Home ยป What is the cutoff dimension for a solitary pulmonary nodule (SPN)? Cancer MCQs What is the cutoff dimension for a solitary pulmonary nodule (SPN)? January 11, 2022 6 Views Q. What is the cutoff dimension for a solitary pulmonary nodule (SPN)? A. < 3 mm B. < 3 cm C. < 5 mm D. < 5 cm Answer: < 3 cm