Here are some most common sites of involvment of some diseases:
Gall stone ileus
Colonic diverticula(descending colon,sigmoid colon)
polyps in Puetz-Jegher syndrome
pneumatoses cystoids intestinalis
most common site of obstruction in meconium ileus-distal ileum
most common site of obstruction in meconium plug syndrome-transverse colon
most common site of bleeding in angiodysplasia-right colon
most common site of parathyroid adenoma-inferior parathyroid lobes
most common site of parathyroid hyperplasia-all four lobes equally involved
most common site of pancreas involved in insulinoma-uniformly distributed throughout the pancreas.
most frequent site of dialysis related amyloidosis-femoral neck
most common site of involvment in osteitis fibrosa cystica-Ribs
Excellent Work Akanksha!