

n=40

Key Points

To systematically review published case reports on left atrial anomalous fibromuscular bands (LAMB) to clarify their anatomical characteristics, diagnostic approaches, and clinical consequences.
Conducted a systematic review of worldwide published case reports detailing patients diagnosed with left atrial muscular bands.
Extracted data regarding patient demographics, diagnostic imaging techniques (transthoracic echocardiography, transesophageal echocardiography, computed tomography, and magnetic resonance imaging), band insertion sites, associated pathologies, and interventions.
Patient age ranged from 18 to 85, with 16 patients aged below fifty and 8 individuals over seventy 5 years old.
The vast majority of bands originated from the interatrial septum near the fossa ovalis, most frequently attaching to the anterior mitral valve leaflet or the roof of the left atrium near a pulmonary vein orifice.
Transesophageal echocardiography provided definitive anatomical identification; while many cases presented incidentally during atrial fibrillation workups, individuals with severe mitral regurgitation successfully underwent surgical band resection or native valve-preserving repair.

Study Design

Type

Systematic Review (n=40)

Structured PICO

P

Population

40 adult patients with abnormal band structures in the left atrium (left atrial anomalous fibromuscular bands, LAMB) pooled from 32 case reports.

O

Outcome

Prevalence, anatomical location, clinical consequences, and treatment methods of left atrial anomalous fibromuscular bands.

Limitations

Knowledge about the anomaly is limited and comes solely from case reports.
The exact significance of LAMB as a potential cause of embolism remains uncertain.
Many cases may go undetected by standard transthoracic echocardiography.

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Implication

Left atrial anomalous fibromuscular bands are rare, mostly asymptomatic congenital anomalies that are increasingly detected by imaging and can occasionally cause severe mitral regurgitation requiring surgical intervention.

Abstract

ENW EndNote BIB JabRef, Mendeley RIS Papers, Reference Manager, RefWorks, Zotero AMA Piątek Ł, Piątek K, Kurzawski J, Janion M. Left atrial anomalous fibromuscular bands: a systematic review of case reports. Medical Studies/Studia Medyczne. 2026;42(1):7-11. doi:10.5114/ms.2026.160485. APA Piątek, Ł., Piątek, K., Kurzawski, J., & Janion, M. (2026). Left atrial anomalous fibromuscular bands: a systematic review of case reports. Medical Studies/Studia Medyczne, 42(1), 7-11. https://doi.org/10.5114/ms.2026.160485 Chicago Piątek, Łukasz, Karolina Piątek, Jacek Kurzawski, and Marianna Janion. 2026. "Left atrial anomalous fibromuscular bands: a systematic review of case reports". Medical Studies/Studia Medyczne 42 (1): 7-11. doi:10.5114/ms.2026.160485. Harvard Piątek, Ł., Piątek, K., Kurzawski, J., and Janion, M. (2026). Left atrial anomalous fibromuscular bands: a systematic review of case reports. Medical Studies/Studia Medyczne, 42(1), pp.7-11. https://doi.org/10.5114/ms.2026.160485 MLA Piątek, Łukasz et al. "Left atrial anomalous fibromuscular bands: a systematic review of case reports." Medical Studies/Studia Medyczne, vol. 42, no. 1, 2026, pp. 7-11. doi:10.5114/ms.2026.160485. Vancouver Piątek Ł, Piątek K, Kurzawski J, Janion M. Left atrial anomalous fibromuscular bands: a systematic review of case reports. Medical Studies/Studia Medyczne. 2026;42(1):7-11. doi:10.5114/ms.2026.160485.

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Cite This Study

Piątek et al. (2026) conducted a systematic review in Left atrial anomalous fibromuscular bands (LAMB) (n=40). Left atrial fibromuscular bands are a rare anomaly with an estimated prevalence of 0.02% to 0.1% in the general population, often presenting asymptomatically or causing severe mitral valve regurgitation.

synapsesocial.com/papers/6a025e8b93868c48f3093dd2 https://doi.org/10.5114/ms.2026.160485

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Left atrial anomalous fibromuscular bands: a systematic review of case reports

Key Points

Study Design

Structured PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

Left atrial anomalous fibromuscular bands: a systematic review of case reports

Key Points

Study Design

Structured PICO

Limitations

Ask about this paper

Implication

Abstract

Discussion

Cite This Study

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