The pyramidal lobe (PL) is a vestige of the embryonic thyroglossal duct and descends along with developing thyroid gland from the posterior third of the tongue to its ultimate position in the neck . PL can be delineated with ease using pinhole-collimator gamma camera imaging.5eeking the incidence and morphological characteristics of PL, we reviewed 200 consecutive cases of thyroid scintigrams performed during 2 years from March 1979 at the Department of Radiology , 5t. Mary'5 Hospital , Catholic Medica l College, 5eoul, Korea.There were 12 males and 188 females and the age ranged from 9 to 69 years. The scintigrams were either normal or d iffusely goitrous. Those with cold or hot nodules and poor images were not included.The results were as follows -1 . The incidence of PL was 104 (52 %) out of 200 cases , and PL was located in the left lobe of the gland in 50 (48. 1%), in the isthmus portion in 33 (3 1.7%) and in the right lobe in 21 (20 %). 2.PL was rod shaped in 57 cases (54.8 %), triangular or cone shaped in 42 (40.0 %) and dumbbell or club shaped in 5 (4.8 %). 3.The length of PL was 1 to 2 cm in 44 cases (42.3 %), 2 to 3 cm in 36 (34.6 %) and lessthan 1 cm in 11 (10 .4%) and more than 3 cm in 1 3 (12 .5 %). The width of PL was 0 .5 to 1 cm in 78 cases (75 %), less than 0.5 cm in 12 (11.5 %) and more than 1 cm in 14 (13.5 %). 4.To evaluate the histopathologic relationship between the thyroid gland proper and PL , we measured the length of PL in 54 cases of normal group and in 21 cases with diffuse goiter , retrospectively.The mean and strandard deviation in the former was 1.64 :t 0.66 cm and in the latter 1.77 :t 0 .6 7cm.The d ifference between the normal and goitrous group was not significant statistically suggesting that the biological behaviour of PL is probably parallel to that of the thyroid gland proper.

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Although the uselulness 01 mammography as a screening test lor breast cancer is still in dispute, its use to patients over 50 years 01 age is va lid Since Wolfe lirst classilied the breast parenchymal patterns 01 mammography into 4 patterns, many authors have adopted the criteria in studying the changes 01 the parenchymal patterns lor ce rtain ages and the risks lor breast cancer 01 certain parenchyma l patterns Authors reviewed 49 cases 01 breast masses which diagnosed by mammography and by operation during the period Irom January 1978 to J 미 Y 1983 at St. Mary'5 Hospital, Catholic Medical College.Th e parenchymal tissu e patterns were classiled according to Wolle into NI, P1 , P2 and DY. Risk groups we re classilied into low risk group (N1 , P1) and high group (P2, DY)On the basis 01 these criteria, benign and malignant disease we re analyzed against the breast parenchymal patterns Th e results and concl usions we re as lollows:1. Age ranged Irom 16 years to 67 yea rs with the most prevalent age being 4th and 5th decades 2. Diagnoses we re: libroadenoma 17 cases, l ibrous dysplasia 16 cases, ductal papilloma 3 cases, and can ce r 13 cases 3. Categorization 01 those 26 benign diseases according to the Wolle's criteria was' N1 6 cases, P1 10 cases, P2 9 cases and DY 11 cases. On the other hand, categorization 01 13 cas es 01 cance r was: N1 5 cas es,