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The scattering of time‐harmonic spherical acoustic waves by a penetrable sphere with statistically irregular surface has been studied. The first and the second moments of the potential fields are computed. The asymptotic expressions of the moments of the fields for a small corrugated sphere are also derived. For the purpose of illustration, a simple example, a small corrugated sphere of radius, a, with its mean surface defined by 〈r〉 = a(1 + e sinθ + e cosθ sinφ), is considered and the far field scattering amplitude of its second moment is calculated and plotted.

Chromosome 22q11.2 deletion syndrome is the most common interstitial deletion syndrome. Major clinical manifestation includes hypocalcemia secondary to hypoparathyroidim. At least 10% of the patients with this syndrome had hypocalcemic seizures which are generally improved over the first year of life because of the increase of parathyroid gland hypertrophy and dietary calcium intake. We present two cases of this syndrome diagnosed in 12-year-old boys with new onset hypocalcemic seizures. This case report hopes to call attention to this syndrome as a potential cause of hypocalcemic seizures even after the neonatal period. Furthermore, our first patient showed inheritance from a paternal deletion which is not as common as maternal deletions. This is the first case report of hypocalcemic seizure with a paternally inherited 22q11.2 deletion in Korea.