An 11-month-old infant was evaluated for gradually enlarging localized swellings over the left side of the chest, present since birth. The perinatal, developmental and family history were unremarkable. Cutaneous examination revealed two well-defined porcelain white-colored, plate-like hard, subcutaneous swellings over the left upper lateral chest wall, measuring 15×20 mm and 5×10 mm (Fig. 1). The swellings were non-tender, free from underlying structures and without any visible discharge. There was no clinical evidence of rickets. Serum and urinary levels of calcium and phosphorus, and serum parathyroid hormone levels were normal. A chest radiograph revealed two prominent spicules of calcification in the soft tissue of left lateral chest wall at the level of 10th rib. A diagnosis of congenital plate-like osteoma cutis was confirmed on excisional biopsy that revealed dermal ossification with multiple osteocytes (Fig. 2).

Fig. 1 Porcelain white-colored, plate-like, subcutaneous swellings over the left upper lateral chest wall.	Fig. 2 Dermal ossification with multiple osteocytes in oval-shaped lacunae (hematoxylin & Eosin, 400×).