<p>Pneumosinus dilatans (PSD) is a rare condition characterized by the enlargement of the paranasal sinus, predominantly the frontal sinus. The cause of PSD is uncertain, and its etiology is contested and not well established, as it develops without signs of bone resorption or pathological changes to the underlying mucosa. Meningioma is a common type of brain tumor that is generally non-malignant and arises from the membranous layers (meninges) surrounding the brain or the spinal cord. Here, we present a case of a patient who was diagnosed with grade 1 meningioma and exhibited dilation of the paranasal sinuses. This case emphasizes the need to comprehend the association between PSD of spheno-ethmoidal sinus and frontobasal meningioma. This could help develop new insights into treatment options and derive the benefits of early diagnosis.</p>