Exploring Levator Palpebrae Superioris Myositis: A Rare Cause of Ptosis.

Ptosis may indicate an underlying serious condition; therefore, careful evaluation and identification of its cause are essential. It can result from various etiologies, presenting as either unilateral or bilateral eyelid drooping. Levator palpebrae superioris (LPS) myositis is a rare inflammatory disorder involving the eyelid-elevating muscle. While orbital myositis commonly affects extraocular muscles, such as the medial rectus, isolated LPS involvement is uncommon. We present the case of a 47-year-old woman who developed isolated unilateral ptosis and was diagnosed with LPS myositis. The report highlights the typical clinical presentation, diagnostic approach, and management strategies for this unusual condition. Recognition of this rare entity is important, as prompt diagnosis and appropriate therapy can lead to complete recovery and prevent unnecessary interventions. This report emphasizes the importance of considering LPS myositis in patients with isolated ptosis, demonstrates the value of orbital imaging for diagnosis, and illustrates that timely corticosteroid therapy can lead to complete recovery. Recognition of this rare condition can prevent misdiagnosis and unnecessary interventions.