Giant ovarian dermoid masked by obesity.

A 37-year-old female, weighing 194.1 kg, is described. Her gross obesity was in part due to a massive ovarian dermoid cyst weighing at least 42 kg, which had been overlooked in the past. A dermoid tumour of this size has not previously been reported. The possible presence of cystic ovarian tumours should be considered in patients presenting with severe generalized obesity.