Differential Diagnosis
- Single most likely diagnosis
- Renal colic due to the non-obstructing right renal calculus: This is the most likely diagnosis given the patient's history of obstructing stone and the current finding of a pinpoint non-obstructing right renal calculus.
- Other Likely diagnoses
- Diverticulitis: Although the calcification adjacent to the sigmoid colon is unchanged from the prior study and represents a calcified or inspissated contrast within a diverticulum, the patient could still be experiencing diverticulitis, especially if the diverticulum is inflamed.
- Degenerative joint disease: The mild degenerative changes in the osseous structures could be causing the patient's symptoms, especially if the patient is experiencing back or pelvic pain.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Appendicitis: Although the CT scan shows no evidence of acute appendicitis, this diagnosis should not be missed as it can be life-threatening if not treated promptly.
- Vasculitis: The CT scan shows no evidence of acute vasculitis, but this diagnosis should be considered as it can be deadly if not treated promptly.
- Bowel obstruction: Although the CT scan shows no evidence of obstruction or bowel wall thickening, this diagnosis should not be missed as it can be life-threatening if not treated promptly.
- Rare diagnoses
- Renal cell carcinoma: Although the kidneys reveal no renal mass, renal cell carcinoma is a rare but possible diagnosis that should be considered, especially if the patient has a history of kidney problems.
- Lymphoma: Although there are no abnormal masses or lymphadenopathy, lymphoma is a rare but possible diagnosis that should be considered, especially if the patient has a history of cancer.