A 55-year-old married homemaker comes to your clinic, complaining of 6 months of vaginal itching and discomfort with intercourse. She has not had a discharge and has had no pain with urination. She has not had a period in over 2 years. She has no other symptoms. Her past medical history consists of removal of her gallbladder. She denies use of tobacco, alcohol, and illegal drugs. Her mother has breast cancer, and her father has coronary artery disease, high blood pressure, and Alzheimer's disease. On examination she appears healthy and has unremarkable vital signs. There is no lymphadenopathy with palpation of the inguinal nodes. Visualization of the vulva shows dry skin but no lesions or masses. The labia are somewhat smaller than usual. Speculum examination reveals scant discharge, and the vaginal walls are red, dry, and bleed easily. Bimanual examination is unremarkable. The KOH whiff test produces no unusual odor and there are no clue cells on the wet prep. What form of vaginitis is this patient most likely to have?

Correct Answer: D

Rationale: The patient's presentation is consistent with atrophic vaginitis, also known as vaginal atrophy. This condition typically occurs in postmenopausal women due to a decrease in estrogen levels, leading to thinning, drying, and inflammation of the vaginal walls. Symptoms of atrophic vaginitis include vaginal dryness, itching, discomfort with intercourse, and sometimes light bleeding after intercourse. The absence of vaginal discharge and the presence of vaginal dryness and bleeding easily upon examination suggest atrophic vaginitis as the most likely cause in this patient. Other causes of vaginitis such as Trichomonas vaginitis, Candida vaginitis, and bacterial vaginosis typically present with different symptoms and findings on examination.

Correct Answer: A

Rationale: The presence of a firm and immobile mass felt against the bowel wall during a rectal examination is concerning for a potential malignancy, such as colon cancer. Other conditions such as hemorrhoids or anal fissures are typically not associated with a mass that is firm and immobile. The "Valve of Houston" is a term that does not pertain to this scenario and is not a recognized medical entity. Therefore, the most likely diagnosis based on the given information is colon cancer, and further evaluation such as a colonoscopy would be warranted for definitive diagnosis and management.

Correct Answer: C

Rationale: The description of the patient's left shoulder pain, with a sharp catching pain and a sensation of something grating during overhead movements, in addition to tenderness just below the tip of the acromion in the area of tendon insertions, is suggestive of calcific tendinitis. Calcific tendinitis occurs when calcium deposits form within a tendon, most commonly affecting the rotator cuff tendons. This condition can cause pain, tenderness, and limited range of motion, particularly with certain movements like overhead reaching. The negative drop arm test, lack of limitation with shoulder shrug, absence of tenderness to palpation in the bicipital groove, and the patient not holding his arm close to his side help differentiate calcific tendinitis from other shoulder pathologies like rotator cuff tendinitis, rotator cuff tear, and bicipital tendinitis.

Correct Answer: A

Rationale: Rheumatoid arthritis is a systemic autoimmune disease that primarily affects the joints. It commonly presents with pain, swelling, and stiffness in multiple small joints such as those in the hands, wrists, and feet. It is more prevalent in females in their 30s to 50s. Rheumatoid arthritis is characterized by chronic inflammation of the synovial membrane, leading to joint damage and deformities over time. Laboratory tests showing elevated inflammatory markers, such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), along with positive rheumatoid factor and anti-cyclic citrullinated peptide (anti-CCP) antibodies, can help in confirming the diagnosis of rheumatoid arthritis.