Differential Diagnosis for 84 y/o Female with Pain in Lateral Foot and into Pinky Toe

• Single Most Likely Diagnosis
  • Morton's neuroma: This condition is a common cause of pain in the ball of the foot, often radiating into the toes, especially the fourth and fifth toes. The patient's age and the location of the pain make this a likely diagnosis.
• Other Likely Diagnoses
  • Bunionette (tailor's bunion): A bony growth on the outside of the foot, at the base of the little toe, can cause pain and discomfort in the lateral foot and into the pinky toe.
  • Plantar fasciitis: Although more commonly associated with heel pain, plantar fasciitis can cause pain along the bottom of the foot, potentially radiating into the toes.
  • Arthritis (osteoarthritis or rheumatoid arthritis): These conditions can cause pain and stiffness in the joints of the foot, including those in the lateral foot and toes.
• Do Not Miss Diagnoses
  • Deep vein thrombosis (DVT): Although less common in the foot, DVT can cause pain and swelling, and it is crucial to rule out this potentially life-threatening condition.
  • Cellulitis or abscess: Infections in the foot can cause significant pain and require prompt treatment to prevent serious complications.
  • Peripheral artery disease (PAD): Reduced blood flow to the feet can cause pain, especially in older adults, and is essential to diagnose to prevent further complications.
• Rare Diagnoses
  • Tarsal tunnel syndrome: Similar to carpal tunnel syndrome but affecting the nerves in the foot, this condition can cause pain, numbness, and tingling in the foot and toes.
  • Ganglion cyst: A non-cancerous lump that can develop on the foot, potentially causing pain and discomfort.
  • Charcot foot: A condition that can cause the joints in the foot to collapse, leading to severe pain and deformity, often seen in patients with diabetes or nerve damage.