A patient with the basal cell nevus syndrome is reported in whom the cutaneous lesions were sharply limited to the light exposed areas of the left half of the face, neck, upper part of the trunk, and the external aspect of the left arm. A solitary dental cyst was also found to be on the left side of the mandible. Although calcium deposition in the skin tumor was remarkable, no systemic abnormalities of calcium metabolism could be detected. The tissue calcification would appear dependent on local factors.
Shelley WB, Rawnsley HM, Beerman H. Quadrant Distribution of Basal Cell Nevi. Arch Dermatol. 1969;100(6):741-743. doi:10.1001/archderm.1969.01610300091016